[1] The league began play in 1922 with six teams: the Cedar Rapids Bunnies, Marshalltown Ansons, Rock Island Islanders, Waterloo Hawks, Ottumwa Cardinals and the Dubuque Climbers.
[3][4] In 1924, the league expanded to eight teams, adding the Moline Plowboys and Burlington Bees.
The Marshalltown Ansons and Ottumwa Packers left the league and were replaced by the Keokuk Indians and Davenport Blue Sox.
[10] All teams from 1929 returned for 1930, with the Bunnies finishing in first place for the third time in league history.
It also moved up in rank from Class-D to Class-B, and saw three new arrivals (Peoria Tractors, Quincy Indians, Springfield Senators) as well as multiple departures (Burlington Bees, Cedar Rapids Bunnies, Moline Plowboys, Waterloo Hawks, Dubuque Tigers).
The Blue Sox finished in first place and defeated the Islanders four games to one in the playoffs to become league champions.
[15] The Blue Sox finished the season 82-32, as Como Cotelle hit .407 and Ed Hall drove in 151 runs.
1933 Mississippi Valley League schedule Playoffs: Davenport 4 games, Rock Island 1 [4]