The Bi-County Conference was a high school conference in western central Illinois. The conference par in athletics and activities in the Illinois High School Association (IHSA). The conference comprised nine public high schools with small enrollments in portions of Fulton, Hancock, Henderson, McDonough, and Warren counties.
| School | Location | Mascot | Colors | Enrollment | IHSA Classes 2/3/4[1] | IHSA Music Class[2] | IHSA Football Class[3] | IHSA Cheerleading Class | |
|---|---|---|---|---|---|---|---|---|---|
| Avon High School | Avon, IL | Trojans | 70 | A/1A/1A | D | 1A | Small squad | ||
| Dallas City High School | Dallas City, IL | Bulldogs | 154 | A/1A/1A | D | 1A | Small squad | ||
| La Harpe High School | La Harpe, IL | Eagles | 150 | A/1A/2A | D | 1A | Small squad | ||
| Northwestern High School | Sciota, IL | Huskies | 100 | A/1A/1A | D | 1A | Small squad | ||
| Roseville High School | Roseville, IL | Panthers | 229 | A/1A/1A | D | 1A | Small squad | ||
| Southern High School | Stronghurst, IL | Rebels | 100 | A/1A/1A | D | 1A | Small squad | ||
| Union High School | Biggsville, IL | Yankees | 200 | A/1A/1A | D | 1A | Small squad | ||
| Monmouth, IL | Warriors | 100 | A/1A/1A | D | 1A | Small squad | |||
| Yorkwood High School | Monmouth, IL | Golden Bears | 100 | A/1A/1A | D | 1A | Small squad | ||
| Alexis High School | Alexis, IL | Cardinals | 120 | A/1A/1A | Small squad |
The conference originally consisted of nine schools. It was believed to have been formed in the 1970s at some point. The conference was very competitive. All of these schools were small schools. In the 1990s, La Harpe and Northwestern formed a co-op (the Thunder), which would ultimately cause the demise of the conference. Soon after, Dallas City would leave the conference, as would Roseville; however, the Bi-County would acquire Spoon River Valley and Alexis. 1997-98 was the final year of the conference. La Harpe-Northwestern won the football title that year. As of now, Northwestern and Colchester have consolidated to form West Prairie High School. Avon High School has co-oped with Abingdon High School. Dallas City has consolidated with La Harpe and Carthage to form Illini West High School. Roseville and Monmouth have consolidated to form Monmouth-Roseville High School. Southern High School and Union High School have consolidated to form West Central High School. Yorkwood, Alexis, and Warren have consolidated to form United High School.