St. Clair County, Missouri Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
St. Clair County, MO Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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C
Health Below averageLess healthy than 71% of counties in Missouri
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D
Income Well below averageLess wealthy than 75% of counties in Missouri
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F
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | St. Clair County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Population | 9,587 | 6,186,340 | 337,468,954 |
| Population density (per sq mi) | 13.7 | 88.8 | 86.4 |
| Population growth (%/yr) | 0.19% | 0.28% | 0.59% |
| Median age | 48.0 | 37.5 | 37.3 |
| Households | 4,071 | 2,507,647 | 130,235,071 |
Population in St. Clair County grew by 2.2% from 2009 to 2024, reaching 9,587 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in St. Clair County is Boomers, aged 61–79, at 24.5% of residents. That is 6.6 points above Missouri as a whole.
- Gen Z 13–28 1,585 16.5% -4.7 pts
- Millennials 29–44 1,545 16.1% -5.2 pts
- Gen X 45–60 2,142 22.3% +2.7 pts
- Boomers 61–79 2,348 24.5% +6.6 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Missouri, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 49.4% of the people living in St. Clair County and men 50.6%.
- Women 49.4% Missouri 50.7%
- Men 50.6% Missouri 49.3%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in St. Clair County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
St. Clair County has a the economy index of D, which means it is barely prosperous.
| Metric | St. Clair County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Median household income | $52,864 | $70,801 | $80,455 |
| Income growth (%/yr) | 5.87% | 4.56% | 4.80% |
| Unemployment rate | 3.3% | 4.0% | 5.2% |
The median household income in St. Clair County is about 25% lower than in Missouri.
Housing
| Metric | St. Clair County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Median home price | $138,043 | $145,462 | $248,835 |
| Median rent | $621 | $1,033 | $1,407 |
| Homeownership rate | 76.0% | 68.1% | 65.2% |
The median home price in St. Clair County is about 18.5 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $621 per month for that long.
Commute Time & Mobility
Commuters in St. Clair County spend about 44 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 183 hours, about 7.6 full days, spent commuting.
| Metric | St. Clair County | Missouri Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 22.0 | 21.0 | 22.4 |
| Round-trip commute (min) | 44.0 | 41.9 | 44.8 |
| Yearly time spent (hours) | 183 | 175 | 187 |
| Estimated yearly cost | $5,683 | $5,415 | $5,790 |
| Work from home | 8.8% | 13.0% | 15.0% |
| Highway traffic (vehicles/day) | 2,981 | 7,545 | 8,813 |
| Local road traffic (vehicles/day) | 516 | 923 | 1,355 |
Fastest commutes among counties in
Missouri:
Saline County (11.9 min), Adair County (12.0 min), Nodaway County (12.1 min).
Slowest:
Bollinger County (33.1 min), Ray County (32.2 min), Maries County (31.9 min).
The average commute time in St. Clair County is 22 minutes, longer than the 21 minutes in Missouri.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
St. Clair County has a education index of F, which means it scores poorly in education.
| Metric | St. Clair County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 12.0% | 28.8% | 31.6% |
| Average household size | 2.31 | 2.40 | 2.53 |
Highest education index among counties in
Missouri:
St. Louis County (0.4), Platte County (0.4), Boone County (0.4).
Lowest:
Bollinger County (0.2), Wayne County (0.2), Ripley County (0.2).
Health
St. Clair County has a health index of C, which means it is somewhat healthy.
| Metric | St. Clair County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 77.9 | 76.9 | 78.3 |
| Self-rated poor health | 21.8% | 19.0% | 16.3% |
| Smokers | 23.7% | 22.8% | 19.0% |
Highest health index among counties in
Missouri:
St. Charles County (0.8), Platte County (0.8), Boone County (0.8).
Lowest:
Scotland County (0.7), Ripley County (0.7), Pemiscot County (0.8).
St. Clair County, MO Compared With Nearby Counties
St. Clair County, MO is the smallest of the 4 counties compared here, 9,587 residents against a local median of 22,328. St. Clair County, MO sits close to the middle of its own neighbourhood. No measure below is more than 15% off the local median, so the choice between these counties turns on things this data does not capture.
The largest of those small differences is median home price, 15% below the local median at $138,043 against $162,215. St. Clair County, MO has the 3rd highest median home price of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| St. Clair County, MO | 9,587 | $52,864 #3/4 | $138,043 #3/4 | 22.0 min #2/4 |
| Henry County, MO | 22,328 | $57,861 | $162,215 | 15.3 min |
| Benton County, MO | 20,151 | $52,808 | $80,000 | 23.9 min |
| Polk County, MO | 32,444 | $59,586 | $512,500 | 23.5 min |
Frequently Asked Questions
Common questions about St. Clair County, Missouri.
How many people live in St. Clair County, Missouri?
About 9,587 people live in St. Clair County, Missouri, in 4,071 households of 2.3 people on average. The median age is 48.0, so residents are older than the U.S. median of 37.3 by about 11 years.
How densely populated is St. Clair County, Missouri?
Averaged over its land area, St. Clair County, Missouri has 14 people per square mile, a density typical of rural areas. That is about 16% of the U.S. average of 86.
Can a typical household afford a home in St. Clair County, Missouri?
The median home costs 2.6 times the median household income ($138,043 against $52,864), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $621 a month takes about 14% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How strong is the job market in St. Clair County, Missouri?
Unemployment in St. Clair County, Missouri is only 3.3%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
How common is a college degree in St. Clair County, Missouri?
12.0% of adults in St. Clair County, Missouri hold a bachelor's degree or higher (about 1 in 8), well below the U.S. share of 31.6%.
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