Population 9,587 · Census ACS 2020–24
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Population and households in St. Clair County
Household size in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 2.25 | 2.49 | 2.68 |
| 2010–14 | 2.31 | 2.52 | 2.73 |
| 2015–19 | 2.20 | 2.50 | 2.71 |
| 2020–24 | 2.35 | 2.49 | 2.65 |
| Change | +0.10 | −0.00 | −0.03 |
St. Clair County is a place of small households, averaging 2.35 people against 2.65 for the U.S., which points to many singles, couples and roommates and relatively few children. Household size has climbed from 2.25 in 2006–10, even as the national average fell. Only ten of Missouri's 115 counties have smaller households.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 47.1 | 38.4 | 37.7 |
| 2010–14 | 48.4 | 39.2 | 38.6 |
| 2015–19 | 50.5 | 40.0 | 39.6 |
| 2020–24 | 44.2 | 40.1 | 40.1 |
| Change | −2.9 | +1.7 | +2.3 |
St. Clair County skews older: half of its residents are older than 44.2, well above the national median of 40.1. That usually means more empty nesters and retirees, and fewer young families. The median age has dropped from 47.1 in 2006–10, even as the national median rose.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 8.4% | 11.3% | 12.3% |
| 2010–14 | 7.2% | 11.4% | 12.3% |
| 2015–19 | 8.0% | 10.9% | 11.6% |
| 2020–24 | 9.0% | 11.0% | 11.6% |
| Change | +0.6 pts | −0.3 pts | −0.6 pts |
Single-parent households are less common in St. Clair County than nationally: 9.0%, against 11.6%. Since 2006–10, the single-parent share has edged up 0.6 points, even as the national share fell.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in St. Clair County
Renters in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 19.1% | 30.0% | 33.3% |
| 2010–14 | 22.4% | 32.1% | 35.6% |
| 2015–19 | 21.7% | 33.2% | 36.0% |
| 2020–24 | 24.0% | 31.9% | 34.8% |
| Change | +4.9 pts | +1.9 pts | +1.5 pts |
Only 24.0% of households in St. Clair County rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 53.2% have no mortgage at all, well above the national share of 39.8%. Rentals cluster in the northwest; owners are most common in the south. Since 2006–10, the renter share has risen 4.9 points, a much bigger shift than nationally.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 22.9% | 11.6% | 11.4% |
| 2010–14 | 26.6% | 12.0% | 11.4% |
| 2015–19 | 26.0% | 12.2% | 11.1% |
| 2020–24 | 22.5% | 10.5% | 9.6% |
| Change | −0.4 pts | −1.1 pts | −1.8 pts |
Vacant homes make up 22.5% of the housing in St. Clair County, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand. St. Clair County has a higher vacancy rate than the great majority of Missouri counties.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 1971 | 1974 | 1974 |
| 2010–14 | 1977 | 1975 | 1975 |
| 2015–19 | 1976 | 1976 | 1977 |
| 2020–24 | 1981 | 1978 | 1980 |
| Change | +10 | +4 | +6 |
The typical home in St. Clair County was built around 1981, about the same vintage as the country's housing overall (1980). The median year built has moved up from 1971 in 2006–10, a sign of steady new building. Newer construction is concentrated in the northeast, while the center has the oldest housing.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | $437 | $740 | $965 |
| 2010–14 | $505 | $816 | $1,040 |
| 2015–19 | $595 | $899 | $1,213 |
| 2020–24 | $707 | $1,122 | $1,571 |
| Change | +$270 | +$383 | +$606 |
The median renter in St. Clair County pays $707 a month for rent and utilities, well below the national median of $1,571. Rent has climbed $270 a month since 2006–10, up 62%, roughly in step with the nation. The typical renter here spends 27.7% of household income on rent, just under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally. Renters on a budget will find the lowest rents in the northwest; the highest are in the east.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in St. Clair County
Bachelor's degrees in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 14.5% | 26.0% | 28.4% |
| 2010–14 | 11.7% | 27.3% | 29.6% |
| 2015–19 | 13.9% | 29.6% | 32.1% |
| 2020–24 | 14.4% | 32.6% | 35.6% |
| Change | −0.1 pts | +6.6 pts | +7.2 pts |
Fewer adults in St. Clair County have a four-year degree than in the country as a whole: 14.4%, against 35.6% nationally. College graduates are most concentrated in the center and least in the northeast. St. Clair County has a lower share of college graduates than at least four in five Missouri counties.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 83.3% | 86.8% | 84.9% |
| 2010–14 | 81.7% | 88.3% | 86.1% |
| 2015–19 | 84.6% | 90.0% | 87.7% |
| 2020–24 | 85.8% | 91.8% | 89.3% |
| Change | +2.5 pts | +5.1 pts | +4.3 pts |
About one in seven adults in St. Clair County never finished high school, more than nationally: 85.8% have a diploma or equivalent, against 89.3% across the U.S. The share with a diploma is up 2.5 points from 2006–10, as it has nationally.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in St. Clair County
| Period | St. Clair County | Missouri | U.S. |
|---|---|---|---|
| 2006–10 | 5.5% | 7.4% | 8.1% |
| 2010–14 | 10.9% | 8.4% | 9.4% |
| 2015–19 | 3.9% | 4.6% | 5.6% |
| 2020–24 | 3.2% | 4.1% | 5.4% |
| Change | −2.3 pts | −3.3 pts | −2.7 pts |
Unemployment in St. Clair County has been low: just 3.2% of the labor force was out of work and looking, well below the national rate of 5.4%. Since 2006–10, unemployment has fallen 2.3 points, as it has nationally. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
St. Clair County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| St. Clair County | 2.35 | 44.2 | 9.0% | 24.0% | 22.5% | 1981 | $707 | 14.4% | 85.8% | 3.2% |
| Hickory County | 2.41 | 53.8 | 5.1% | 17.6% | 32.9% | 1985 | $657 | 13.1% | 87.3% | 12.9% |
| Camden County | 2.49 | 51.0 | 6.4% | 17.5% | 48.4% | 1988 | $1,012 | 26.3% | 92.7% | 4.3% |
| Maries County | 2.54 | 42.8 | 6.6% | 21.7% | 17.4% | 1985 | $595 | 15.0% | 88.3% | 4.6% |
| Phelps County | 2.50 | 37.6 | 12.3% | 38.3% | 14.9% | 1986 | $845 | 32.4% | 89.8% | 4.1% |
| Crawford County | 2.34 | 42.6 | 11.1% | 30.8% | 14.1% | 1983 | $826 | 14.8% | 86.6% | 5.2% |
| Washington County | 2.60 | 40.8 | 11.3% | 21.6% | 16.1% | 1985 | $741 | 11.1% | 85.7% | 5.3% |
| Ste. Genevieve County | 2.57 | 43.3 | 10.9% | 17.0% | 14.4% | 1979 | $767 | 16.9% | 93.7% | 4.3% |
| Harvey County | 2.42 | 41.1 | 9.3% | 30.2% | 8.3% | 1970 | $936 | 30.5% | 92.7% | 4.6% |
| Randolph County | 2.32 | 43.6 | 11.7% | 23.4% | 11.8% | 1972 | $823 | 16.6% | 89.0% | 4.9% |
| Reno County | 2.32 | 41.9 | 12.1% | 30.8% | 10.9% | 1963 | $931 | 20.7% | 90.7% | 3.8% |
All figures 2020–24.
Counties with similar populations: Crockett County, TN · Custer County, MT · Custer County, ID · Custer County, CO · Cumberland County, VA · Cumberland County, KY · Cumberland County, IL · Culebra Municipio, PR · Culberson County, TX · Crowley County, CO
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up St. Clair County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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