Northern Indiana Athletic Conference Former members Former members

| School | Location_ | Mascot | County | Joined | Previous_Conference | Left_ | Conference_joined |
|---|---|---|---|---|---|---|---|
| East Chicago Washington * | East Chicago | Senators | 45 Lake | 1927 | Independents | 1963 | Northwestern |
| Gary Emerson | Gary | Golden Tornadoes | 45 Lake | 1927 | Independents | 1963 | Northwestern |
| Gary Froebel | Gary | Blue Devils | 45 Lake | 1927 | Independents | 1963 | Northwestern |
| Gary Mann | Gary | Horsemen | 45 Lake | 1927 | Independents | 1963 | Northwestern |
| Goshen | Goshen | Redskins | 20 Elkhart | 1927 | Independents | 1969 | Independents |
| Hammond | Hammond | Wildcats | 45 Lake | 1927 | Independents | 1963 | Northwestern |
| La Porte | LaPorte | Slicers | 46 La Porte | 1927 | Independents | 1976 | Duneland |
| Michigan City Elston * | Michigan City | Red Devils | 46 La Porte | 1927 | Independents | 1995 | none (consolidated into Michigan City ) |