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

National Register listings: 64

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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Outstanding Buildings

1. *Harrison Perry Farm (c. 1840). 1236 76 Road. Caroline. Greek Revival.
2. John Schutt House (c. 1840). 185 Midline Road. Caroline. Greek Revival.
3. *Aaron Bull House (c. 1840). 2490 Slaterville Road. Caroline. Greek Revival.
4. *Walter Thomas Farm (c. 1840). 2962 Slaterville Road. Caroline. Greek Revival.
5. *Albert Twogood Farm (c. 1840). 1975 Dryden Road. Dryden. Greek Revival.
6. *Stickle Hamblin House (c. 1840). 2085 Dryden Road. Dryden. Greek Revival.
7. *John Ellis Farm (c. 1855). 1790 Ellis Hollow Road. Dryden. Gothic Revival.
8. *School Number Five (1827). 1748 Hanshaw Road. Dryden. Federal.
9. *House (c. 1870). 12 Lake Road. Dryden. Italianate.
10. *House (c. 1885). 22 Purvis Road. Dryden. Stick.
11. *House (c. 1880). 474 Snyder Hill Road. Dryden. Second Empire.
12. *House (1879). 490 Snyder Hill Road. Dryden. Second Empire.
13. *Aaron Genung Farm (c. 1870). 505 Snyder Hill Road. Dryden. Italianate.
14. *House (c. 1875). 379 Virgil Road. Dryden. Italianate.
15. *Charles Woodward House (1822). 4 Stone House Road. Enfield. Federal.
16. *Henry Allen Farm (c. 1820). 973 Elm Street. Groton. Federal.
17. *Lyman Darling Farm (c. 1870). 210 Old Peruville Road. Groton. Second Empire.
18. *Joel Hough House (c. 1845). 612 Salt Road. Groton. Greek Revival/Italianate.
19. *Henry Walbridge House (c. 1840). 209 Coy Glen Road. Ithaca. Greek Revival.
20. *Cornelius Weller House (c. 1870). 929 Danby Road. Ithaca. Italianate.
21. *Thomas Williams House (1851–1852). 919 Elmira Road. Ithaca. Gothic Revival.
22. *Williams House (c. 1845). 704 Five Mile Road. Ithaca. Greek Revival/Italianate.
23. *Abraham Osmun House (c. 1860). 813 Auburn Road. Lansing. Italianate. Razed.
24. *Bower Farm (c. 1850). 989 Auburn Road. Lansing. Greek Revival.
25. *Rogues' Harbor Inn (1830/1842). 2079 East Shore Road. Lansing. Greek Revival.
26. *House (c. 1875). 304 Peruville Road. Lansing. Second Empire.
27. *Farm (c. 1880). 813 Ridge Road. Lansing. Eastlake.
28. *William Davis Farm (c. 1855). 1616 Ridge Road. Lansing. Gothic Revival.
29. *Ludlow House (c. 1890). 465 Van Ostrand Road. Lansing. Stick.
30. *Richard Hedden Farm (c. 1820). 154 Wilson Road. Lansing. Federal.
31. *Kellogg House (c. 1870). 190 Benjamin Hill Road. Newfield. Gothic Revival.
32. *Van Kirk House (c. 1870). 90 Van Kirk Road. Newfield. Italianate.
33. *Henry Rudy House (c. 1840). 6273 Curry Road. Ulysses. Greek Revival.
34. *House (c. 1880). 6402 Jacksonville Road. Ulysses. Italianate. Razed.
35. *Alfred Bates Farm (c. 1845). 8241 Searsburg Road. Ulysses. Greek Revival.
36. *Davis House (c. 1860). 1662 Taughannock Road. Ulysses. Gothic Revival.
37. *James Mattison House (c. 1865). 1822 Trumansburg Road. Ulysses. Italianate.
38. *Nicoll Halsey House (1829). 2057 Trumansburg Road. Ulysses. Greek Revival.