In 1976 the Midwest League contracted from ten teams to eight when teams in Danville and Dubuque were eliminated. In 1982 the league expanded to 12 teams by adding the Beloit Brewers, the Danville Suns, the Madison Muskies, and the Springfield Cardinals. The Peoria Suns replaced the Danville Suns in 1983, and acquired their current name, Peoria Chiefs, the following year. The league began splitting its season into two halves and expanded to the present 14 teams in 1988 with the addition of franchises in South Bend, Indiana, and Rockford, Illinois. During the 1990s several teams changed cities as Major League Baseball placed higher standards on minor league baseball facilities; franchises in smaller cities were sold to new owners who moved those teams to new ballparks in larger cities. Kenosha, Madison, Rockford, Springfield, Waterloo, and Wausau lost teams during this decade while Battle Creek, Dayton, Fort Wayne, Grand Rapids (West Michigan), Kane County, and Lansing gained teams.
The Fort Wayne Wizards are the oldest franchise in the league, having begun as the Mattoon Indians in 1947 and playing in Keokuk, Iowa, Wisconsin Rapids, Wisconsin, and Kenosha, Wisconsin before moving to Fort Wayne, Indiana, in 1993. The Clinton LumberKings have been in one city longer than any Midwest League team, having called Clinton, Iowa, home since 1954.
On September 2, 2008, Minor League Baseball announced that two teams would be transferring from the fellow Class A South Atlantic League to the Midwest League. These two teams are the Lake County Captains (an affiliate of the Cleveland Indians playing in Eastlake, Ohio) and a future team in Bowling Green, Kentucky (the former Columbus Catfish in Columbus, Georgia).
|Eastern||Dayton Dragons||Cincinnati Reds||Dayton, Ohio||Fifth Third Field||8,200|
|Fort Wayne TinCaps||San Diego Padres||Fort Wayne, Indiana||Parkview Field||6,500-9,000|
|Great Lakes Loons||Los Angeles Dodgers||Midland, Michigan||Dow Diamond||5,500|
|Lansing Lugnuts||Toronto Blue Jays||Lansing, Michigan||Oldsmobile Park||11,000|
|South Bend Silver Hawks||Arizona Diamondbacks||South Bend, Indiana||Stanley Coveleski Regional Stadium||5,000|
|West Michigan Whitecaps||Detroit Tigers||Comstock Park, Michigan||Fifth Third Ballpark||11,123|
|Western||Beloit Snappers||Minnesota Twins||Beloit, Wisconsin||Harry C. Pohlman Field||3,501|
|Burlington Bees||Kansas City Royals||Burlington, Iowa||Community Field||3,500|
|Cedar Rapids Kernels||Los Angeles Angels of Anaheim||Cedar Rapids, Iowa||Veterans Memorial Stadium||5,300|
|Clinton LumberKings||Seattle Mariners||Clinton, Iowa||Alliant Energy Field1||4,000|
|Kane County Cougars||Oakland Athletics||Geneva, Illinois||Philip B. Elfstrom Stadium||7,400|
|Peoria Chiefs||Chicago Cubs||Peoria, Illinois||O'Brien Field||7,377|
|Quad Cities River Bandits||St. Louis Cardinals||Davenport, Iowa||Modern Woodmen Park||4,024|
|Wisconsin Timber Rattlers||Milwaukee Brewers||Grand Chute, Wisconsin||Time Warner Cable Field at Fox Cities Stadium||5,500|
|Bowling Green||Tampa Bay Rays||Bowling Green, Kentucky||Bowling Green Ballpark||4,000|
|Lake County Captains||Cleveland Indians||Eastlake, Ohio||Classic Park||7,273|