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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| Columbia County Official government website for Columbia County, Washington. |
| Agendas & Minutes Columbia County Commissioners meeting minutes & agendas. |
| Census | 1910 Washington Secretary of State Archives of Columbia County 1910 Federal census records. |
| Court Records Superior Court case records and judgments in Columbia County. |
| Court Records | Frontier Justice Archives of Columbia County Frontier Justice court cases between 1853 and 1889. |
| Inmates Columbia County Sheriff's Office inmate search. |
| Marriages Historical marriage records for Columbia County covering January 1876 through November 1912. |
| Naturalizations | 1908-1953 Columbia County petitions for naturalization filed 1908 through 1953. |
| Property | Assessments & Tax Columbia County Assessor & Treasurer property tax and assessment records. |
| Property | Sales Property sales comparables from the Columbia County Assessor & Treasurer's Offices. |
| Recorded Documents Columbia County Auditor recorded documents. Requires username and password issued by the Auditor's Office. |
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