The Capital District Conference in Indiana. Counties in red contained schools at the time of disbanding, counties in pink contained former member schools who left before conference folded.
The Capital District Conference was an IHSAA-sanctioned conference from 1945 to 1971. Made up of Indianapolis area schools, it included smaller suburban schools and private schools until the growth of the suburban Indianapolis area had caused the public schools to grow larger. These schools eventually sought out similar-sized schools to compete with, and by 1971, these schools became the nucleus of the Central Suburban Conference, as more suburban public schools joined, with the smaller private schools dropping out to become independent.