Modoc County, California

Founding: 1874
Parent county: Siskiyou

Namesake: The Modoc tribe
Seat: Alturas (1874–)

Land area: 3,918 square miles

Population (2020): 8,700

Population (historic): 4,399 (1880); 5,076 (1900); 8,038 (1930)

Periods of population growth: pre-1880–1910; 1920–1950; 1970–1990; 2000s

Subdivisions: One city; 12 CDPs

National Register listings: 18

Pre-1940 residences (estimated): 1,039 (19.7%)
Pre-1940 housing survival rate: 31.1%

Farm housing in disrepair (1950): 12.8%

Nonfarm housing in disrepair (1950): 8.6%

Average farmhouse value (1930): $1,696
Average outbuilding value (1930): $1,388
Average farmhouse size (1940): 5.1 rooms
Number of farms (1920): 743
Average farm size (1920): 226.4 acres
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Alturas

Namesake: The Spanish word alturas ("the heights")

Founding: pre-1871 (founding as Dorris Bridge); 1871 (post office); 1901 (incorporation)

Population (2020): 2,715

Population (historic): 148 (1880); 916 (1910); 979 (1920); 2,338 (1930)

Periods of population growth: pre-1880–1900; 1920s; 1940s
Pre-1940 residences (estimated): 351 (24.6%)
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Outstanding Buildings

1. Farm (c. 1895). 43029 County Road 1. Queen Anne.