Mid-State Conference (IHSAA) Membership Membership

| School | Location_ | Mascot | Enrollment | IHSAA_Class | County | Year_Joined | Previous_Conference |
|---|---|---|---|---|---|---|---|
| Decatur Central | Indianapolis, IN | Hawks | 1856 | AAAAA | 49 Marion | 2006 | Conference Indiana |
| Franklin | Franklin, IN | Grizzly Cubs | 1592 | AAAAA | 41 Johnson | 1981 | South Central |
| Greenwood | Greenwood, IN | Woodmen | 1389 | AAAA | 41 Johnson | 1942 | independent |
| Martinsville | Martinsville, IN | Artesians | 2012 | AAAAA | 55 Morgan | 2006 | Conference Indiana |
| Mooresville | Mooresville, IN | Pioneers | 1428 | AAAA | 55 Morgan | 1942 | independent |
| Plainfield | Plainfield, IN | Quakers | 1304 | AAAA | 32 Hendricks | 1942 | independent |
| Whiteland | Whiteland, IN | Warriors | 1785 | AAAAA | 41 Johnson | 1968 | Mid-Hoosier |