Columbia is a town in Washington County, Maine, United States. The population was 486 at the 2010 census. According to the United States Census Bureau, the town has a total area of 36.61 square miles (94.82 km), of which, 36.30 square miles (94.02 km) of it is land and 0.31 square miles (0.80 km) is water.
As of the census of 2010, there were 486 people, 198 households, and 123 families residing in the town. The population density was 13.4 inhabitants per square mile (5.2/km). There were 290 housing units at an average density of 8.0 per square mile (3.1/km). The racial makeup of the town was 97.7% White, 0.2% Native American, 0.6% Asian, 1.2% from other races, and 0.2% from two or more races. Hispanic or Latino of any race were 2.5% of the population.
There were 198 households of which 32.3% had children under the age of 18 living with them, 46.0% were married couples living together, 11.1% had a female householder with no husband present, 5.1% had a male householder with no wife present, and 37.9% were non-families. 29.3% of all households were made up of individuals and 10.6% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.03.
The median age in the town was 40 years. 24.9% of residents were under the age of 18; 7% were between the ages of 18 and 24; 25.2% were from 25 to 44; 32.5% were from 45 to 64; and 10.5% were 65 years of age or older. The gender makeup of the town was 50.4% male and 49.6% female.
As of the census of 2000, there were 459 people, 190 households, and 122 families residing in the town. The population density was 12.8 per square mile (4.9/km² ). There were 267 housing units at an average density of 7.4 per square mile (2.9/km²). The racial makeup of the town was 98.69% White, 0.22% Native American, and 1.09% from two or more races.
There were 190 households out of which 32.6% had children under the age of 18 living with them, 44.7% were married couples living together, 14.7% had a female householder with no husband present, and 35.3% were non-families. 26.8% of all households were made up of individuals and 8.9% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.89.
In the town, the population was spread out with 24.6% under the age of 18, 8.3% from 18 to 24, 34.4% from 25 to 44, 23.1% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 97.0 males. For every 100 females age 18 and over, there were 95.5 males.
The median income for a household in the town was $28,125, and the median income for a family was $31,818. Males had a median income of $28,750 versus $22,000 for females. The per capita income for the town was $14,537. About 18.3% of families and 21.8% of the population were below the poverty line, including 35.5% of those under age 18 and 17.4% of those age 65 or over.