Hardin County, Illinois

Founding: 1839
Parent county: Pope

Namesake: John Hardin, Continental Army officer
Seat: Elizabethtown (1839–)

Land area: 178 square miles

Population (2020): 3,649

Population (historic): 1,378 (1840); 5,113 (1870); 7,448 (1900); 6,955 (1930)

Periods of population growth: pre-1840–1900; 1910s; 1930s; 1970s

Subdivisions: One city; two villages

National Register listings: Five

Pre-1940 residences (estimated): 491 (22.4%)
Pre-1940 housing survival rate: 25.1%
Pre-1860 housing survival rate (1940): 10.8%

Farm housing in disrepair (1950): 25.2%

Nonfarm housing in disrepair (1950): 22.6%
Average farmhouse value (1930): $543
Average outbuilding value (1930): $434

Average farmhouse size (1940): 3.7 rooms
Number of farms (1920): 861
Average farm size (1920): 81.5 acres
Sources of settlement: Kentucky, Tennessee, Indiana, and Germany
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Elizabethtown

Namesake: Elizabethtown, Kentucky

Founding: 1840 (post office); 1857 (incorporation)

Population (2020): 220

Population (historic): 484 (1880); 668 (1900); 488 (1930)

Periods of population growth: pre-1880–1900; 1910s; 1930s; 1970s
Pre-1940 residences (estimated): 49 (26.8%)
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Outstanding Buildings

1. *Daniel Frailey House (c. 1855). Bend of River Road, across from Ford's Ferry.
2. St. Joseph Catholic Church (1925). 15 St. Joseph Road. Romanesque.