The Southern Illinois League permanently folded during the 1910 season, with the McLeansboro Merchants in first place.
[3][4][5][6][7] After beginning play, the Southern Illinois League lost a team when the Mount Vernon Merchants disbanded on June 30, 1910.
After continuing play, the Southern Illinois League permanently folded on July 11, 1910.
[3][4] In the final 1910 standings, the McLeansboro Merchants had a record of 20–5 when the league folded to finish in first place.
Harrisburg and McLeansboro joined the Kitty League July 24.