Here is a list of every professional (MLB, MiLB & independent) and collegiate summer baseball team in Canada & the United States. I may have missed some minor collegiate league as I used the list from Collegiate Summer Baseball to include these leagues. That site follows the top 31 leagues in North America.
This list is current as of the 2016 season. There have already been some changes as the California League’s Bakersfield and High Dessert teams have folded in favor of an expanded Carolina League (High A classification). Other teams have either relocated (Florida State League’s Brevard County to Kissimmee) or changed names (WMBL’s Swift Current Indians are having a rename the team contest.
| Team | Level | League | State/Prov |
| Aberdeen IronBirds | Class A Short | New York-Penn | MD |
| Academy Barons | Summer College | California Collegiate | CA |
| Acadiana Cane Cutters | Summer College | Texas Collegiate | LA |
| Adirondack Trail Blazers | Summer College | PGCBL | NY |
| Akron RubberDucks | Double-A | Eastern | OH |
| Alaska Goldpanners of Fairbanks | Summer College | Independent | AK |
| Albany Dutchmen | Summer College | PGCBL | NY |
| Albuquerque Isotopes | Triple-A | Pacific Coast | NM |
| Alexandria Aces | Summer College | Cal Ripken | VA |
| Allentown Railers | Summer College | Atlantic Collegiate | PA |
| Alpharetta Braves | Summer College | Sunbelt | GA |
| Alpine Cowboys | Independent | Pecos | TX |
| Altamonte Springs Boom | Summer College | Florida Collegiate | FL |
| Alton Pioneers | Summer College | Lewis & Clark | MO |
| Altoona Curve | Double-A | Eastern | PA |
| Amsterdam Mohawks | Summer College | PGCBL | NY |
| Anchorage Bucks | Summer College | Alaska | AK |
| Anchorage Glacier Pilots | Summer College | Alaska | AK |
| Arizona Diamondbacks | Majors | National League | AZ |
| Arkansas Travelers | Double-A | Texas | AR |
| Arroyo Seco Saints | Summer College | Sunset | CA |
| Arvada Colts | Summer College | Rocky Mountain | CO |
| Asheboro Copperheads | Summer College | Coastal Plain | NC |
| Asheville Tourists | Class A | South Atlantic | NC |
| Atlanta Braves | Majors | National League | GA |
| Atlanta Crackers | Summer College | Sunbelt | GA |
| Atwater Aviators | Summer College | Golden State | CA |
| Auburn Doubledays | Class A Short | New York-Penn | NY |
| Augusta GreenJackets | Class A | South Atlantic | GA |
| Bakersfield Blaze | Class A Advanced | California | CA |
| Baldwin City Blues | Summer College | Mid-Plains | KS |
| Baltimore Dodgers | Summer College | Cal Ripken | MD |
| Baltimore Orioles | Majors | American League | MD |
| Baltimore Redbirds | Summer College | Cal Ripken | MD |
| Batavia Muckdogs | Class A Short | New York-Penn | NY |
| Battle Creek Bombers | Summer College | Northwoods | MI |
| Belleville Explorers | Summer College | Lewis & Clark | MO |
| Bellingham Bells | Summer College | West Coast | WA |
| Beloit Snappers | Class A | Midwest | WI |
| Bend Elks | Summer College | West Coast | OR |
| Bethany Bulls | Summer College | Jayhawk | OK |
| Bethesda Big Train | Summer College | Cal Ripken | MD |
| Billings Mustangs | Rookie | Pioneer | MT |
| Biloxi Shuckers | Double-A | Southern | MS |
| Binghamton Mets | Double-A | Eastern | NY |
| Birmingham Barons | Double-A | Southern | AL |
| Birmingham Bloomfield Beavers | Independent | United Shore | MI |
| Black Bears | Summer College | Rocky Mountain | CO |
| Bluefield Blue Jays | Rookie | Appalachian | WV |
| Boca Raton Blazers | Summer College | South Florida | FL |
| Boise Hawks | Class A Short | Northwest | ID |
| Boston Red Sox | Majors | American League | MA |
| Boulder Collegians | Summer College | Rocky Mountain | CO |
| Bourne Braves | Summer College | Cape Cod | MA |
| Bowie Baysox | Double-A | Eastern | MD |
| Bowling Green Hot Rods | Class A | Midwest | KY |
| Bradenton Marauders | Class A Advanced | Florida State | FL |
| Branson Nationals | Summer College | MINK | MO |
| Brazos Valley Bombers | Summer College | Texas Collegiate | TX |
| Brevard County Manatees | Class A Advanced | Florida State | FL |
| Brewster Whitecaps | Summer College | Cape Cod | MA |
| Bridgeport Bluefish | Independent | Atlantic | CT |
| Bristol Blues | Summer College | Futures Collegiate | CT |
| Bristol Pirates | Rookie | Appalachian | VA |
| Brockton Rox | Summer College | Futures Collegiate | MA |
| Brookhaven Bucks | Summer College | Sunbelt | GA |
| Brooks Bombers | Summer College | Western Major | AB |
| Brooklyn Cyclones | Class A Short | New York-Penn | NY |
| Buffalo Bisons | Triple-A | International | NY |
| Burlington Bees | Class A | Midwest | IA |
| Burlington Royals | Rookie | Appalachian | NC |
| Butler Blue Sox | Summer College | Prospect | PA |
| California Bees | Summer College | Golden State | CA |
| Carolina Mudcats | Class A Advanced | Carolina | NC |
| Carolina Pirates | Summer College | Carolina-Virginia | NC |
| Carolina Vipers | Summer College | Southern Collegiate | NC |
| Carrollton Clippers | Summer College | Sunbelt | GA |
| Catawba Valley Stars | Summer College | Carolina-Virginia | NC |
| Cedar Rapids Kernels | Class A | Midwest | IA |
| Champion City Kings | Summer College | Prospect | OH |
| Charleston RiverDogs | Class A | South Atlantic | SC |
| Charlotte Crushers | Summer College | Carolina-Virginia | NC |
| Charlotte Knights | Triple-A | International | NC |
| Charlotte Stone Crabs | Class A Advanced | Florida State | FL |
| Charlottesville TomSox | Summer College | Valley | VA |
| Chatham Anglers | Summer College | Cape Cod | MA |
| Chattanooga Lookouts | Double-A | Southern | TN |
| Chicago Cubs | Majors | National League | IL |
| Chicago White Sox | Majors | American League | IL |
| Chico Heat | Summer College | Great West | CA |
| Chillicothe Mudcats | Summer College | MINK | MO |
| Chillicothe Paints | Summer College | Prospect | OH |
| Chugiak Chinooks | Summer College | Alaska | AK |
| Cincinnati Reds | Majors | National League | OH |
| Cincinnati Steam | Summer College | Great Lakes | OH |
| Clarinda A’s | Summer College | MINK | IA |
| Clearwater Threshers | Class A Advanced | Florida State | FL |
| Cleveland Indians | Majors | American League | OH |
| Clinton LumberKings | Class A | Midwest | IA |
| Colorado Pirates | Summer College | Rocky Mountain | CO |
| Colorado Rockies | Majors | National League | CO |
| Colorado Sox | Summer College | Rocky Mountain | CO |
| Colorado Springs Sky Sox | Triple-A | Pacific Coast | CO |
| Columbia Fireflies | Class A | South Atlantic | SC |
| Columbus Clippers | Triple-A | International | OH |
| Concord Weavers | Summer College | Southern Collegiate | NC |
| Conejo Oaks | Summer College | California Collegiate | CA |
| Connecticut Tigers | Class A Short | New York-Penn | CT |
| Coral Springs Royals | Summer College | South Florida | FL |
| Corpus Christi Hooks | Double-A | Texas | TX |
| Corvallis Knights | Summer College | West Coast | OR |
| Cotuit Kettleers | Summer College | Cape Cod | MA |
| Courtland Crush | Summer College | NYCBL | NY |
| Covington Lumberjacks | Summer College | Valley | VA |
| Cowlitz Black Bears | Summer College | West Coast | WA |
| Danbury Westerners | Summer College | NECBL | CT |
| Danville Braves | Rookie | Appalachian | VA |
| Danville Dans | Summer College | Prospect | IL |
| Dayton Dragons | Class A | Midwest | OH |
| Daytona Tortugas | Class A Advanced | Florida State | FL |
| DC Grays | Summer College | Cal Ripken | DC |
| Deep River Muddogs | Summer College | Carolina-Virginia | NC |
| DeLand Suns | Summer College | Florida Collegiate | FL |
| Delmarva Shorebirds | Class A | South Atlantic | MD |
| Delray Beach Lightning | Summer College | South Florida | FL |
| Denver Bats | Summer College | Rocky Mountain | CO |
| Denver Cougars | Summer College | Rocky Mountain | CO |
| Derby Twins | Summer College | Jayhawk | KS |
| Detroit Tigers | Majors | American League | MI |
| Dodge City A’s | Summer College | Jayhawk | KS |
| Dubois County Bombers | Summer College | Ohio Valley | IN |
| Duluth Huskies | Summer College | Northwoods | MN |
| Dunedin Blue Jays | Class A Advanced | Florida State | FL |
| DuPage Drones | Summer College | Prospect | IL |
| Durham Bulls | Triple-A | International | NC |
| East Texas Pump Jacks | Summer College | Texas Collegiate | TX |
| Eastside Diamond Hoppers | Independent | United Shore | MI |
| Eau Claire Express | Summer College | Northwoods | WI |
| Edenton Steamers | Summer College | Coastal Plain | NC |
| Edmonton Prospects | Summer College | Western Major | AB |
| El Dorado Broncos | Summer College | Jayhawk | KS |
| El Paso Chihuahuas | Triple-A | Pacific Coast | TX |
| Elizabethton Twins | Rookie | Appalachian | TN |
| Elmira Pioneers | Summer College | PGCBL | NY |
| Erie SeaWolves | Double-A | Eastern | PA |
| Eugene Emeralds | Class A Short | Northwest | OR |
| Evansville Otters | Independent | Frontier | IN |
| Everett AquaSox | Class A Short | Northwest | WA |
| Falmouth Commodores | Summer College | Cape Cod | MA |
| Fargo-Morehead | Independent | American Association | ND |
| Fayetteville Swampdogs | Summer College | Coastal Plain | NC |
| Florence Freedom | Independent | Frontier | KY |
| Florence Red Wolves | Summer College | Coastal Plain | SC |
| Florida Pokers | Summer College | South Florida | FL |
| Forest City Owls | Summer College | Coastal Plain | NC |
| Fort McMurray Giants | Summer College | Western Major | AB |
| Fort Myers Miracle | Class A Advanced | Florida State | FL |
| Fort Wayne TinCaps | Class A | Midwest | IN |
| Frederick Keys | Class A Advanced | Carolina | MD |
| Fresno Grizzlies | Triple-A | Pacific Coast | CA |
| Frisco RoughRiders | Double-A | Texas | TX |
| Front Royal Cardinals | Summer College | Valley | VA |
| Fuguay Varina Twins | Summer College | Carolina-Virginia | NC |
| Fulton Railroaders | Summer College | Ohio Valley | KY |
| Gaithersburg Giants | Summer College | Cal Ripken | MD |
| Garden City Wind | Independent | Pecos | KS |
| Gary Shore Shore Railcats | Independent | American Association | IN |
| Gastonia Grizzlies | Summer College | Coastal Plain | NC |
| Gateway Grizzlies | Independent | Frontier | IL |
| Genesee Rapids | Summer College | NYCBL | NY |
| Geneva Red Wings | Summer College | PGCBL | NY |
| Glastonbury Arrows | Summer College | Connecticut | CT |
| Glens Falls Dragons | Summer College | PGCBL | NY |
| Golden Grizz | Summer College | Rocky Mountain | CO |
| Grand Junction Rockies | Rookie | Pioneer | CO |
| Grand Lake Mariners | Summer College | Great Lakes | OH |
| Great Bend Boom | Independent | Pecos | KS |
| Great Falls Voyagers | Rookie | Pioneer | MT |
| Great Lakes Loons | Class A | Midwest | MI |
| Green Bay Bullfrogs | Summer College | Northwoods | WI |
| Greeneville Astros | Rookie | Appalachian | TN |
| Greensboro Grasshoppers | Class A | South Atlantic | NC |
| Greenville Drive | Class A | South Atlantic | SC |
| Gresham GreyWolves | Summer College | West Coast | OR |
| Gwinnett Braves | Triple-A | International | GA |
| Gwinnett Tides | Summer College | Sunbelt | GA |
| Hagerstown Suns | Class A | South Atlantic | MD |
| Hamilton Joes | Summer College | Great Lakes | OH |
| Hannibal Cavemen | Summer College | Prospect | MO |
| Harrisburg Senators | Double-A | Eastern | PA |
| Harrisonburg Turks | Summer College | Valley | VA |
| Hartford Yard Goats | Double-A | Eastern | CT |
| Harwich Mariners | Summer College | Cape Cod | MA |
| Hays Larks | Summer College | Jayhawk | KS |
| Haysville Aviators | Summer College | Jayhawk | KS |
| Helena Brewers | Rookie | Pioneer | MT |
| Heraldsburg Prune Packers | Summer College | California Collegiate | CA |
| Herndon Braves | Summer College | Cal Ripken | VA |
| Hickory Crawdads | Class A | South Atlantic | NC |
| High Desert Mavericks | Class A Advanced | California | CA |
| High Point – Thomasville HiToms | Summer College | Coastal Plain | NC |
| Hillsboro Hops | Class A Short | Northwest | OR |
| Holly Springs Salamanders | Summer College | Coastal Plain | NC |
| Hoptown Hoppers | Summer College | Ohio Valley | KY |
| Hornell Dodgers | Summer College | NYCBL | NY |
| Houston Astros | Majors | American League | TX |
| Hudson Valley Renegades | Class A Short | New York-Penn | NY |
| Hyannis Harbor Hawks | Summer College | Cape Cod | MA |
| Idaho Falls Chukars | Rookie | Pioneer | ID |
| Imperial County Ghost Riders | Independent | Desert | CA |
| Independence Veterans | Summer College | Mid-Plains | MO |
| Indianapolis Indians | Triple-A | International | IN |
| Inland Empire 66ers | Class A Advanced | California | CA |
| Inland Valley Pirates | Summer College | Sunset | CA |
| Iowa Cubs | Triple-A | Pacific Coast | IA |
| Irish Hills Leprechauns | Summer College | Great Lakes | MI |
| Jackson Generals | Double-A | Southern | TN |
| Jacksonville Suns | Double-A | Southern | FL |
| Jamestown Jammers | Summer College | PGCBL | NY |
| Jersey Pilots | Summer College | Atlantic Collegiate | NJ |
| Johnson City Cardinals | Rookie | Appalachian | TN |
| Joliet Slammers | Independent | Frontier | IL |
| Joplin Blasters | Independent | American Association | MO |
| Joplin Outlaws | Summer College | MINK | MO |
| Junction City Brigade | Summer College | Mid-Plains | KS |
| Jupiter Hammerheads | Class A Advanced | Florida State | FL |
| Kalamazoo Growlers | Summer College | Northwoods | MI |
| Kane County Cougars | Class A | Midwest | IL |
| Kannapolis Intimidators | Class A | South Atlantic | NC |
| Kansas City Royals | Majors | American League | MO |
| Kansas City T-Bones | Independent | American Association | KS |
| Keene Swamp Bats | Summer College | NECBL | NH |
| Kelowna Falcons | Summer College | West Coast | BC |
| Kenosha Kingfish | Summer College | Northwoods | WI |
| Kernersville Bulldogs | Summer College | Carolina-Virginia | NC |
| Kingsport Mets | Rookie | Appalachian | TN |
| Klamath Falls Gems | Summer College | Golden State | OR |
| Kokomo Jackrabbits | Summer College | Prospect | IN |
| La Crosse Loggers | Summer College | Northwoods | WI |
| Lafayette Aviators | Summer College | Prospect | IN |
| Lake County Captains | Class A | Midwest | OH |
| Lake Elsinore Storm | Class A Advanced | California | CA |
| Lake Erie Crushers | Independent | Frontier | OH |
| Lake Erie Monarchs | Summer College | Great Lakes | MI |
| Lake Norman Copperheads | Summer College | Southern Collegiate | NC |
| Lakeland Flying Tigers | Class A Advanced | Florida State | FL |
| Lakeshore Chinooks | Summer College | Northwoods | WI |
| Lakewood BlueClaws | Class A | South Atlantic | NJ |
| Lancaster Barnstormers | Independent | Atlantic | PA |
| Lancaster JetHawks | Class A Advanced | California | CA |
| Lansing Lugnuts | Class A | Midwest | MI |
| Laramie Colts | Summer College | Rocky Mountain | WY |
| Laredo Lemurs | Independent | American Association | TX |
| Las Vegas 51s | Triple-A | Pacific Coast | NV |
| Leesburg Lightning | Summer College | Florida Collegiate | FL |
| Lehigh Valley Cats | Summer College | Atlantic Collegiate | PA |
| Lehigh Valley IronPigs | Triple-A | International | PA |
| Lemay Governors | Summer College | Lewis & Clark | MO |
| Lenoir Oilers | Summer College | Carolina-Virginia | NC |
| Lethbridge Bulls | Summer College | Western Major | AB |
| Lexington Legends | Class A | South Atlantic | KY |
| Lexington County Blowfish | Summer College | Coastal Plain | SC |
| Liberal Bee Jays | Summer College | Jayhawk | KS |
| Liberty Monarchs | Summer College | Mid-Plains | MO |
| Licking County Settlers | Summer College | Great Lakes | OH |
| Lima Locos | Summer College | Great Lakes | OH |
| Lincoln Saltdogs | Independent | American Association | NE |
| Lodi Crushers | Summer College | Great West | CA |
| Long Beach Legends | Summer College | California Collegiate | CA |
| Long Island Ducks | Independent | Atlantic | NY |
| Lorain County Ironmen | Summer College | Great Lakes | OH |
| Los Angeles Angels of Anaheim | Majors | American League | CA |
| Los Angeles Dodgers | Majors | National League | CA |
| Louisville Bats | Triple-A | International | KY |
| Lowell Spinners | Class A Short | New York-Penn | MA |
| Lynchburg Hillcats | Class A Advanced | Carolina | VA |
| Madison Mallards | Summer College | Northwoods | WI |
| Madisonville Miners | Summer College | Ohio Valley | KY |
| Martha’s Vineyard Sharks | Summer College | Futures Collegiate | MA |
| Mahoning Valley Scrappers | Class A Short | New York-Penn | OH |
| Manchester Mavericks | Summer College | Connecticut | CT |
| Mankato MoonDogs | Summer College | Northwoods | MN |
| Marietta Patriots | Summer College | Sunbelt | GA |
| Martinsville Mustangs | Summer College | Coastal Plain | VA |
| Marysville Gold Sox | Summer College | Great West | CA |
| Matsu Oilers | Summer College | Alaska | AK |
| Medford Rouges | Summer College | Great West | OR |
| Medicine Hat Mavericks | Summer College | Western Major | AB |
| Melville Millionaires | Summer College | Western Major | SK |
| Memphis Redbirds | Triple-A | Pacific Coast | TN |
| Menlo Park Legends | Summer College | California Collegiate | CA |
| Miami Marlins | Majors | National League | FL |
| Midland RockHounds | Double-A | Texas | TX |
| Midwest Athletics | Summer College | Mid-Plains | MO |
| Milwaukee Brewers | Majors | National League | WI |
| Minnesota Twins | Majors | American League | MN |
| Mississippi Braves | Double-A | Southern | MS |
| Missoula Osprey | Rookie | Pioneer | MT |
| Mobile BayBears | Double-A | Southern | AL |
| Modesto Nuts | Class A Advanced | California | CA |
| Mohawk Valley DiamondDawgs | Summer College | PGCBL | NY |
| Montauk Mustangs | Summer College | Hamptons | NY |
| Montgomery Biscuits | Double-A | Southern | AL |
| Mooresville Spinners | Summer College | Carolina-Virginia | NC |
| Moose Jaw Miller Express | Summer College | Western Major | SK |
| Morehead City Marlins | Summer College | Coastal Plain | NC |
| Muhlenberg County Stallions | Summer College | Ohio Valley | KY |
| Myrtle Beach Pelicans | Class A Advanced | Carolina | SC |
| Mystic Schooners | Summer College | NECBL | CT |
| Nashua Silver Knights | Summer College | Futures Collegiate | NH |
| Nashville Sounds | Triple-A | Pacific Coast | TN |
| Neptune Beach Pearl | Summer College | California Collegiate | CA |
| Nevada Bighorns | Summer College | Golden State | NV |
| Nevada Griffins | Summer College | MINK | MO |
| New Bedford Bay Sox | Summer College | NECBL | MA |
| New Britian Bees | Independent | Atlantic | CT |
| New Hampshire Fisher Cats | Double-A | Eastern | NH |
| New Hampshire Wild | Independent | Empire | NH |
| New Jersey Jackals | Independent | Can-Am | NJ |
| New Market Rebels | Summer College | Valley | VA |
| New Orleans Zephyrs | Triple-A | Pacific Coast | LA |
| New York Mets | Majors | National League | NY |
| New York Yankees | Majors | American League | NY |
| Newark Pilots | Summer College | PGCBL | NY |
| Newport Gulls | Summer College | NECBL | RI |
| Norcross Astros | Summer College | Sunbelt | GA |
| Norfolk Tides | Triple-A | International | VA |
| Normal CornBelters | Independent | Frontier | IL |
| North Adams SteepleCats | Summer College | NECBL | MA |
| North Fork Ospreys | Summer College | Hamptons | NY |
| North Jersey Eagles | Summer College | Atlantic Collegiate | NJ |
| North Shore Navigatos | Summer College | Futures Collegiate | MA |
| North Wake Fungo | Summer College | Carolina-Virginia | NC |
| Northwest Arkansas Naturals | Double-A | Texas | AR |
| Oakland Athletics | Majors | American League | CA |
| Ocean State Waves | Summer College | NECBL | RI |
| O’Fallon Travelers | Summer College | Lewis & Clark | MO |
| Ogden Raptors | Rookie | Pioneer | UT |
| Okatoks Dawgs | Summer College | Western Major | AB |
| Oklahoma City Dodgers | Triple-A | Pacific Coast | OK |
| Old Orchard Beach Surge | Independent | Empire | ME |
| Olean Oilers | Summer College | NYCBL | NY |
| Omaha Storm Chasers | Triple-A | Pacific Coast | NE |
| Oneonta Outlaws | Summer College | PGCBL | NY |
| Orange County Riptide | Summer College | California Collegiate | CA |
| Orange County Surf | Summer College | Sunset | CA |
| Orleans Firebirds | Summer College | Cape Cod | MA |
| Ottawa Champions | Independent | Can-Am | ON |
| Orem Owlz | Rookie | Pioneer | UT |
| Owensboro Oilers | Summer College | Ohio Valley | KY |
| Ozark Generals | Summer College | MINK | MO |
| Paduah Chiefs | Summer College | Ohio Valley | KY |
| Palm Beach Cardinals | Class A Advanced | Florida State | FL |
| Palm Beach Extreme | Summer College | South Florida | FL |
| Pawtucket Red Sox | Triple-A | International | RI |
| Penisula Oilers | Summer College | Alaska | AK |
| Penisula Pilots | Summer College | Coastal Plain | VA |
| Pensacola Blue Wahoos | Double-A | Southern | FL |
| Peoria Chiefs | Class A | Midwest | IL |
| Petersburg Generals | Summer College | Coastal Plain | VA |
| Phenix City Crawdads | Summer College | Sunbelt | GA |
| Philadelphia Phillies | Majors | National League | PA |
| Phipps Park Barracudas | Summer College | South Florida | FL |
| Piedmont Pride | Summer College | Southern Collegiate | SC |
| Pittsburgh Diamonds | Independent | Pacific Association | CA |
| Pittsburgh Pirates | Majors | National League | PA |
| Pittsfield Suns | Summer College | Futures Collegiate | MA |
| Plymouth Pilgrims | Summer College | NECBL | MA |
| Pompano Beach Clippers | Summer College | South Florida | FL |
| Portland Pickles | Summer College | Great West | OR |
| Portland Sea Dogs | Double-A | Eastern | ME |
| Potomac Nationals | Class A Advanced | Carolina | VA |
| Princeton Rays | Rookie | Appalachian | WV |
| Pulaski Yankees | Rookie | Appalachian | VA |
| Purcellville Cannons | Summer College | Valley | VA |
| Quad Cities River Bandits | Class A | Midwest | IA |
| Quakertown Blazers | Summer College | Atlantic Collegiate | PA |
| Quebec Capitales | Independent | Can-Am | QC |
| Quincy Gems | Summer College | Prospect | IL |
| Rancho Cucamonga Quakes | Class A Advanced | California | CA |
| Reading Fightin Phils | Double-A | Eastern | PA |
| Regina Red Sox | Summer College | Western Major | SK |
| Reno Aces | Triple-A | Pacific Coast | NV |
| Richmond Flying Squirrels | Double-A | Eastern | VA |
| Richmond Jazz | Summer College | Great Lakes | IN |
| Rise Up Baseball | Summer College | Carolina-Virginia | NC |
| River City Rascals | Independent | Frontier | MO |
| Riverhead Tomcats | Summer College | Hamptons | NY |
| Roanoke Rails | Summer College | Carolina-Virginia | VA |
| Rochester Honkers | Summer College | Northwoods | MN |
| Rochester Red Wings | Triple-A | International | NY |
| Rochester Ridgemen | Summer College | NYCBL | NY |
| Rockford Rivets | Summer College | Northwoods | IL |
| Rockland Boulders | Independent | Can-Am | NY |
| Rockville Express | Summer College | Cal Ripken | MD |
| Rome Braves | Class A | South Atlantic | GA |
| Rome Generals | Summer College | NYCBL | NY |
| Rossville Rattlers | Summer College | Mid-Plains | KS |
| Roswell Invaders | Independent | Pecos | NM |
| Round Rock Express | Triple-A | Pacific Coast | TX |
| Sabetha Lobos | Summer College | Mid-Plains | KS |
| Sacramento Heat | Summer College | Golden State | CA |
| Sacramento River Cats | Triple-A | Pacific Coast | CA |
| Sacramento Stealth | Summer College | Great West | CA |
| Sag Harbor Whalers | Summer College | Hamptons | NY |
| Salem Red Sox | Class A Advanced | Carolina | VA |
| Salem-Keizer Volcanoes | Class A Short | Northwest | OR |
| Salina Stockade | Independent | Pecos | KS |
| Salt Lake Bees | Triple-A | Pacific Coast | UT |
| San Antonio Missions | Double-A | Texas | TX |
| San Diego Padres | Majors | National League | CA |
| San Francisco Giants | Majors | National League | CA |
| San Francisco Seagulls | Summer College | Golden State | CA |
| San Jose Giants | Class A Advanced | California | CA |
| San Luis Obispo Blues | Summer College | California Collegiate | CA |
| San Rafael Pacifics | Independent | Pacific Association | CA |
| Sanford Mainers | Summer College | NECBL | ME |
| Sanford River Rats | Summer College | Florida Collegiate | FL |
| Santa Barbara Forresters | Summer College | California Collegiate | CA |
| Santa Fe Fuego | Independent | Pecos | NM |
| Saugerties | Summer College | PGCBL | NY |
| Savannah Bananas | Summer College | Coastal Plain | GA |
| SBA Bones | Summer College | Southern Collegiate | NC |
| Schaumburg Boomers | Independent | Frontier | IL |
| Scranton/Wilkes-Barre RailRiders | Triple-A | International | PA |
| Seacoast Mavericks | Summer College | Futures Collegiate | NH |
| Seattle Mariners | Majors | American League | WA |
| Seattle Studs | Summer College | Independent | WA |
| Sedalia Bombers | Summer College | MINK | MO |
| Shelter Island Bucks | Summer College | Hamptons | NY |
| Sherrill Silversmiths | Summer College | NYCBL | NY |
| Signal Hill Oilers | Summer College | Sunset | CA |
| Silver Spring – Takoma Thunderbolts | Summer College | Cal Ripken | MD |
| Simsbury Sabercats | Summer College | Connecticut | CT |
| Sioux City Explorers | Independent | American Association | IA |
| Sioux Falls Canaries | Independent | American Association | SD |
| Slammers | Summer College | Rocky Mountain | CO |
| Solana Beach Cardinals | Summer College | Sunset | CA |
| Somerset Patriots | Independent | Atlantic | NJ |
| Somerton Caneros | Independent | Desert | AZ |
| Sonoma Stompers | Independent | Pacific Association | CA |
| South Bay Sliders | Summer College | Sunset | CA |
| South Bay Storm | Summer College | Golden State | CA |
| South Bend Cubs | Class A | Midwest | IN |
| South Florida Huskies | Summer College | South Florida | FL |
| South Jersey Giants | Summer College | Atlantic Collegiate | NJ |
| Southern California Catch | Summer College | California Collegiate | CA |
| Southern Illinois Miners | Independent | Frontier | IL |
| Southern Maryland Blue Crabs | Independent | Atlantic | MD |
| Southern Ohio Copperheads | Summer College | Great Lakes | OH |
| Southhampton Breakers | Summer College | Hamptons | NY |
| Southington Shock | Summer College | Connecticut | CT |
| Spokane Indians | Class A Short | Northwest | WA |
| Springfield Cardinals | Double-A | Texas | MO |
| Springfield Sliders | Summer College | Prospect | IL |
| St. Charles Captains | Summer College | Lewis & Clark | MO |
| St. Cloud Rox | Summer College | Northwoods | MN |
| St. Joseph Mustangs | Summer College | MINK | MO |
| St. Louis Cardinals | Majors | National League | MO |
| St. Louis Gamers | Summer College | Lewis & Clark | MO |
| St. Lucie Mets | Class A Advanced | Florida State | FL |
| St. Paul Saints | Independent | American Association | MN |
| State College Spikes | Class A Short | New York-Penn | PA |
| Staten Island Tide | Summer College | Atlantic Collegiate | NY |
| Staten Island Yankees | Class A Short | New York-Penn | NY |
| Staunton Braves | Summer College | Valley | VA |
| Sterling X-Press | Summer College | Rocky Mountain | CO |
| Stockton Ports | Class A Advanced | California | CA |
| Strasburg Express | Summer College | Valley | VA |
| Sugar Land Skeeters | Independent | Atlantic | TX |
| Sullivan Explorers | Independent | Empire | NY |
| Superior Rough Riders | Summer College | Rocky Mountain | CO |
| Sussex County Miners | Independent | Can-Am | NJ |
| Swift Current Indians | Summer College | Western Major | SK |
| Syracuse Chiefs | Triple-A | International | NY |
| Syracuse Jr. Chiefs | Summer College | NYCBL | NY |
| Syracuse Salt Cats | Summer College | NYCBL | NY |
| Tacoma Rainiers | Triple-A | Pacific Coast | WA |
| Tampa Yankees | Class A Advanced | Florida State | FL |
| Tampa Bay Rays | Majors | American League | FL |
| Team Charlotte | Summer College | Southern Collegiate | NC |
| Tennessee Smokies | Double-A | Southern | TN |
| Terre Haute Rex | Summer College | Prospect | IN |
| Texas AirHogs | Independent | American Association | TX |
| Texas Marshals | Summer College | Texas Collegiate | TX |
| Texas Rangers | Majors | American League | TX |
| The Woodlands Strykers | Summer College | Texas Collegiate | TX |
| Thunder Bay Border Cats | Summer College | Northwoods | ON |
| Tobacco Valley Renegades | Summer College | Connecticut | CT |
| Toledo Mud Hens | Triple-A | International | OH |
| Top Speed Baseball | Summer College | Golden State | CA |
| Topeka Golden Giants | Summer College | Mid-Plains | KS |
| Topeka Train Robbers | Independent | Pecos | KS |
| Toronto Blue Jays | Majors | American League | ON |
| Torrington Titans | Summer College | Futures Collegiate | CT |
| Traverse City Beach Bums | Independent | Frontier | MI |
| Trenton Generals | Summer College | Atlantic Collegiate | NJ |
| Trenton Thunder | Double-A | Eastern | NJ |
| Tri-City Dust Devils | Class A Short | Northwest | WA |
| Tri-City ValleyCats | Class A Short | New York-Penn | NY |
| Trinidad Triggers | Independent | Pecos | CO |
| Trois-Rivieres Aigles | Independent | Can-Am | QC |
| Tucson Saguaros | Independent | Pecos | AZ |
| Tulsa Drillers | Double-A | Texas | OK |
| Upper Valley Nighthawks | Summer College | NECBL | VT |
| Utica Blue Sox | Summer College | PGCBL | NY |
| Utica Unicorns | Independent | United Shore | MI |
| Vallejo Admirals | Independent | Pacific Association | CA |
| Valley Blue Sox | Summer College | NECBL | MA |
| Vancouver Canadians | Class A Short | Northwest | BC |
| Ventura Halos | Summer College | California Collegiate | CA |
| Vermont Lake Monsters | Class A Short | New York-Penn | VT |
| Vermont Mountaineers | Summer College | NECBL | VT |
| Victor RailRaidiers | Summer College | PGCBL | NY |
| Victoria Generals | Summer College | Texas Collegiate | TX |
| Victoria HarbourCats | Summer College | West Coast | BC |
| Vienna River Dogs | Summer College | Cal Ripken | VA |
| Visalia Rawhide | Class A Advanced | California | CA |
| Wachusett Dirt Dawgs | Summer College | Futures Collegiate | MA |
| Walla Walla Sweets | Summer College | West Coast | WA |
| Walnut Creek Crawdads | Summer College | California Collegiate | CA |
| Wareham Gatemen | Summer College | Cape Cod | MA |
| Washington Nationals | Majors | National League | DC |
| Washington Wild Things | Independent | Frontier | PA |
| Waterloo Bucks | Summer College | Northwoods | IA |
| Watertown Bucks | Independent | Empire | NY |
| Waynesboro Generals | Summer College | Valley | VA |
| Wellington Heat | Summer College | Jayhawk | KS |
| Wellsville Nitros | Summer College | NYCBL | NY |
| Wenatchee Applesox | Summer College | West Coast | WA |
| West Boca Snappers | Summer College | South Florida | FL |
| West Hartford Thunder | Summer College | Connecticut | CT |
| West Michigan Whitecaps | Class A | Midwest | MI |
| West Palm Beach Sharks | Summer College | South Florida | FL |
| West Virginia Black Bears | Class A Short | New York-Penn | WV |
| West Virginia Miners | Summer College | Prospect | WV |
| West Virginia Power | Class A | South Atlantic | WV |
| Westhampton Aviators | Summer College | Hamptons | NY |
| Weyburn Beavers | Summer College | Western Major | SK |
| White Sands Pupfish | Independent | Pecos | NM |
| Wichita Wingnuts | Independent | American Association | KS |
| Williamsport Crosscutters | Class A Short | New York-Penn | PA |
| Willmar Stingers | Summer College | Northwoods | MN |
| Wilmington Blue Rocks | Class A Advanced | Carolina | DE |
| Wilmington Sharks | Summer College | Coastal Plain | NC |
| Wilson Tobs | Summer College | Coastal Plain | NC |
| Winchester Royals | Summer College | Valley | VA |
| Windy City Thunderbolts | Independent | Frontier | IL |
| Winnipeg Goldeyes | Independent | American Association | MB |
| Winnepesaukee Musrats | Summer College | NECBL | NH |
| Winston-Salem Dash | Class A Advanced | Carolina | NC |
| Winter Garden Squeeze | Summer College | Florida Collegiate | FL |
| Winter Park Diamond Dawgs | Summer College | Florida Collegiate | FL |
| Wisconsin Timber Rattlers | Class A | Midwest | WI |
| Wisconsin Woodchucks | Summer College | Northwoods | WI |
| Wisconsin Rapids Rafters | Summer College | Northwoods | WI |
| Woodstock River Bandits | Summer College | Valley | VA |
| Worcester Bravehearts | Summer College | Futures Collegiate | MA |
| Xenia Scouts | Summer College | Great Lakes | OH |
| Yakima Valley Pippins | Summer College | West Coast | WA |
| Yarmouth-Denis Red Sox | Summer College | Cape Cod | MA |
| York Revolution | Independent | Atlantic | PA |
| Yorkton Cardinals | Summer College | Western Major | SK |
| Yuma Hammers | Independent | Desert | AZ |
| Yuma Maple Leafs | Independent | Desert | AZ |
There you have it every team from the Aberdeen IronBirds to the Yuma Maple Leafs is listed here. In case you were wondering, there are 565 teams listed in total. Every state/province is represented except for Hawaii and the four Atlantic provinces.
Maritime Pro Ball 
Cool list. Thanks for compiling! I collect lineup cards from pro and college summer leagues (https://lineupcards.wordpress.com/) and this will help me track which teams I have (more so, which I don’t have).
I believe you are missing two new Indy leagues: The United Shore Professional Baseball League (USPBL: https://uspbl.com/) and Desert League of Professional Baseball (http://desertleague.com/). Both just started play this year.
Also, one of the small college summer leagues not on the list is the Connecticut Collegiate Baseball League (CCBL: http://ctcollegebaseballleague.org/)
Thanks for the kind words. I forgot about the USPBL and was unaware of the Desert League. I will try to add these soon as well as a few other summer college leagues. I know of a couple in the St. Louis area that I need to add.