| Cuban Winter League | | |
| California Winter League | | |
| | |
| American Association | A | Columbus Senators, Indianapolis Indians, Kansas City Blues, Louisville Colonels, Milwaukee Brewers, Minneapolis Millers, St. Paul Saints, Toledo Mud Hens |
| Eastern League | A | Baltimore Orioles, Buffalo Bisons, Jersey City Skeeters, Montreal Royals, Newark Sailors, Providence Grays, Rochester Bronchos, Toronto Maple Leafs |
| Pacific Coast League | A | Fresno Raisin Eaters, Los Angeles Angels, Oakland Oaks, Portland Beavers, San Francisco Seals, Seattle Siwashes |
| Southern Association | A | Atlanta Crackers, Birmingham Barons, Little Rock Travelers, Memphis Egyptians, Montgomery Senators, Nashville Volunteers, New Orleans Pelicans, Shreveport Pirates |
| Western League | A | Denver Grizzlies, Des Moines Champs, Lincoln Ducklings, Omaha Rourkes, Pueblo Indians, Sioux City Packers |
| | |
| Central League | B | Canton Chinamen, Dayton Veterans, Evansville River Rats, Grand Rapids Wolverines, South Bend Greens, Springfield Babes, Terre Haute Hottentots, Wheeling Stogies |
| Connecticut State League | B | Bridgeport Orators, Hartford Senators, Holyoke Paperweights, New Haven Blues, New London Whalers, Norwich Reds, Springfield Ponies, Waterbury Authors |
| Illinois-Indiana-Iowa League | B | Bloomington Bloomers, Cedar Rapids Rabbits, Davenport Knickerbockers, Decatur Commodores, Dubuque Dubs, Peoria Distillers, Rock Island Islanders, Springfield Senators |
| New England League | B | Fall River Indians, Haverhill Hustlers, Lawrence Colts, Lowell Tigers, Lynn Shoemakers, Manchester Textiles, New Bedford Whalers, Worcester Busters |
| New York State League | B | Albany Senators, Amsterdam-Gloversville-Johnstown Jags, Binghamton Bingoes, Scranton Miners, Syracuse Stars, Troy Trojans, Utica Pent-Ups, Wilkes-Barre Barons |
| Northwestern League | B | Butte Miners, Grays Harbor Lumbermen, Spokane Indians, Tacoma Tigers |
| | |
| Hudson River League | C | Glens Falls-Saratoga Springs, Hudson Marines, Kingston Colonials, Newburgh Hill Climbers, Paterson Intruders, Poughkeepsie Colts |
| Interstate Association | C | Anderson, Bay City, Flint Vehicles, Fort Wayne, Lima, Marion, Muncie Fruit Jars, Saginaw |
| Northern-Copper Country League | C | Calumet Aristocrats, Duluth White Sox, Fargo, Grand Forks Forkers, Hancock Infants, Houghton Giants, Lake Linden Sandy Cities, Winnipeg Maroons |
| Ohio-Pennsylvania League | C | Akron Rubbernecks, Lancaster Lanks, Mansfield Giants, New Castle Outlaws, Newark Cotton Tops, Sharon Steels, Youngstown Ohio Works, Zanesville/Marion Moguls |
| South Atlantic League | C | Augusta Tourists, Charleston Sea Gulls, Columbia Gamecocks, Jacksonville Jays, Macon Brigands, Savannah Indians |
| South Texas League | C | Austin Senators, Beaumont Oilers, Galveston Sand Crabs, Houston Buffaloes, Lake Charles Creoles, San Antonio Bronchos |
| Virginia League | C | Danville Red Sox, Lynchburg Shoemakers, Norfolk Tars, Portsmouth Truckers, Richmond Colts, Roanoke Tigers |
| Western Association | C | Joplin Miners, Leavenworth Old Soldiers, Oklahoma City Mets, Springfield Midgets, St. Joseph Packers/Hutchinson Salt Packers, Topeka White Sox, Webb City Goldbugs, Wichita Jobbers |
| | |
| Arkansas-Texas League | D | Camden Ouachitas, Hot Springs Vapors, Pine Bluff Barristers, Texarkana Shine-Oners |
| Cotton States League | D | Baton Rouge Cajuns, Gulfport Crabs, Jackson Senators, Meridian Ribboners, Mobile Sea Gulls, Vicksburg Hill Billies |
| Empire State League | D | Auburn, Fulton, Geneva, Oswego, Penn Yan, Seneca Falls |
| Georgia State League | D | Albany, Americus Pallbearers, Columbus/Brunswick River Snipes, Cordele, Valdosta Stars, Waycross Machinists |
| Interstate League | D | Bradford Drillers, DuBois Miners, Erie Sailors, Hornell/Patton Pigmies, Kane Mountaineers, Oil City-Jamestown Oseejays, Olean Refiners, Punxsutawney Policemen |
| Iowa League of Professional Baseball Clubs | D | Boone/Clinton Miners, Burlington Pathfinders, Fort Dodge Gypsumites, Keokuk Indians, Marshalltown Brownies, Oskaloosa Quakers, Ottumwa Champs, Waterloo Microbes |
| Kansas State League | D | Bartlesville Indians, Chanute Browns, Coffeyville Bricks, Fort Scott Giants, Independence Coyotes, Iola Grays/Cherryvale Boosters, Parsons Preachers, Pittsburg/Vinita Champs |
| Kentucky-Illinois-Tennessee League | D | Cairo Giants, Danville Old Soldiers, Jacksonville Jacks, Mattoon-Charleston Canaries, Paducah Indians, Vincennes Alices |
| Pennsylvania-Ohio-Maryland League | D | Braddock Infants, Butler/Piedmont/Charleroi, Cumberland Rooters, East Liverpool, Steubenville Stubs, Uniontown Coal Barons, Washington, Waynesburg |
| South Carolina League | D | |
| South Central League | D | Fort Smith Razorbacks, Guthrie Senators, Muskogee Indians, Shawnee Blues, South McAlester Miners, Tulsa Oilers |
| Southern Michigan League | D | Battle Creek Crickets, Jackson Convicts, Kalamazoo White Sox, Mount Clemens Bathers, Saginaw, Tecumseh |
| Southwest Washington League | D | Aberdeen Pippins, Hoquiam Loggers, Olympia Senators |
| Texas League | D | Cleburne Railroaders, Dallas Giants, Fort Worth Panthers, Greenville Hunters, Temple Boll Weevils, Waco Navigators |
| Wisconsin State League | D | Eau Claire-Chippewa Falls Orphans, Freeport Pretzels, Green Bay Colts, La Crosse Pinks, Oshkosh Indians, Wausau Lumberjacks |
| | |
| Cuban General League | Foreign | Almendares, Fe, Habana |
| Cuban League | Foreign | Alerta, Azul, Rojo |
| Cuban-American Negro Clubs Series | Foreign | Almendares, Cuban X Giants, Habana |
| | |
| California League | Independent | Alameda Grays, Oakland Commuters, Sacramento Cordovas, San Francisco Orphans, San Jose Prune Pickers, Stockton Millers |
| Tri-State League | Independent | Altoona Mountaineers, Harrisburg Senators, Johnstown Johnnies, Lancaster Red Roses, Williamsport Millionaires, York Penn Parks |
| | |
| Ilip | Negro | Cuban Stars, Cuban X-Giants, Havana Stars, Philadelphia Giants, Philadelphia Professionals, Quaker Giants, Riverton-Palmyra, Wilmington Giants |
| | |
| California State League | No Classification | Alameda, Oakland Commuters, Presidio Soldiers, Sacramento Cordovas, San Jose Prune Pickers, Stockton Millers |
| Texas Valley League | No Classification | |
.
Partner of USA TODAY Sports Digital Properties.