St. Clair County, Michigan

Founding: 1821 (declared in 1820)
Parent county: Macomb

Namesake: The St. Clair River
Seat: St. Clair (1821–1871); Port Huron (1871–)

Land area: 721 square miles

Population (2020): 160,383

Population (historic): 1,114 (1830); 26,604 (1860); 46,197 (1880); 55,228 (1900); 67,563 (1930)

Periods of population growth: pre-1830–1900; 1910–2000

Subdivisions: Eight cities; two villages; one CDP; 23 townships

National Register listings: 26

Pre-1940 residences (estimated): 12,452 (17.2%)
Pre-1940 housing survival rate: 54.7%
Pre-1860 housing survival rate (1940): 9.4%

Farm housing in disrepair (1950): 7.5%

Nonfarm housing in disrepair (1950): 5.2%
Average farmhouse value (1930): $1,621
Average outbuilding value (1930): $1,454
Average farmhouse size (1940): 6.7 rooms
Number of farms (1920): 4,159
Average farm size (1920): 74.9 acres
Sources of settlement: Canada, Germany, New York, Ireland, and England
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Port Huron

Namesake: Lake Huron

Founding: 1837 (platting); 1837 (post office); 1857 (incorporation)

Population (2020): 28,983

Population (historic): 4,371 (1860); 8,883 (1880); 19,158 (1900); 31,361 (1930)

Periods of population growth: pre-1860–1900; 1910–1960
Pre-1940 residences (estimated): 4,331 (31.6%)
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Outstanding Buildings

1. Miles Christie Farm (c. 1880). 1666 Capac Road. Berlin. Gothic Revival.
2. St. Paul's Lutheran Church (1913). 5322 Palms Road. Casco. Gothic Revival.
3. Schriner House (c. 1870). 5030 Belle River Road. China. Italianate.