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St. Clair County, Michigan facts for kids

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St. Clair County
Fort Gratiot Light
Official seal of St. Clair County
Seal
Map of Michigan highlighting St. Clair County
Location within the U.S. state of Michigan
Map of the United States highlighting Michigan
Michigan's location within the U.S.
Country  United States
State  Michigan
Founded March 28, 1820 (created)
1821 (organized)
Named for St. Clare of Assisi
Seat Port Huron
Largest city Port Huron
Area
 • Total 837 sq mi (2,170 km2)
 • Land 721 sq mi (1,870 km2)
 • Water 115 sq mi (300 km2)  14%%
Population
 (2020)
 • Total 160,383
 • Density 226/sq mi (87/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Area code 810
Congressional district 10th

St. Clair County is a county located in the U.S. state of Michigan and bordering the west bank of the St. Clair River. As of the 2020 Census, the population was 160,383. It is the 13th-most populous county in the state. The county seat is Port Huron, located at the north end of the St. Clair River at Lake Huron. The county was created September 10, 1820, and its government was organized in 1821. Located northeast of Detroit, St. Clair County is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. Geographically, it lies in the Thumb area of eastern Michigan.

Demographics

Historical population
Census Pop.
1830 1,114
1840 4,606 313.5%
1850 10,420 126.2%
1860 26,604 155.3%
1870 36,661 37.8%
1880 46,197 26.0%
1890 52,105 12.8%
1900 55,228 6.0%
1910 52,341 −5.2%
1920 58,009 10.8%
1930 67,563 16.5%
1940 76,222 12.8%
1950 91,599 20.2%
1960 107,201 17.0%
1970 120,175 12.1%
1980 138,802 15.5%
1990 145,607 4.9%
2000 164,235 12.8%
2010 163,040 −0.7%
2020 160,383 −1.6%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2019

The 2010 United States Census indicates St. Clair County had a 2010 population of 163,040. This is a decrease of -1,195 people from the 2000 United States Census. Overall, the county had a -0.7% growth rate during this ten-year period. In 2010 there were 63,841 households and 44,238 families in the county. The population density was 226.1 per square mile (87.3 square kilometers). There were 71,822 housing units at an average density of 99.6 per square mile (38.5 square kilometers). 93.9% were White, 2.4% Black or African American, 0.5% Asian, 0.4% Native American, 0.7% of some other race and 2.0% of two or more races. 2.9% were Hispanic or Latino (of any race). 25.9% identified as of German, 10.2% Polish, 9.3% Irish, 8.5% English, 6.5% French, 6.5% American, and 5.1% Italian ancestry.

There were 63,841 households, out of which 31.3% had children under the age of 18 living with them, 52.9% were opposite-sex families, 11.4% had a female householder with no husband present, 30.7% were non-families, and 25.5% were made up of individuals. The average household size was 2.52 and the average family size was 3.01.

In the county, the population was spread out, with 23.7% under age of 18, 8.0% from 18 to 24, 23.8% from 25 to 44, 30.1% from 45 to 64, and 14.5% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 98.1 males. For every 100 females age 18 and over, there were 95.7 males.

The 2010 American Community Survey 1-year estimate indicates the median income for a household in the county was $44,369 and the median income for a family was $53,207. Males had a median income of $30,056 versus $16,771 for females. The per capita income for the county was $22,390. About 10.4% of families and 15.4% of the population were below the poverty line, including 22.7% of those under the age 18 and 6.8% of those age 65 or over.

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