Location in Nassau County and the state of Florida
|o Total||1.45 sq mi (3.77 km2)|
|o Land||1.45 sq mi (3.77 km2)|
|o Water||0.00 sq mi (0.00 km2)|
|Elevation||20 ft (6 m)|
|o Estimate (2016)||1,279|
|o Density||879.64/sq mi (339.62/km2)|
|Time zone||UTC-5 (Eastern (EST))|
|o Summer (DST)||UTC-4 (EDT)|
|GNIS feature ID||0279841|
Callahan is located at (30.560702, -81.830850).
According to the United States Census Bureau, the town has a total area of 1.3 square miles (3.4 km2), all land.
As of the census of 2000, there were 962 people, 411 households, and 256 families residing 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 population.
There were 411 households out of which 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 all households were made up of individuals and 16.3% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.95.
In the town, the population was spread out with 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% who were 65 years of age 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 income for a household in the town was $25,234, and the median income for a family 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.
Nassau County Fire Rescue operates Station 50 in Callahan.
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 grade
Nassau County Public Library operates the Callahan Branch Library.