Callahan is a town in Nassau County, Florida, United States, adjacent to Duval County. The population was 1,123 at the 2010 census. It is one location of the Northeast Florida Fair.
The Battle of Alligator Bridge took place around Callahan on June 30, 1778, and was the only major engagement in an unsuccessful campaign to conquer British East Florida during the American Revolutionary War.
According to the United States Census Bureau, the town has a total area of 1.3 square miles (3.4 km2), all land.
At the 2000 census there were 962 people, 411 households, and 256 families living in the town. The population density was 724.9 inhabitants per square mile (279.3/km²). There were 444 housing units at an average density of 334.6 per square mile (128.9/km²). The racial makeup of the town was 85.86% White, 10.60% African American, 0.83% Native American, 0.21% Asian, 0.52% from other races, and 1.98% from two or more races. Hispanic or Latino of any race were 2.49%.Of the 411 households 33.6% had children under the age of 18 living with them, 37.0% were married couples living together, 20.7% had a female householder with no husband present, and 37.5% were non-families. 32.6% of households were one person and 16.3% were one person aged 65 or older. The average household size was 2.34 and the average family size was 2.95.
The age distribution was 28.4% under the age of 18, 12.4% from 18 to 24, 25.5% from 25 to 44, 20.9% from 45 to 64, and 12.9% 65 or older. The median age was 33 years. For every 100 females there were 78.5 males. For every 100 females age 18 and over, there were 74.9 males.
The median household income was $25,234 and the median family income was $32,167. Males had a median income of $27,422 versus $23,036 for females. The per capita income for the town was $14,710. About 14.8% of families and 21.9% of the population were below the poverty line, including 30.6% of those under age 18 and 18.7% of those age 65 or over.
Callahan Elementary and Callahan Intermediate Schools serve grades K-5, Callahan Middle School serves 6-8, and West Nassau High School has grades 9-12. Sonshine Christian Academy, a co-ed private school affiliated with the Assembly of God, instructs Pre-Kindergarten through 12th
Nassau County Public Library operates the Callahan Branch Library.
Nassau County Fire Rescue operates Station 50 in Callahan.
Howie Kendrick, Major League Baseball player for the Anaheim Angels, Los Angeles Dodgers and Washington Nationals.
Frank Murphy, former NFL player for the Chicago Bears, Tampa Bay Buccaneers and Houston Texans.