Black Diamond Conference Current members Current members

| School | Location_Population | Nicknames | Colors | Years_Member | Enrollment_2013_14 |
|---|---|---|---|---|---|
| Eastern Division | Eastern Division | Eastern Division | Eastern Division | Eastern Division | Eastern Division |
| Carmi-White County High School | Carmi, Illinois (5,240) | Bulldogs Lady Bulldogs | Maroon White | 2003–Present | 375 |
| Eldorado High School | Eldorado, Illinois (4,122) | Eagles | Purple Gold | 1992-2003 (affiliate) 2003–Present | 355 |
| Fairfield Community High School | Fairfield, Illinois (5,154) | Mules Lady Mules | Red Black | 2003–Present | 402 |
| Hamilton County Senior High School | McLeansboro, Illinois (2,883) | Foxes Lady Foxes | Kelly Green White | 1990-2003 (affiliate) 2003–Present | 333 |
| Johnston City High School | Johnston City, Illinois (3,543) | Indians Lady Indians | Red Black | 1975–Present | 328 |
| Vienna High School | Vienna, Illinois (1,434) | Eagles Lady Eagles | Royal Blue Orange | 2008–Present | 324 |