Tompkins County, New York

Founding: 1817
Parent counties: Cayuga and Seneca

Namesake: Daniel Tompkins, New York governor
Seat: Ithaca (1817–)

Land area: 475 square miles

Population (2020): 105,740

Population (historic): 20,681 (1820); 38,746 (1850); 33,178 (1870); 33,830 (1900); 41,490 (1930)

Periods of population growth: pre-1820–1850; 1860–1880; 1890s; 1910–2020

Subdivisions: One city; six villages; 14 CDPs; nine towns

Pre-1940 residences (estimated): 10,911 (25.1%)
Pre-1940 housing survival rate: 85.9%
Pre-1860 housing survival rate (1940): 36.3%

Farm housing in disrepair (1950): 9.9%

Nonfarm housing in disrepair (1950): 5.9%

Average farmhouse value (1930): $1,761
Average outbuilding value (1930): $1,603
Average farmhouse size (1940): 7.8 rooms
Number of farms (1920): 2,550
Average farm size (1920): 73.3 acres
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Ithaca

Namesake: Ithaca, Greece

Founding: 1791 (platting); 1804 (post office); 1821 (incorporation)

Population (2020): 32,108

Population (historic): 8,462 (1870); 11,079 (1890); 14,802 (1910); 20,708 (1930)

Periods of population growth: pre-1870–1930; 1940s; 1970–1990; 2000–2020
Pre-1940 residences (estimated): 4,637 (38.6%)
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