Adams County, Illinois

Founding: 1825
Parent county: Pike

Namesake: John Quincy Adams, U.S. president
Seat: Quincy (1825–)

Land area: 855 square miles

Population (2020): 65,737

Population (historic): 2,186 (1830); 26,508 (1850); 56,362 (1870); 67,058 (1900); 62,784 (1930)

Periods of population growth: pre-1830–1900; 1920–1940; 1950–1980; 1990s

Subdivisions: One city; 13 villages; 23 townships

Pre-1940 residences (estimated): 8,080 (26.7%)
Pre-1940 housing survival rate: 50.2%
Pre-1860 housing survival rate (1940): 13.3%

Farm housing in disrepair (1950): 5.1%

Nonfarm housing in disrepair (1950): 6.2%

Average farmhouse value (1930): $1,719
Average outbuilding value (1930): $1,514

Average farmhouse size (1940): 6 rooms
Number of farms (1920): 3,844
Average farm size (1920): 97.1 acres
Sources of settlement: Germany, Ohio, Pennsylvania, Kentucky, Ireland, New York, Virginia, and Tennessee
_________________________________________________________________________________

Quincy

Namesake: John Quincy Adams, U.S. president

Founding: 1825 (platting); 1826 (post office); 1839 (incorporation)

Population (2020): 39,463

Population (historic): 2,319 (1840); 13,718 (1860); 27,268 (1880); 36,252 (1900); 39,241 (1930)

Periods of population growth: pre-1840–1910; 1920–1970; 1990–2010
Pre-1940 residences (estimated): 5,877 (30.6%)
_________________________________________________________________________________

View and filter the data. Or see a map.
_________________________________________________________________________________

Outstanding Buildings

1. Samuel Jamison House (c. 1870). 2702 North 24th Street. Ellington. Italianate.
2. Bernard Strothoff Farm (c. 1875). 9221 St. Ludgerus Road. Ellington. Italianate.
3. John Sterne House (1842). 4208 US Highway 24. Ellington. Greek Revival.
4. Robert Chase House (c. 1870). 5106 US Highway 24. Ellington. Italianate.
5. Lyman Seymour Farm (1907). 1288 North 390th Road. Fall Creek. Classical Revival.
6. John Reeder House (c. 1865). 3906 South 36th Street. Melrose. Italianate.
7. Andrew Hunsaker Farm (1864). 8205 State Road. Melrose.
8. Richard Wilson Farm (c. 1850). 1352 North 200th Road. Payson. Greek Revival. Razed.
9. Isaac Grove House (c. 1870). 222 East 1400th Road. Payson. Italianate. Razed.
10. Davis Colvin Farm (1863). 841 North 2000th Road. Ursa. Italianate.
11. William Ralph House (c. 1870). 1872 State Route 96. Ursa. Italianate/Gothic Revival.

_________________________________________________________________________________