Illinois State League

The Illinois State League (ISL) was a baseball minor league formed in 1947. The Illinois State League operated in 1947–1948 and evolved to become today's Midwest League. The Class D league was composed entirely of new franchises, each located in Southern Illinois. The charter franchises were in the Illinois cities of Belleville, Centralia, Marion, Mattoon, Mount Vernon and West Frankfort.

Illinois State League

The Illinois State League (ISL) was a baseball minor league formed in 1947. The Illinois State League operated in 1947–1948 and evolved to become today's Midwest League. The Class D league was composed entirely of new franchises, each located in Southern Illinois. The charter franchises were in the Illinois cities of Belleville, Centralia, Marion, Mattoon, Mount Vernon and West Frankfort.