Columbia County
Founded: November 11, 1875 |
Columbia County
Sheriff's Office
341 East Main Street
Dayton, WA 99328
Phone: 509.382.1100
Web Site
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Columbia County is named after the Columbia River. It is
part of the Palouse, a wide and rolling prairie-like region
of the middle Columbia basin. The county seat is at Dayton,
which is also the county's largest city. As of 2007, the
estimated population was 4,100.
Columbia County was created out of Walla Walla County on
November 11, 1875.
According to the U.S. Census Bureau, the county has a total
area of 874 square miles, of which, 869 square miles of it
is land and 5 square miles of it (0.54%) is water. The
population density is 5 per square mile.
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