Columbia City is a city in Columbia County, Oregon, United States. It was named for its location on the Columbia River. The population was 1,946 at the 2010 census.
According to the United States Census Bureau, the city has a total area of 1.15 square miles (2.98 km), of which, 0.77 square miles (1.99 km) is land and 0.38 square miles (0.98 km) is water.
As of the census of 2010, there were 1,946 people, 787 households, and 601 families residing in the city. The population density was 2,527.3 inhabitants per square mile (975.8/km). There were 830 housing units at an average density of 1,077.9 per square mile (416.2/km). The racial makeup of the city was 94.6% White, 0.1% African American, 1.0% Native American, 1.5% Asian, 0.1% Pacific Islander, 1.0% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 3.0% of the population.
There were 787 households of which 26.4% had children under the age of 18 living with them, 64.2% were married couples living together, 8.3% had a female householder with no husband present, 3.9% had a male householder with no wife present, and 23.6% were non-families. 18.4% of all households were made up of individuals and 7.9% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.74.
The median age in the city was 48.4 years. 18.6% of residents were under the age of 18; 6.7% were between the ages of 18 and 24; 20.4% were from 25 to 44; 36% were from 45 to 64; and 18.4% were 65 years of age or older. The gender makeup of the city was 48.8% male and 51.2% female.
As of the census of 2000, there were 1,571 people, 595 households, and 448 families residing in the city. The population density was 2,106.6 people per square mile (808.8/km²). There were 640 housing units at an average density of 858.2 per square mile (329.5/km²). The racial makeup of the city was 95.61% White, 0.38% African American, 1.34% Native American, 0.70% Asian, 0.51% from other races, and 1.46% from two or more races. Hispanic or Latino of any race were 2.04% of the population. 19.9% were of German, 11.9% English, 11.0% Irish, 7.9% American, 6.5% Norwegian and 5.3% Scottish ancestry according to Census 2000.
There were 595 households out of which 32.9% had children under the age of 18 living with them, 67.2% were married couples living together, 5.4% had a female householder with no husband present, and 24.7% were non-families. 19.0% of all households were made up of individuals and 7.6% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 2.97.
In the city, the population was spread out with 25.8% under the age of 18, 6.0% from 18 to 24, 25.5% from 25 to 44, 30.6% from 45 to 64, and 12.2% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 105.4 males. For every 100 females age 18 and over, there were 99.0 males.
The median income for a household in the city was $59,545, and the median income for a family was $62,596. Males had a median income of $46,964 versus $33,125 for females. The per capita income for the city was $25,266. About 2.8% of families and 4.5% of the population were below the poverty line, including 5.1% of those under age 18 and 3.7% of those age 65 or over.