St. Charles County, Missouri Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
St. Charles 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.
-
B
Health Around averageHealthiest county in Missouri
-
B
Income Around averageWealthiest county in Missouri
-
B
Education Around averageAmong the top 5 best educated counties in Missouri
Source: Map AI Methodology
Population: density and quick facts
| Metric | St. Charles County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Population | 414,008 | 6,186,340 | 337,468,954 |
| Population density (per sq mi) | 698.7 | 88.8 | 86.4 |
| Population growth (%/yr) | 1.09% | 0.28% | 0.59% |
| Median age | 38.7 | 37.5 | 37.3 |
| Households | 161,114 | 2,507,647 | 130,235,071 |
Population in St. Charles County grew by 20.8% from 2009 to 2024, reaching 414,008 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in St. Charles County is Millennials, aged 29–44, at 22.8% of residents. That is 1.5 points above Missouri as a whole.
- Gen Z 13–28 85,167 20.6% -0.6 pts
- Millennials 29–44 94,258 22.8% +1.5 pts
- Gen X 45–60 86,369 20.9% +1.2 pts
- Boomers 61–79 66,195 16.0% -1.9 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 50.6% of the people living in St. Charles County and men 49.4%.
- Women 50.6% Missouri 50.7%
- Men 49.4% Missouri 49.3%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in St. Charles County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
St. Charles County has a the economy index of B, which means it is quite prosperous.
| Metric | St. Charles County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Median household income | $105,635 | $70,801 | $80,455 |
| Income growth (%/yr) | 4.28% | 4.56% | 4.80% |
| Unemployment rate | 2.9% | 4.0% | 5.2% |
The median household income in St. Charles County is about 49% higher than in Missouri.
Housing
| Metric | St. Charles County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Median home price | $326,504 | $145,462 | $248,835 |
| Median rent | $1,369 | $1,033 | $1,407 |
| Homeownership rate | 80.5% | 68.1% | 65.2% |
The median home price in St. Charles County is about 19.9 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,369 per month for that long.
Commute Time & Mobility
Commuters in St. Charles County spend about 45 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 189 hours, about 7.9 full days, spent commuting.
| Metric | St. Charles County | Missouri Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 22.7 | 21.0 | 22.4 |
| Round-trip commute (min) | 45.4 | 41.9 | 44.8 |
| Yearly time spent (hours) | 189 | 175 | 187 |
| Estimated yearly cost | $5,867 | $5,415 | $5,790 |
| Work from home | 18.0% | 13.0% | 15.0% |
| Highway traffic (vehicles/day) | 14,472 | 7,545 | 8,813 |
| Local road traffic (vehicles/day) | 2,159 | 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. Charles County is 23 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. Charles County has a education index of B, which means it is quite educated.
| Metric | St. Charles County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 39.0% | 28.8% | 31.6% |
| Average household size | 2.53 | 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. Charles County has a health index of B, which means it is quite healthy.
| Metric | St. Charles County | Missouri Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 79.9 | 76.9 | 78.3 |
| Self-rated poor health | 11.5% | 19.0% | 16.3% |
| Smokers | 16.0% | 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. Charles County, MO Compared With Nearby Counties
St. Charles County, MO is the 2nd largest of the 4 counties compared here, 414,008 residents against a local median of 63,057. Where St. Charles County, MO breaks from the counties next to it is median home price, sitting 58% above the local median of $206,522 at $326,504.
Median household income tells the same story from another angle: $105,635 against a local median of $83,558, 26% above it. The one measure here that carries a verdict is median household income, and at 26% above the local median it puts St. Charles County, MO at the better end of the local range. The counties themselves sit within $98,185 of each other on median home price, a tighter band than the gap between any of them and St. Charles County, MO, which makes it a genuine outlier here rather than one end of a wide local spread. St. Charles County, MO has the highest median home price of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| St. Charles County, MO | 414,008 | $105,635 #1/4 | $326,504 #1/4 | 22.7 min #2/4 |
| St. Louis County, MO | 995,111 | $83,558 | $227,571 | 21.9 min |
| Lincoln County, MO | 63,057 | $88,874 | $206,522 | 30.7 min |
| Jersey County, IL | 21,266 | $78,198 | $129,386 | 22.8 min |
Frequently Asked Questions
Common questions about St. Charles County, Missouri.
How big is St. Charles County, Missouri by population?
About 414,008 people live in St. Charles County, Missouri, in 161,114 households of 2.5 people on average. The median age is 38.7, close to the U.S. median of 37.3.
Is St. Charles County, Missouri mostly urban or rural?
Averaged over its land area, St. Charles County, Missouri has 699 people per square mile, a density typical of a mix of suburbs, small towns and farmland. That is about 8.1 times the U.S. average of 86.
Can a typical household afford a home in St. Charles County, Missouri?
The median home costs 3.1 times the median household income ($326,504 against $105,635), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $1,369 a month takes about 16% 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. Charles County, Missouri?
Unemployment in St. Charles County, Missouri is only 2.9%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
Analyze any area in the US
Get local demographics for any address, aggregated by drive time or radius, on the interactive map.
Explore the map →