| Cuban Winter League | | |
| Puerto Rican Winter League | | |
| Independent Negro | | Atlantic City Bacharach Giants, Brooklyn Royal Giants, Jacksonville Red Caps |
| California Winter League | | |
| | |
| American Association | AA | Columbus Red Birds, Indianapolis Indians, Kansas City Blues, Louisville Colonels, Milwaukee Brewers, Minneapolis Millers, St. Paul Saints, Toledo Mud Hens |
| International League | AA | Baltimore Orioles, Buffalo Bisons, Jersey City Giants, Montreal Royals, Newark Bears, Rochester Red Wings, Syracuse Chiefs, Toronto Maple Leafs |
| Pacific Coast League | AA | Hollywood Stars, Los Angeles Angels, Oakland Oaks, Portland Beavers, Sacramento Solons, San Diego Padres, San Francisco Seals, Seattle Rainiers |
| | |
| Eastern League | A | Albany Senators, Binghamton Triplets, Elmira Pioneers, Hartford Bees, Scranton Red Sox, Springfield Nationals, Wilkes-Barre Barons, Williamsport Grays |
| | |
| Southern Association | A-1 | Atlanta Crackers, Birmingham Barons, Chattanooga Lookouts, Knoxville Smokies, Little Rock Travelers, Memphis Chickasaws, Nashville Volunteers, New Orleans Pelicans |
| Texas League | A-1 | Beaumont Exporters, Dallas Rebels, Fort Worth Cats, Houston Buffaloes, Oklahoma City Indians, San Antonio Missions, Shreveport Sports, Tulsa Oilers |
| | |
| Illinois-Indiana-Iowa League | B | Bloomington Bloomers, Cedar Rapids Raiders, Clinton Giants, Decatur Commodores, Evansville Bees, Moline Plow Boys, Springfield Browns, Waterloo Red Hawks |
| Piedmont League | B | Asheville Tourists, Charlotte Hornets, Durham Bulls, Norfolk Tars, Portsmouth Cubs, Richmond Colts, Rocky Mount Red Sox, Winston-Salem Twins |
| South Atlantic League | B | Augusta Tigers, Columbia Reds, Columbus Red Birds, Greenville Spinners, Jacksonville Tars, Macon Peaches, Savannah Indians, Spartanburg Spartans |
| Southeastern League | B | Anniston Rams, Gadsden Pilots, Jackson Senators, Meridian Scrappers, Mobile Shippers, Montgomery Rebels, Pensacola Pilots, Selma Cloverleafs |
| Western International League | B | Bellingham Chinooks, Spokane Hawks, Tacoma Tigers, Vancouver Capilanos, Wenatchee Chiefs, Yakima Pippins |
| | |
| Canadian-American League | C | Amsterdam Rugmakers, Cornwall Maple Leafs, Gloversville-Johnstown Glovers, Ogdensburg Colts, Oswego Netherlands, Ottawa Senators, Rome Colonels, Utica Braves |
| Cape Breton Colliery League | C | Glace Bay Miners, New Waterford Dodgers, Sydney Mines Ramblers, Sydney Steel Citians |
| Cotton States League | C | Clarksdale Red Sox, El Dorado Lions, Greenville Buckshots, Greenwood Crackers, Helena Seaporters, Hot Springs Bathers, Monroe White Sox, Pine Bluff Judges |
| East Texas League | C | Henderson Oilers, Jacksonville Jax, Kilgore Boomers, Longview Cannibals/White Sox, Marshall Tigers, Palestine Pals, Texarkana Liners, Tyler Trojans |
| Interstate League | C | Allentown Dukes, Hazleton Mountaineers, Sunbury Senators, Trenton Senators |
| Middle Atlantic League | C | Akron Yankees, Canton Terriers, Charleston Senators, Dayton Wings, Erie Sailors, Portsmouth Red Birds, Springfield Indians, Youngstown Browns |
| Pioneer League | C | Boise Pilots, Lewiston Indians, Ogden Reds, Pocatello Cardinals, Salt Lake City Bees, Twin Falls Cowboys |
| Western Association | C | Fort Smith Giants, Hutchinson Pirates, Joplin Miners, Muskogee Reds, Salina Millers, Springfield Cardinals, St. Joseph Angels, Topeka Owls |
| | |
| Alabama-Florida League | D | Andalusia Rams, Dothan Browns, Greenville Lions, Panama City Pelicans, Tallassee Indians, Troy Trojans |
| Appalachian League | D | Elizabethton Betsy Red Sox, Greeneville Burley Cubs, Johnson City Cardinals, Kingsport Cherokees, Newport Canners, Pennington Gap Miners |
| Arizona-Texas League | D | Albuquerque Cardinals, Bisbee Bees, El Paso Texans, Tucson Cowboys |
| Arkansas-Missouri League | D | Carthage Pirates, Fayetteville Angels, Monett Red Birds, Neosho Yankees |
| Bi-State League | D | Bassett Furnituremakers, Danville-Schoolfield Leafs, Leaksville-Draper-Spray Triplets, Martinsville Manufacturers, Mayodan Millers, Mount Airy Graniteers, Reidsville Luckies, South Boston Wrappers |
| Coastal Plain League | D | Goldsboro Goldbugs, Greenville Greenies, Kinston Eagles, New Bern Bears, Snow Hill Billies, Tarboro Serpents/Goobers, Williamston Martins, Wilson Tobs |
| Eastern Shore League | D | Cambridge Cardinals, Centreville Colts, Dover Orioles, Easton Yankees, Federalsburg A's, Milford Giants, Pocomoke City Red Sox, Salisbury Senators |
| Evangeline League | D | Abbeville A's, Alexandria Aces, Jeanerette Blues, Lafayette White Sox, Lake Charles Skippers, New Iberia Cardinals, Opelousas Indians, Rayne Rice Birds |
| Florida State League | D | Daytona Beach Islanders, DeLand Red Hats, Gainesville G-Men, Leesburg Anglers, Orlando Senators, Palatka Azaleas, Sanford Lookouts, St. Augustine Saints |
| Georgia-Florida League | D | Albany Cardinals, Americus Pioneers, Cordele Bees, Moultrie Packers, Tallahassee Capitals, Thomasville Orioles, Valdosta Trojans, Waycross Bears |
| Kentucky-Illinois-Tennessee League | D | Bowling Green Barons, Fulton Tigers, Hopkinsville Hoppers, Jackson Generals, Mayfield Browns, Owensboro Oilers, Paducah Indians, Union City Greyhounds |
| Mountain State League | D | Ashland Colonels, Bluefield Blue-Grays, Huntington Boosters, Logan Indians, Welch Miners, Williamson Red Birds |
| North Carolina State League | D | Concord Weavers, Cooleemee Cools, Kannapolis Towelers, Landis Senators, Lexington Indians, Mooresville Moors, Salisbury Giants, Thomasville Tommies |
| Northeast Arkansas League | D | Caruthersville Pilots, Jonesboro White Sox, Newport Tigers, Paragould Browns |
| Northern League | D | Crookston Pirates, Duluth Dukes, Eau Claire Bears, Fargo-Moorhead Twins, Grand Forks Chiefs, Superior Blues, Wausau Timberjacks, Winnipeg Maroons |
| Ohio State League | D | Findlay Oilers, Fostoria Red Birds, Fremont Green Sox, Lima Pandas, Mansfield Braves, Tiffin Mud Hens |
| Pennsylvania State Association | D | Beaver Falls Bees, Butler Yankees, Greensburg Senators, Johnstown Johnnies, McKeesport Little Pirates, Washington Red Birds |
| Pennsylvania-Ontario-New York League | D | Batavia Clippers, Bradford Bees, Hamilton Red Wings, Jamestown Jaguars, Niagara Falls Rainbows, Olean Oilers |
| Tar Heel League | D | Gastonia Cardinals, Hickory Rebels, Lenoir Indians, Newton-Conover Twins, Shelby Nationals, Statesville Owls |
| Virginia League | D | Harrisonburg Turks, Lynchburg Grays, Salem-Roanoke Friends, Staunton Presidents |
| West Texas-New Mexico League | D | Abilene Apaches/Borger Gassers, Amarillo Gold Sox, Big Spring Barons, Clovis Pioneers, Lamesa Lobos, Lubbock Hubbers, Midland Cowboys, Pampa Oilers |
| Western League | D | Lincoln Links, Mitchell Kernels, Norfolk Elks, Sioux City Cowboys, Sioux Falls Canaries, Worthington Cardinals |
| | |
| Cuban League | Foreign | |
| Japanese Baseball League | Foreign | Eagles, Hankyu, Lion, Nagoya, Nagoya Kinko, Nakai, Osaka Tigers, Tokyo Kyojin,
Tokyo Senators |
| | |
| Mexican League | Independent | Anahuac Indios, Cordoba Cafeteros, Mexico City Comintra, Monterrey Industriales, Nuevo Laredo Tecolotes, Santa Rosa Gallos, Tampico Alijadores, Torreon Algodoneros,
Veracruz Aguila |
| Quebec Provincial League | Independent | Drummondville Tigers, Granby Red Sox, Quebec Athletics, Sherbrooke Braves, Sorel, St. Hyacinthe Saints, Trois-Rivieres |
| | |
| Negro American League | Negro Majors | Chicago American Giants, Cleveland Bears, Indianapolis ABCs, Kansas City Monarchs, Memphis Red Sox, St. Louis Stars, Toledo Crawfords |
| 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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