Geography Columbia is located at 38°26′57″N, 90°12′31″W (38.449172, -90.208500).2 According to the United States Census Bureau, the city has a total area of 9.4 square miles (24.4 km²), of which, 9.4 square miles (24.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.21%) is water. Columbia is bounded on the west by the Mississippi River. Running in a diagonal line just northeast of Columbia, is the border of St. Clair County, beyond which lies Dupo to the north and Millstadt to the east. To the south is Waterloo, Waterloo and Columbia are expected to grow right up to the borders of the other, in effect extending St. Louis' urban sprawl from South St. Louis County arcross the Jefferson Barracks Bridge south and into the heart of the formerly rural Monroe County. Demographics As of the census3 of 2000, there were 7,922 people. A special census conducted in 2006 places the population at 9,8184, 3,112 households, and 2,218 families residing in the city. The population density was 841.5 people per square mile (325.0/km²). There were 3,219 housing units at an average density of 341.9/sq mi (132.1/km²). The racial makeup of the city was 98.52% White, 0.10% African American, 0.19% Native American, 0.34% Asian, 0.20% from other races, and 0.64% from two or more races. Hispanic or Latino of any race were 0.96% of the population. There were 3,112 households out of which 35.9% had children under the age of 18 living with them, 61.3% were married couples living together, 7.2% had a female householder with no husband present, and 28.7% were non-families. 25.4% of all households were made up of individuals and 10.9% 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 3.01. In the city the population was spread out with 25.9% under the age of 18, 6.2% from 18 to 24, 32.0% from 25 to 44, 20.6% from 45 to 64, and 15.2% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 93.5 males. For every 100 females age 18 and over, there were 88.6 males. The median income for a household in the city was $58,003, and the median income for a family was $69,059. Males had a median income of $46,197 versus $31,042 for females. The per capita income for the city was $26,767. About 2.0% of families and 2.5% of the population were below the poverty line, including 2.3% of those under age 18 and 4.4% of those age 65 or over.
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