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Columbia County, Washington facts for kids

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Columbia County
Columbia County Courthouse in Dayton
Columbia County Courthouse in Dayton
Official seal of Columbia County
Seal
Map of Washington highlighting Columbia County
Location within the U.S. state of Washington
Map of the United States highlighting Washington
Washington's location within the U.S.
Country  United States
State  Washington
Founded November 11, 1875
Named for Columbia River
Seat Dayton
Largest city Dayton
Area
 • Total 873 sq mi (2,260 km2)
 • Land 869 sq mi (2,250 km2)
 • Water 4.9 sq mi (13 km2)  0.6%%
Population
 (2020)
 • Total 3,952
 • Estimate 
(2023)
4,053 Increase
 • Density 4.6/sq mi (1.8/km2)
Time zone UTC−8 (Pacific)
 • Summer (DST) UTC−7 (PDT)
Congressional district 5th

Columbia County is a county in the state of Washington. It was created on November 11, 1875. The county is named after the Columbia River, even though the river doesn't flow through it.

In 2020, about 3,952 people lived here. This makes it one of the least populated counties in Washington. The main city and county seat is Dayton. Columbia County is part of the larger Walla Walla area.

Geography

Columbia County covers about 873 square miles. Most of this area is land, with a small part being water. It is part of a large, rolling prairie-like area called the Palouse. This region is found in the middle of the Columbia River basin.

Geographic features

Major roads

  • US 12
    U.S. Route 12 sign
    U.S. Route 12 is an important road here.

Neighboring counties

Columbia County shares borders with several other counties:

Protected natural areas

  • Part of the Umatilla National Forest is located in Columbia County.

Population Information

Historical population
Census Pop.
1880 7,103
1890 6,709 −5.5%
1900 7,128 6.2%
1910 7,042 −1.2%
1920 6,093 −13.5%
1930 5,325 −12.6%
1940 5,549 4.2%
1950 4,860 −12.4%
1960 4,569 −6.0%
1970 4,439 −2.8%
1980 4,057 −8.6%
1990 4,027 −0.7%
2000 4,064 0.9%
2010 4,078 0.3%
2020 3,952 −3.1%
2023 (est.) 4,053 −0.6%
U.S. Decennial Census
1790–1960 1900–1990
1990–2000 2010–2020

2010 Census details

In 2010, there were 4,078 people living in Columbia County. Most people (93%) were white. About 6.2% of the population was of Hispanic or Latino background.

The average age in the county was about 48.3 years old. There were 1,762 households. About 24.7% of these households had children under 18 living with them.

Towns and cities

City

  • Dayton (This is the main city and where the county government is.)

Town

Other communities

Old towns

Education

Schools

Several school districts serve parts of Columbia County:

  • Dayton School District
  • Pomeroy School District
  • Prescott School District
  • Starbuck School District
  • Waitsburg School District

Library

The Columbia County Rural Library District runs the only public library in the county, located in Dayton. It started in 1919 as a small reading room. Women in the community worked to raise money for a permanent building. In 1937, a public library was built using special funding. It was made bigger in 1947.

In November 2023, there was a community discussion about the future of the rural library district and the library itself. If the district were to close, the library's collection would go to the Washington State Library.

See also

Kids robot.svg In Spanish: Condado de Columbia (Washington) para niños

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