San Francisco County, California

Founding: 1850
Parent counties: Unorganized territory

Namesake: The city of San Francisco
Seat: San Francisco (1850–)

Land area: 232 square miles

Population (2020): 873,965

Population (historic): 56,802 (1860); 233,959 (1880); 342,782 (1900); 634,394 (1930)

Periods of population growth: pre-1860–1950; 1980–2020

National Register listings: 206

Pre-1940 residences (estimated): 190,987 (47.6%)
Pre-1940 housing survival rate: 77.8%
Pre-1860 housing survival rate (1940): 2.3%

Housing in disrepair (1950): 2.4%

Average farmhouse value (1930): $1,531
Average outbuilding value (1930): $1,723
Number of farms (1920): 74
Average farm size (1920): 11.4 acres
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San Francisco

Namesake: St. Francis of Assisi

Founding: 1776 (founding); 1835 (platting); 1849 (post office); 1850 (incorporation)
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