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

National Register listings: Four

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.