| Cuban Federation Winter League | | |
| Cuban Winter League | | |
| Mexican Pacific Winter League | | |
| Panama Winter League | | |
| Puerto Rican Winter League | | |
| Venezuelan Winter League | | |
| Independent Negro | | Asheville Blues, Atlanta Black Crackers, Brooklyn Brown Dodgers, Cincinnati Crescents, Colored Athletics, Knoxville Giants, Nashville Cubs |
| All-American Girls Professional Baseball League | | Fort Wayne Daisies, Grand Rapids Chicks, Kenosha Comets, Muskegon Lassies, Peoria Redwings, Racine Belles, Rockford Peaches, South Bend Blue Sox |
| California Winter League | | |
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| American Association | AAA | Columbus Red Birds, Indianapolis Indians, Kansas City Blues, Louisville Colonels, Milwaukee Brewers, Minneapolis Millers, St. Paul Saints, Toledo Mud Hens |
| International League | AAA | Baltimore Orioles, Buffalo Bisons, Jersey City Giants, Montreal Royals, Newark Bears, Rochester Red Wings, Syracuse Chiefs, Toronto Maple Leafs |
| Pacific Coast League | AAA | Hollywood Stars, Los Angeles Angels, Oakland Oaks, Portland Beavers, Sacramento Solons, San Diego Padres, San Francisco Seals, Seattle Rainiers |
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| Southern Association | AA | Atlanta Crackers, Birmingham Barons, Chattanooga Lookouts, Little Rock Travelers, Memphis Chickasaws, Mobile Bears, Nashville Volunteers, New Orleans Pelicans |
| Texas League | AA | Beaumont Exporters, Dallas Rebels, Fort Worth Cats, Houston Buffaloes, Oklahoma City Indians, San Antonio Missions, Shreveport Sports, Tulsa Oilers |
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| Eastern League | A | Albany Senators, Binghamton Triplets, Elmira Pioneers, Hartford Chiefs, Scranton Red Sox, Utica Blue Sox, Wilkes-Barre Barons, Williamsport Grays |
| South Atlantic League | A | Augusta Tigers, Charleston Rebels, Columbia Reds, Columbus Cardinals, Greenville Spinners, Jacksonville Tars, Macon Peaches, Savannah Indians |
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| Illinois-Indiana-Iowa League | B | Danville Dodgers, Davenport Cubs, Decatur Commodores, Evansville Braves, Quincy Gems, Springfield Browns, Terre Haute Phillies, Waterloo White Hawks |
| Interstate League | B | Allentown Cardinals, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Sunbury Yankees, Trenton Giants, Wilmington Blue Rocks, York White Roses |
| Mexican National League | B | Chihuahua Dorados, El Paso Texans, Juarez Indios, Mexico City Aztecs, Saltillo Peroneros, Torreon-Gomez Palacio Laguneros |
| New England League | B | Fall River Indians, Lawrence Millionaires, Lynn Red Sox, Manchester Giants, Nashua Dodgers, Pawtucket Slaters, Portland Gulls, Providence Chiefs |
| Piedmont League | B | Lynchburg Cardinals, Newport News Dodgers, Norfolk Tars, Portsmouth Cubs, Richmond Colts, Roanoke Red Sox |
| Southeastern League | B | Anniston Rams, Gadsden Pilots, Jackson Senators, Meridian Peps, Montgomery Rebels, Pensacola Fliers, Selma Cloverleafs, Vicksburg Billies |
| Tri-State League | B | Anderson A's, Asheville Tourists, Charlotte Hornets, Knoxville Smokies, Shelby Cubs, Spartanburg Peaches |
| Western International League | B | Bremerton Bluejackets, Salem Senators, Spokane Indians, Tacoma Tigers, Vancouver Capilanos, Victoria Athletics, Wenatchee Chiefs, Yakima Stars |
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| Border League | C | Auburn Cayugas, Granby Red Sox, Kingston Ponies, Ogdensburg Maples, Sherbrooke Canadians, Watertown Athletics |
| California League | C | Bakersfield Indians, Fresno Cardinals, Modesto Reds, Santa Barbara Dodgers, Stockton Ports, Visalia Cubs |
| Canadian-American League | C | Amsterdam Rugmakers, Gloversville-Johnstown Glovers, Oneonta Red Sox, Pittsfield Electrics, Quebec Alouettes, Rome Colonels, Schenectady Blue Jays, Trois-Rivieres Royals |
| Carolina League | C | Burlington Bees, Danville Leafs, Durham Bulls, Greensboro Patriots, Leaksville-Draper-Spray Triplets, Martinsville A's, Raleigh Capitals, Winston-Salem Cardinals |
| East Texas League | C | Greenville Majors, Henderson Oilers, Jacksonville Jax, Lufkin Foresters, Paris Red Peppers, Sherman Twins, Texarkana Bears, Tyler Trojans |
| Florida International League | C | Havana Cubans, Lakeland Pilots, Miami Beach Flamingos, Miami Sun Sox, Tampa Smokers, West Palm Beach Indians |
| Middle Atlantic League | C | Butler Yankees, Erie Sailors, Johnstown Johnnies, Niagara Falls Frontiers, Oil City Oilers, Youngstown Gremlins |
| Northern League | C | Aberdeen Pheasants, Duluth Dukes, Eau Claire Bears, Fargo-Moorhead Twins, Grand Forks Chiefs, Sioux Falls Canaries, St. Cloud Rox, Superior Blues |
| Pioneer League | C | Boise Pilots, Idaho Falls Russets, Ogden Reds, Pocatello Cardinals, Salt Lake City Bees, Twin Falls Cowboys |
| West Texas-New Mexico League | C | Abilene Blue Sox, Albuquerque Dukes, Amarillo Gold Sox, Borger Gassers, Clovis Pioneers, Lamesa Lobos, Lubbock Hubbers, Pampa Oilers |
| Western Association | C | Fort Smith Giants, Hutchinson Cubs, Joplin Miners, Leavenworth Braves, Muskogee Reds, Salina Blue Jays, St. Joseph Cardinals, Topeka Owls |
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| Alabama State League | D | Brewton Millers, Dothan Browns, Geneva Red Birds, Greenville Lions, Ozark Eagles, Troy Trojans |
| Appalachian League | D | Bluefield Blue-Grays, Bristol Twins, Elizabethton Betsy Cubs, Johnson City Cardinals, Kingsport Cherokees, New River Rebels, Pulaski Counts, Welch Miners |
| Blue Ridge League | D | Galax Leafs, Mount Airy Graniteers, Radford Rockets, Salem Friends/Lenoir Red Sox |
| Coastal Plain League | D | Fayetteville Cubs, Goldsboro Goldbugs, Greenville Greenies, Kinston Eagles, New Bern Bears, Rocky Mount Rocks, Tarboro Tars, Wilson Tobs |
| Eastern Shore League | D | Cambridge Dodgers, Centreville Orioles, Dover Phillies, Easton Yankees, Federalsburg A's, Milford Red Sox, Salisbury Cardinals, Seaford Eagles |
| Evangeline League | D | Abbeville Athletics, Alexandria Aces, Baton Rouge Red Sticks, Hammond Berries, Houma Indians, Natchez Giants, New Iberia Cardinals, Thibodaux Giants |
| Florida State League | D | Daytona Beach Islanders, DeLand Red Hats, Gainesville G-Men, Leesburg Anglers, Orlando Senators, Palatka Azaleas, Sanford Celeryfeds, St. Augustine Saints |
| Georgia-Alabama League | D | Carrollton Hornets, La Grange Troupers, Newnan Brownies, Opelika Owls, Tallassee Indians, Valley Rebels |
| Georgia-Florida League | D | Albany Cardinals, Americus Phillies, Cordele White Sox, Moultrie Packers, Tallahassee Pirates, Thomasville Tigers, Valdosta Dodgers, Waycross Bears |
| Kansas-Oklahoma-Missouri League | D | Bartlesville Oilers, Carthage Cardinals, Chanute Owls, Iola Cubs, Miami Blues, Pittsburg Browns |
| Kentucky-Illinois-Tennessee League | D | Cairo Egyptians, Clarksville Owls, Fulton Bulldogs, Hopkinsville Hoppers, Madisonville Miners, Mayfield Clothiers, Owensboro Oilers, Union City Greyhounds |
| North Atlantic League | D | Bloomingdale Troopers, Carbondale Pioneers, Mahanoy City Bluebirds, Nazareth Cement Dusters, Newburgh/Walden Hummingbirds, Nyack Rocklands, Peekskill Highlanders, Stroudsburg Poconos |
| North Carolina State League | D | Concord Weavers, Hickory Rebels, Landis Millers, Lexington A's, Mooresville Moors, Salisbury Pirates, Statesville Cubs, Thomasville Dodgers |
| Ohio State League | D | Dayton Indians, Lima Terriers, Marion Cardinals, Middletown Rockets, Newark Moundsmen, Richmond Roses, Springfield Giants, Zanesville Dodgers |
| Pennsylvania-Ontario-New York League | D | Batavia Clippers, Bradford Blue Wings, Hamilton Cardinals, Hornell Maples, Jamestown Falcons, Lockport Cubs, Olean Oilers, Wellsville Yankees |
| Tobacco State League | D | Angier-Fuquay Springs Bulls, Clinton Blues, Dunn-Erwin Twins, Sanford Spinners, Smithfield-Selma Leafs, Wilmington Pirates |
| Wisconsin State League | D | Appleton Papermakers, Fond du Lac Panthers, Green Bay Bluejays, Janesville Bears, Oshkosh Giants, Sheboygan Indians, Wausau Lumberjacks, Wisconsin Rapids White Sox |
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| Cuban League | Foreign | |
| Japanese Baseball League | Foreign | Chubu Nippon, Gold Star, Hankyu, Kinki Great Ring, Osaka Tigers, Pacific, Senators, Tokyo Kyojin |
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| Mexican League | Independent | Mexico City Diablos Rojos, Monterrey Industriales, Nuevo Laredo Tecolotes, Puebla Angeles, San Luis Potosi Tuneros, Tampico Alijadores, Torreon Algodoneros, Veracruz Azules |
| Quebec Provincial League | Independent | |
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| United States Baseball League | Negro | Boston Blues, Cleveland Clippers, Milwaukee, Pittsburgh Crawfords |
| West Coast Baseball League | Negro | Los Angeles White Sox, Oakland Larks, Portland Rosebuds, San Diego Tigers, San Francisco Sea Lions, Seattle Steelheads |
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| Negro American League | Negro Majors | Birmingham Black Barons, Chicago American Giants, Cleveland Buckeyes, Indianapolis Clowns, Kansas City Monarchs, Memphis Red Sox |
| Negro National League | Negro Majors | Baltimore Elite Giants, Homestead Grays, New York Black Yankees, New York Cubans, Newark Eagles, Philadelphia Stars |
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