Columbia County, Washington

Founding: 1875
Parent county: Walla Walla

Namesake: The Columbia River
Seat: Dayton (1875–)

Land area: 869 square miles

Population (2020): 3,952

Population (historic): 7,103 (1880); 7,128 (1900); 5,325 (1930)

Periods of population growth: pre-1880; 1890s; 1930s

Subdivisions: One city; one town

National Register listings: 20

Pre-1940 residences (estimated): 866 (40.1%)
Pre-1940 housing survival rate: 46.3%

Farm housing in disrepair (1950): 5.8%

Nonfarm housing in disrepair (1950): 5.4%

Average farmhouse value (1930): $1,537
Average outbuilding value (1930): $1,449
Average farmhouse size (1940): 5.9 rooms
Number of farms (1920): 622
Average farm size (1920): 309.7 acres
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Dayton

Namesake: Jesse Day, owner of the city site

Founding: 1871 (platting); 1872 (post office); 1876 (incorporation)

Population (2020): 2,448

Population (historic): 996 (1880); 2,216 (1900); 2,528 (1930)

Periods of population growth: 1871–1920; 1930s; 1990s
Pre-1940 residences (estimated): 597 (44.4%)
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Outstanding Buildings

1. Joseph Rose Farm (c. 1895). 104 Harting Grade Road. Queen Anne.
2. *Jacob Weinhard House (1907). 120 Weinhard Road. Classical Revival.