Monroe County, Illinois

Founding: 1816
Parent counties: Randolph and St. Clair

Namesake: James Monroe, U.S. president
Seat: Harrisonville (1816–1825); Waterloo (1825–)

Land area: 385 square miles

Population (2020): 34,962

Population (historic): 1,537 (1820); 7,679 (1850); 12,982 (1870); 13,847 (1900); 12,369 (1930)

Periods of population growth: pre-1820–1880; 1890s; 1930–2020

Subdivisions: Two cities; four villages

Pre-1940 residences (estimated): 1,770 (12.6%)
Pre-1940 housing survival rate: 55.6%
Pre-1860 housing survival rate (1940): 12.5%

Farm housing in disrepair (1950): 7.2%

Nonfarm housing in disrepair (1950): 5.4%

Average farmhouse value (1930): $1,291
Average outbuilding value (1930): $1,242

Average farmhouse size (1940): 5.2 rooms
Number of farms (1920): 1,498
Average farm size (1920): 109.5 acres
Sources of settlement: Germany and Missouri

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Waterloo

Namesake: The Battle of Waterloo

Founding: 1818 (platting); 1818 (post office); 1849 (incorporation)

Population (2020): 11,013

Population (historic): 791 (1850); 1,537 (1870); 1,860 (1890); 2,091 (1910); 2,239 (1930)

Periods of population growth: pre-1850–1900; 1920–2020
Pre-1940 residences (estimated): 450 (10.3%)

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Outstanding Buildings

1. Christian Henke Farm. 3373 Ahne Road.
2. Ryan Log House. 5430 Bluff Road. Dismantled and relocated.
3. Jacob Fults Farm. Bluff Road, southeast of Fults Road. Razed.
4. Joseph Platz Farm (c. 1850). 1276 Centerville Road.
5. Charles Schuler House (c. 1860). 9321 Coach Stop Road. Italianate.
6. Zoar Evangelical Church (c. 1860/1880). 9103 D Road. Romanesque.
7. William Harbaugh Farm (c. 1855). 5939 Deer Hill Road. Razed.
8. William Kraft Farm (c. 1850). Deer Hill Road, northwest of Ahne Road. Razed.
9. Hill Castle / Steffenauer–Gross–Hill Farm (1848/1876/1902/1926). 825 Hill Castle Road. Romanesque.
10. Immaculate Conception Catholic Church (1855). 2659 KK Road. Romanesque.
11. Immaculate Conception School (c. 1880). 2659 KK Road. Italianate.
12. Lorenz Hoffmann House (c. 1850). 4460 Kern Road.
13. Emil Kolmer Farm (c. 1860). 1404 North Market Street. Greek Revival.
14. Salem Evangelical Church Ruins (1883). 5779 Old Baum Church Road. Romanesque.
15. Henry Payne Log House. 460 Palmer Road. Razed.
16. Charles Spellmeier House (c. 1850). 2820 State Route 156.
17. Farm (c. 1860). 4105 State Route 156.
18. St. Marcus Evangelical Church (c. 1860). 4967 State Route 159.

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