Columbia County is located in southeast Washington. The County Seat is Dayton and the largest city is Dayton. The Official Web Site is located at http://www.columbiaco.com . The 2014 population estimate is 3,985 and the 2010 census population was 4,078. The land area is 868.63 square miles and there are 4.7 persons per square mile.
94.4% of the population is White, 0.5% is Black or African American, 6.3% is Hispanic or Latino, 0.7% is Asian, 1.7% is American Indian or Alaska Native, 0.3% is Native Hawaiian or Pacific Islander, and 2.4% is two or more races. 86.1% have a high school degree or higher, and 17.2% have a Bachelor degree or higher.
The median home value is $147,900, there are 1,651 households, an average of 2.39 persons per household. The per capita income is $23,814, the median household income is $42,519, and 17.1% of the persons in Columbia County are considered below poverty level.
The total number of firms, at last estimate, was 298. Retail sales (in $1000) were $28,894, and sales per capita were $7,308.
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