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

National Register listings: 27

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 larger 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.