Columbiana is a city in Shelby County, Alabama, United States. At the 2010 census the population was 4,197. The city is the county seat of Shelby County.
Columbiana is located at 33°11′1″N 86°36′34″W (33.183545, -86.609365).
According to the U.S. Census Bureau, the city has a total area of 15.2 square miles (39.4 km²), of which 15.2 square miles (39.3 km²) is land and 0.04 square mile (0.1 km²) (0.26%) is water.
As of the census of 2000, there were 3,316 people, 1,260 households, and 868 families residing in the city. The population density was 218.5 people per square mile (84.3/km²). There were 1,372 housing units at an average density of 90.4 per square mile (34.9/km²). The racial makeup of the city was 78.59% White, 19.60% Black or African American, 0.24% Native American, 0.15% Asian, 0.03% Pacific Islander, 0.66% from other races, and 0.72% from two or more races. 1.99% of the population were Hispanic or Latino of any race.
There were 1,260 households out of which 34.0% had children under the age of 18 living with them, 51.8% were married couples living together, 13.4% had a female householder with no husband present, and 31.1% were non-families. 29.2% of all households were made up of individuals and 12.9% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.10.
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