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Demographics

As of the census of 2000, there were 88,254 people, 34,199 households, and 23,118 families residing in the CDP. The population density was 3,202.0 people per square mile (1,236.4/km2). There were 35,281 housing units at an average density of 1,280.0 per square mile (494.3/km2). The racial makeup of the CDP was 66.52% White, 21.47% Black or African American, 0.26% Native American, 7.30% Asian, 0.05% Pacific Islander, 1.63% from other races, and 2.76% from two or more races. 4.12% of the population were Hispanic or Latino of any race. 14% of Columbia’s residents were German, 11% Irish, 10% English, 5% Italian, 4% Polish, 2% Russian, 2% Scottish, 2% Indian, 2% Chinese, 2% Korean, 2% Sub-Saharan African, 2% French, and 2% West Indian.

There were 34,199 households, out of which 35.9% had children under the age of 18 living with them, 53.4% were married couples living together, 11.2% had a female householder with no husband present, and 32.4% were non-families. 25.6% of all households were made up of individuals, and 5.1% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.09.

In the CDP, the population was spread out, with 26.3% under the age of 18, 6.7% from 18 to 24, 34.1% from 25 to 44, 25.5% from 45 to 64, and 7.5% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 93.1 males. For every 100 females age 18 and over, there were 88.7 males.