| 2013 (5 teams) | Fresno | Richmond | San Jose | Augusta | Salem-Keizer | | | |
| 2012 (7 teams) | Fresno | Richmond | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2011 (7 teams) | Fresno | Richmond | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2010 (7 teams) | Fresno | Richmond | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2009 (7 teams) | Fresno | Connecticut | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2008 (7 teams) | Fresno | Connecticut | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2007 (7 teams) | Fresno | Connecticut | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2006 (7 teams) | Fresno | Connecticut | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2005 (7 teams) | Fresno | Norwich | San Jose | Augusta | Salem-Keizer | Giants | Giants | |
| 2004 (7 teams) | Fresno | Norwich | San Jose | Hagerstown | Salem-Keizer | Giants | Giants | |
| 2003 (7 teams) | Fresno | Norwich | San Jose | Hagerstown | Salem-Keizer | Giants | Giants | |
| 2002 (7 teams) | Fresno | Shreveport | San Jose | Hagerstown | Salem-Keizer | Giants | Giants | |
| 2001 (7 teams) | Fresno | Shreveport | San Jose | Hagerstown | Salem-Keizer | Giants | Giants | |
| 2000 (7 teams) | Fresno | Shreveport | Bakersfield, San Jose | | Salem-Keizer | Giants | Giants | |
| 1999 (6 teams) | Fresno | Shreveport | Bakersfield, San Jose | | Salem-Keizer | | Giants | |
| 1998 (6 teams) | Fresno | Shreveport | San Jose, Bakersfield | | Salem-Keizer | | Giants | |
| 1997 (6 teams) | Phoenix | Shreveport | San Jose, Bakersfield | | Salem-Keizer | | Giants | |
| 1996 (6 teams) | Phoenix | Shreveport | San Jose | Burlington | Bellingham | | Giants | |
| 1995 (6 teams) | Phoenix | Shreveport | San Jose | Burlington | Bellingham | | Giants | |
| 1994 (6 teams) | Phoenix | Shreveport | San Jose | Clinton | Everett | Giants | | |
| 1993 (6 teams) | Phoenix | Shreveport | San Jose | Clinton | Everett | Giants | | |
| 1992 (7 teams) | Phoenix | Shreveport | San Jose | Clinton | Everett | Giants | Giants | |
| 1991 (7 teams) | Phoenix | Shreveport | San Jose | Clinton | Everett | Giants | Giants | |
| 1990 (6 teams) | Phoenix | Shreveport | San Jose | Clinton | Everett | | Giants | |
| 1989 (6 teams) | Phoenix | Shreveport | | Clinton, San Jose | Everett | Pocatello | | |
| 1988 (6 teams) | Phoenix | Shreveport | | Clinton, San Jose | Everett | Pocatello | | |
| 1987 (6 teams) | Phoenix | Shreveport | | Clinton, Fresno | Everett | Pocatello | | |
| 1986 (5 teams) | Phoenix | Shreveport | | Clinton, Fresno | Everett | | | |
| 1985 (5 teams) | Phoenix | Shreveport | | Fresno, Clinton | Everett | | | |
| 1984 (5 teams) | Phoenix | Shreveport | | Clinton, Fresno | Everett | | | |
| 1983 (5 teams) | Phoenix | Shreveport | | Clinton, Fresno | | Great Falls | | |
| 1982 (5 teams) | Phoenix | Shreveport | | Fresno, Clinton | | Great Falls | | |
| 1981 (5 teams) | Phoenix | Shreveport | | Fresno, Clinton | | Great Falls | | |
| 1980 (5 teams) | Phoenix | Shreveport | | Clinton, Fresno | | Great Falls | | |
| 1979 (5 teams) | Phoenix | Shreveport | | Cedar Rapids, Fresno | | Great Falls | | |
| 1978 (5 teams) | Phoenix | Waterbury | | Fresno, Cedar Rapids | | Great Falls | | |
| 1977 (6 teams) | Phoenix | Waterbury | | Fresno, Cedar Rapids | | Great Falls | | Giants |
| 1976 (6 teams) | Phoenix | Lafayette | | Fresno, Cedar Rapids | | Great Falls | | Giants |
| 1975 (6 teams) | Phoenix | Lafayette | | Cedar Rapids, Fresno | | Great Falls | | Giants |
| 1974 (6 teams) | Phoenix | Amarillo | | Decatur, Fresno | | Great Falls | | Giants |
| 1973 (6 teams) | Phoenix | Amarillo | | Decatur, Fresno | | Great Falls | | Giants |
| 1972 (6 teams) | Phoenix | Amarillo | | Fresno, Decatur | | Great Falls | | Giants |
| 1971 (6 teams) | Phoenix | Amarillo | | Fresno, Decatur | | Great Falls | | Giants |
| 1970 (6 teams) | Phoenix | Amarillo | | Fresno, Decatur | | Great Falls | | Giants |
| 1969 (6 teams) | Phoenix | Amarillo | | Fresno, Decatur | | Great Falls | | Giants |
| 1968 (8 teams) | Phoenix | Amarillo | | Fresno, Decatur | Medford | Salt Lake City | | Giants, Giants |
| 1967 (8 teams) | Phoenix | Waterbury | | Fresno, Decatur | Medford | Salt Lake City | | Giants, Giants |
| 1966 (8 teams) | Phoenix | Waterbury | | Decatur, Lexington, Fresno | | Magic Valley | | Giants, Giants |
| 1965 (8 teams) | Tacoma | Springfield | | Lexington, Decatur, Fresno | | Magic Valley | | Giants, Giants |
| 1964 (9 teams) | Tacoma | Springfield, El Paso | | Decatur, Fresno, Lexington | | Magic Valley | | Giants, Giants |
| 1963 (9 teams) | Tacoma | El Paso, Springfield | | Lexington, Decatur, Fresno | | Salem | | Giants, Giants |
| 1962 (10 teams) | Tacoma | El Paso | | Springfield | | | | Giants, Decatur, Fresno, Lakeland, Giants, Eugene, Salem |
| 1961 (11 teams) | Tacoma | Rio Grande Valley/Victoria | | Springfield | | | | Belmont, Fresno, Eugene, Salem, Giants, El Paso, Giants, Quincy |
| 1960 (11 teams) | Tacoma | Rio Grande Valley | | Springfield | | | | Giants, Artesia, Quincy, Giants, Eugene, Pocatello, Fresno, Salem |
| 1959 (11 teams) | Phoenix | Corpus Christi | | Springfield | | | | Eugene, Fresno, Giants, Giants, St. Cloud, Hastings, Artesia, Michigan City |
| 1958 (10 teams) | Phoenix | Corpus Christi | | Springfield | | | | Panama City, Michigan City, St. Cloud, Danville, Fresno, Hastings, Artesia |
| 1957 (9 teams) | Minneapolis | Dallas | | Springfield | | | | Danville, Muskogee, St. Cloud, Selma, Hastings, Michigan City |
| 1956 (12 teams) | Minneapolis | Dallas | | Albuquerque, Johnstown | | | | Lake Charles, Michigan City, Cocoa, Danville, St. Cloud, Sandersville, Hastings, Muskogee |
| 1955 (10 teams) | Minneapolis | Dallas | | Wilkes-Barre/Johnstown, Sioux City | | | | El Dorado, Danville, St. Cloud, Sandersville, Mayfield, Muskogee |
| 1954 (10 teams) | Minneapolis | Nashville | | Sioux City | | | | Olean, St. Cloud, Danville, Danville, Muskogee, Mayfield, Shelby |
| 1953 (9 teams) | Minneapolis | Nashville | | Sioux City | | | | Pauls Valley, Muskogee, Oshkosh, Mayfield, St. Cloud, Danville |
| 1952 (14 teams) | Minneapolis | Nashville | | Jacksonville, Sioux City | | | | Sunbury, Big Stone Gap, Moultrie, Statesville, Kingsport, Muskogee, St. Cloud, Knoxville, Oshkosh, Pauls Valley |
| 1951 (15 teams) | Ottawa, Minneapolis | | | Jacksonville, Sioux City | | | | Knoxville, Sunbury, Bristol, Idaho Falls, Lenoir, St. Cloud, Muskogee, Lawton, Oshkosh, Springfield, Sanford |
| 1950 (20 teams) | Minneapolis, Jersey City | | | Jacksonville, Sioux City | | | | Bristol, Trenton, Oshkosh, Galax, Lawton, Springfield, Idaho Falls, Sanford, St. Cloud, Medford, Richmond, Vicksburg, Lenoir, Knoxville, Erie, Enid |
| 1949 (19 teams) | Minneapolis, Jersey City | | | Jacksonville, Sioux City | | | | Richmond, Reno, Lenoir, Bristol, Springfield, Oshkosh, Sanford, St. Cloud, Erie, Lawton, Fort Smith, Trenton, Idaho Falls, Hickory, Knoxville |
| 1948 (21 teams) | Jersey City, Minneapolis | | | Sioux City, Jacksonville | | | | Fort Smith, Chanute, St. Cloud, Reno, Seaford, Sanford, Springfield, Knoxville, Trenton, Erie, Bristol, Oshkosh, Richmond, Ogdensburg, Hickory, Lawton, Quebec |
| 1947 (17 teams) | Jersey City, Minneapolis | | | Sioux City, Jacksonville | | | | Oshkosh, Danville, Hickory, Manchester, Trenton, Seaford, Bristol, Richmond, Fort Smith, Peekskill, Reno, Erie, Springfield |
| 1946 (17 teams) | San Francisco, Minneapolis, Jersey City | | | Jacksonville | | | | Manchester, Bristol, Hickory, Oshkosh, Springfield, Fort Smith, Richmond, Peekskill, St. Cloud, Trenton, Erie, Danville, Anderson |
| 1945 (8 teams) | | Jersey City, San Francisco | | | | | | Richmond, Hickory, Erie, Springfield, Bristol, Danville |
| 1944 (5 teams) | | Jersey City | | | | | | Erie, Springfield, Richmond, Bristol |
| 1943 (3 teams) | | Jersey City | | Springfield | | | | Bristol |
| 1942 (7 teams) | | Jersey City | | | | | | Bristol, Salisbury, Oshkosh, Oklahoma City, Jacksonville, Fort Smith |
| 1941 (6 teams) | | Jersey City | | | | | | San Bernardino, Salisbury, Clinton, Fort Smith, Milford |
| 1940 (7 teams) | | Jersey City | | | | | | Knoxville, Milford, Clinton, Richmond, Salisbury, Fort Smith |
| 1939 (5 teams) | | Jersey City | | | | | | Salisbury, Fort Smith, Clinton, Milford |
| 1938 (5 teams) | | Jersey City | | | | | | Richmond, Fort Smith, Milford, Blytheville |
| 1937 (5 teams) | | Jersey City | | | | | | Richmond, Greenwood, Crisfield, Blytheville |
| 1936 (5 teams) | | | | | | | | Memphis, Tyler, Greenwood, Tallahassee, Muskogee |
| 1935 (4 teams) | | | | Nashville | | | | Tallahassee, Abbeville, Tyler |
| 1934 (2 teams) | | | | Nashville | | | | Jacksonville |
| 1933 (1 team) | | | | | | | | Attleboro/Lawrence/Woonsocket |
| 1932 (2 teams) | | | | Bridgeport | | | | Winston-Salem/High Point |