Putnam County, Illinois

Founding: 1831 (declared in 1825)
Parent county: Unorganized territory

Namesake: Israel Putnam, Continental Army officer
Seat: Hennepin (1831–)

Land area: 160 square miles

Population (2020): 5,637

Population (historic): 2,131 (1840); 5,587 (1860); 5,554 (1880); 4,746 (1900); 5,235 (1930)

Periods of population growth: pre-1840–1870; 1890–1920; 1930s; 1960–1980; 1990s

Subdivisions: Six villages; four townships

Pre-1940 residences (estimated): 821 (26.3%)
Pre-1940 housing survival rate: 52.5%
Pre-1860 housing survival rate (1940): 17.4%

Farm housing in disrepair (1950): 3.6%

Nonfarm housing in disrepair (1950): 8%

Average farmhouse value (1930): $2,294
Average outbuilding value (1930): $2,739

Average farmhouse size (1940): 6.9 rooms
Number of farms (1920): 533
Average farm size (1920): 126.9 acres
Sources of settlement: Ohio, Pennsylvania, Germany, and New York
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Hennepin

Namesake: Louis Hennepin, Belgian priest and explorer

Founding: 1831 (platting); 1831 (post office); 1837 (incorporation)

Population (2020): 769

Population (historic): 623 (1880); 523 (1900); 312 (1930)

Periods of population growth: pre-1880; 1930s; 1950–1980; 1990–2020
Pre-1940 residences (estimated): 94 (22.4%)
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Outstanding Buildings

1. Farm (c. 1860). 12703 State Route 71. Granville. Italianate.
2. Edward Pulsifer House (1844). 7222 Power Plant Road. Hennepin. Greek Revival.
3. Henry Mills Farm (c. 1890). 2054 Road 1475 East. Magnolia. Queen Anne.
4. William Hoyle Farm (c. 1850). 4026 Swaney Road. Magnolia. Greek Revival.
5. Cortland Condit House (1849–1850). 404 High Street. Senachwine. Greek Revival.

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