Delaware County, Iowa

Founding: 1844 (declared in 1837)
Parent county: Dubuque

Namesake: The Delaware people
Seat: Delhi (1842–1880); Manchester (1880–)

Land area: 578 square miles

Population (2020): 17,488

Population (historic): 1,759 (1850); 17,432 (1870); 17,349 (1890); 17,888 (1910); 18,122 (1930)

Periods of population growth: pre-1850–1880; 1890s; 1910s; 1930s; 1950–1980; 1990s

Subdivisions: 12 cities; 16 townships

Pre-1940 residences (estimated): 2,545 (31.4%)
Pre-1940 housing survival rate: 54.7%
Pre-1860 housing survival rate (1940): 6.7%

Farm housing in disrepair (1950): 5.8%

Nonfarm housing in disrepair (1950): 9.6%

Average farmhouse value (1930): $2,372
Average outbuilding value (1930): $3,515
Average farmhouse size (1940): 7 rooms
Number of farms (1920): 2,284
Average farm size (1920): 122 acres
Sources of settlement: New York, Germany, Pennsylvania, Ohio, Ireland, Illinois, and England
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Manchester

Namesake: Uncertain—perhaps Manchester, England

Founding: 1854 (platting as Burrington); 1856 (post office); 1858 (replatting); 1865 (incorporation)

Population (2020): 5,179

Population (historic): 1,492 (1870); 2,344 (1890); 2,758 (1910); 3,413 (1930)

Periods of population growth: 1854–1900; 1910–2000
Pre-1940 residences (estimated): 768 (32.9%)
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