Marin County, California

Founding: 1850
Parent county: Unorganized territory

Namesake: Unknown
Seat: San Rafael (1850–)

Land area: 520 square miles

Population (2020): 262,321

Population (historic): 3,334 (1860); 11,324 (1880); 15,702 (1900); 41,648 (1930)

Periods of population growth: pre-1860–2020

Subdivisions: 11 cities; 21 CDPs

Pre-1940 residences (estimated): 14,897 (13.2%)
Pre-1940 housing survival rate: 83.1%
Pre-1860 housing survival rate (1940): 1.9%

Farm housing in disrepair (1950): 5.5%

Nonfarm housing in disrepair (1950): 4.8%

Average farmhouse value (1930): $1,836
Average outbuilding value (1930): $2,824
Average farmhouse size (1940): 5.3 rooms
Number of farms (1920): 718
Average farm size (1920): 122.3 acres
Sources of settlement: New York, China, Ireland, Switzerland, Portugal, Germany, and New England states
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San Rafael

Namesake: The Mission San Rafael Arcángel

Founding: 1817 (mission's founding); 1851 (post office); 1874 (incorporation)

Population (2020): 61,271

Population (historic): 841 (1870); 3,290 (1890); 5,934 (1910); 8,022 (1930)

Periods of population growth: pre-1870–1910; 1920–2020
Pre-1940 residences (estimated): 2,406 (10.1%)
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