Callahan
Market InsightsCallahan is a town in Nassau County, Florida, United States, adjacent to Duval County. The population was 962 at the 2000 census. It is one location of the Northeast Florida Fair.
Callahan is a town in Nassau County, Florida, United States, adjacent to Duval County. The population was 962 at the 2000 census. It is one location of the Northeast Florida Fair.