Sangamon County, Illinois

Founding: 1821
Parent counties: Bond and Madison

Namesake: The Sangamon River
Seat: Springfield (1821–)

Land area: 868 square miles

Population (2020): 196,343

Population (historic): 12,960 (1830); 19,228 (1850); 46,352 (1870); 71,593 (1900); 111,733 (1930)

Periods of population growth: pre-1830–2010

Subdivisions: Four cities; 23 villages; 26 townships

National Register listings: 65

Pre-1940 residences (estimated): 15,027 (16.3%)
Pre-1940 housing survival rate: 44.9%
Pre-1860 housing survival rate (1940): 10.6%

Farm housing in disrepair (1950): 5.6%

Nonfarm housing in disrepair (1950): 5.4%

Average farmhouse value (1930): $2,048
Average outbuilding value (1930): $1,671

Average farmhouse size (1940): 5.8 rooms
Number of farms (1920): 3,425
Average farm size (1920): 134.7 acres
Sources of settlement: Kentucky, Ohio, Ireland, Germany, New York, Virginia, and Pennsylvania
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Springfield

Namesake: A traditional name

Founding: 1821 (platting); 1828 (post office); 1840 (incorporation)

Population (2020): 114,394

Population (historic): 2,579 (1840); 9,320 (1860); 19,743 (1880); 34,159 (1900); 71,864 (1930)

Periods of population growth: pre-1840–2010
Pre-1940 residences (estimated): 9,958 (18.2%)
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Outstanding Buildings

1. Charles Boynton House (c. 1855), North Pleasant Plains Road, south of Prairie Creek Road. Cartwright. Greek Revival. Razed.
2. Wilson House (c. 1865). 12043 Salisbury Road. Cartwright. Gothic Revival.
3. *John Broadwell Inn (1824). 12828 State Route 125. Cartwright.
4. Jesse Oder House (c. 1850). 931 South Wake Road. Cartwright. Greek Revival.
5. *Joseph Miller Farm (1867). 3003 Parks Lane. Cooper. Italianate.
6. *Joseph Ross House (1868). 5200 Passfield Road. Cooper. Italianate.
7. *Benjamin Caldwell Farm (1876). 6711 South Veteran's Parkway. Curran. Italianate.
8. *George Power Farm (c. 1845). 485 West Barber Road. Fancy Creek.
9. *Cornelius Flagg Farm (1871–1872). 500 Old Tipton School Road. Fancy Creek. Italianate.
10. John Gardner Farm (c. 1850). 7369 State Route 125. Gardner. Greek Revival.
11. James Smith House (c. 1865). 16550 Old Jacksonville Road. Island Grove. Italianate.
12. Arthur Pickrell House (c. 1895). 63 Roby Road. Mechanicsburg. Queen Anne.
13. Horning House (c. 1870). 2993 Leach Road. Rochester. Italianate.
14. *Charles Broadwell House (c. 1835). 2851 Green Valley Road. Springfield. Greek Revival.
15. Nathan Hussey House (c. 1875). 5465 Wolf Creek Road. Williams. Italianate.
16. *Thomas Strawbridge Farm (c. 1845). 5255 Shepherd Road. Woodside. Greek Revival.