Winnebago County, Illinois

Founding: 1836
Parent counties: Jo Daviess and unorganized territory

Namesake: The Winnebago people
Seat: Rockford (1836–)

Land area: 513 square miles

Population (2020): 285,350

Population (historic): 4,609 (1840); 24,491 (1860); 30,505 (1880); 47,845 (1900); 117,373 (1930)

Periods of population growth: pre-1840–2010

Subdivisions: Three cities; eight villages; one CDP; 14 townships

Pre-1940 residences (estimated): 20,060 (16%)
Pre-1940 housing survival rate: 54.8%
Pre-1860 housing survival rate (1940): 14.2%

Farm housing in disrepair (1950): 4.3%

Nonfarm housing in disrepair (1950): 4.9%

Average farmhouse value (1930): $2,846
Average outbuilding value (1930): $3,058

Average farmhouse size (1940): 7.2 rooms
Number of farms (1920): 2,185
Average farm size (1920): 113.5 acres
Sources of settlement: New York, Sweden, Ireland, England, Pennsylvania, Wisconsin, and Scotland
_________________________________________________________________________________

Rockford

Namesake: The Rock River

Founding: 1834 (platting as Midway); 1837 (post office); 1839 (incorporation)

Population (2020): 148,655

Population (historic): 6,979 (1860); 13,120 (1880); 31,051 (1900); 85,864 (1930)

Periods of population growth: 1834–1930; 1940–1970; 1990–2010
Pre-1940 residences (estimated): 16,252 (23.7%)
_________________________________________________________________________________

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

Outstanding Buildings

1. James Bickford Farm (c. 1860). 3796 Harrison Road. Burritt. Italianate.
2. House (c. 1855). 809 Elgin Street. Cherry Valley. Greek Revival.
3. Willow Creek Presbyterian Church (1877). 7300 Belvidere Road. Harlem. Gothic Revival.
4. William Halley Farm (c. 1865). 4826 Favor Road. Owen. Gothic Revival.
5. Stephen Thompson Farm (c. 1860). 5190 Favor Road. Owen. Italianate.
6. David Sample Farm (c. 1875). 5265 Owen Center Road. Owen. Italianate.
7. Zeno Campbell Farm (c. 1870). 7781 Best Road. Pecatonica. Italianate.
8. Indian Hill Farm / Charles Barrett Estate (1916–1918). 6901 Kishwaukee Road. Rockford. Craftsman.
9. William Campbell Farm (c. 1890). 14474 Hansberry Road. Rockton. Queen Anne.
10. William Phelps Farm (c. 1875). 5165 West Rockton Road. Rockton. Italianate.
11. John Rhodes Farm (c. 1855). 6019 Belvidere Road. Roscoe. Greek Revival.
12. David Weld Farm (c. 1855). 16139 Comly Road. Seward.
13. Edmond Whittlesey House (c. 1850). 16621 Comly Road. Seward. Greek Revival.
14. Samuel Stilwell House (c. 1850). 9265 Yale Bridge Road. Shirland. Greek Revival.
15. Benjamin Anderson House (c. 1860). 9463 Edwardsville Road. Winnebago. Italianate.
16. Elijah Holt Farm (c. 1860). 8274 Montague Road. Winnebago. Italianate.
17. John Weldon Farm (c. 1890). 3332 South Weldon Road. Winnebago. Queen Anne.
18. Adoniram Mellen House (c. 1870). 2027 South Winnebago Road. Winnebago. Italianate/Gothic Revival.

_________________________________________________________________________________