Callahan is a town in Nassau County, Florida, United States, adjacent to Duval County. The population was 1,526 at the 2020 census. It is one location of the Northeast Florida Fair.
Downtown Callahan
Nassau County is the northeasternmost county of the U.S. state of Florida. According to the July 2022 United States Census analysis, the county's population was 97,899.
Nassau County Courthouse
Robert M. Foster Justice Center in Yulee
Fernandina Beach
Hilliard