Linn County, Iowa

Founding: 1839 (declared in 1837)
Parent county: Dubuque

Namesake: Lewis Linn, Missouri politician
Seat: Marion (1839–1919); Cedar Rapids (1919–)

Land area: 717 square miles

Population (2020): 230,299

Population (historic): 5,444 (1850); 31,080 (1870); 45,303 (1890); 60,720 (1910); 82,336 (1930)

Periods of population growth: 1840–1980; 1990–2020

Subdivisions: 18 cities; 19 townships

National Register listings: 128

Pre-1940 residences (estimated): 14,182 (14.6%)
Pre-1940 housing survival rate: 61.5%
Pre-1860 housing survival rate (1940): 10.5%

Farm housing in disrepair (1950): 6.8%

Nonfarm housing in disrepair (1950): 4.7%

Average farmhouse value (1930): $2,436
Average outbuilding value (1930): $2,502
Average farmhouse size (1940): 6.6 rooms
Number of farms (1920): 3,666
Average farm size (1920): 91.4 acres
Sources of settlement: Ohio, Pennsylvania, New York, Czechoslovakia, Illinois, Indiana, Ireland, and Germany

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Marion (ex-seat)

Namesake: Francis Marion, Continental Army officer

Founding: 1839 (platting); 1840 (post office); 1865 (incorporation)

Population (2020): 41,535

Population (historic): 1,367 (1860); 1,939 (1880); 4,102 (1900); 4,348 (1930)

Periods of population growth: 1839–1910; 1920–2020
Pre-1940 residences (estimated): 985 (5.8%)

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Cedar Rapids

Namesake: Rapids along the Cedar River

Founding: 1841 (platting as Rapids City); 1846 (post office); 1849 (incorporation)

Population (2020): 137,710

Population (historic): 1,830 (1860); 10,104 (1880); 25,656 (1900); 56,097 (1930)

Periods of population growth: 1841–1970; 1990–2020
Pre-1940 residences (estimated): 9,986 (16%)
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Outstanding Buildings