Population
426,499
2025
+4.9% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
St. Charles County, MO: population growth, jobs and income
St. Charles County gained 3,909 residents between 2024 and 2025 (+0.9%).
St. Charles County had an estimated 426,499 residents in 2025, up 4.9% (20,092 more people) since 2020. That is faster than Missouri as a whole (+1.9%), and the 18th fastest growth of 115 counties in Missouri.
Data as of 2025 · updated
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In the St. Charles County report
One-time $99 PDF: everything on this page for St. Charles County, ranked against Missouri and the U.S., plus these figures that are not on the free page:
- Median gross rent$1,370/mo2020–24
- Vacant homes, incl. seasonal and second homes3.5%2020–24
- New homes permitted, last 12 months2,0992025-10/2026-09
- Rent growth, 5 yearsIn the report
- Permits in 5+ unit buildingsIn the report
- IRS income moving in (net AGI)In the report
- Neighbouring-county comparison tableIn the report
What's inside: 5 pages
- 1 Summary, headline numbers and ranks (free preview)
- 2 Ranks and the neighbouring-county table
- 3 Migration, with IRS mover and income flows
- 4 Rent, vacant homes, permits and employers
- 5 Every source and the methods
Headline numbers
Net domestic migration
+2,403
2025
5.6 per 1,000 residents
+12,767 in total, 2021–2025
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. People moving in from other U.S. counties minus people moving out.
Unemployment rate
3.4%
2025
+0.9 pts since 2019
Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics, 2025. Annual average unemployment rate.
New homes permitted
1,661
2025
−46.4% since 2021
3.9 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Median household income
$104,692
2020–24
+19.5% since 2016–20
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–24. American Community Survey 5-year estimate.
Private-sector employment
143,624
2023
+4.2% since 2018
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
What the numbers say
Net domestic migration added 2,403 people in 2025: more people moved in from other U.S. counties than moved out.
Private employers had 143,624 paid employees in mid-March 2023, +4.2% since 2018 (County Business Patterns).
Unemployment averaged 3.4% in 2025, 0.9 points higher than in 2019 (before the pandemic).
Builders were authorized to start 1,661 new homes in 2025, or 3.9 per 1,000 residents.
Median household income was $104,692 in the 2020–24 American Community Survey, +19.5% since 2016–20.
Across the 3,107 U.S. counties with a comparable estimate, its population growth ranks 625th.
Part of the St. Louis, MO-IL metro area.
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St. Charles County population by year
| Year | Population | Change |
|---|---|---|
| 2025 | 426,499 | +3,909 |
| 2024 | 422,590 | +5,148 |
| 2023 | 417,442 | +3,451 |
| 2022 | 413,991 | +3,423 |
| 2021 | 410,568 | +4,161 |
| 2020 | 406,407 | – |
Census Bureau population estimates, July 1 of each year.
What drove the change in St. Charles County
St. Charles County grew by 20,092 people since 2020; the largest part came from domestic migration (+12,767).
| Component | 2025 | 2020–25 | Share |
|---|---|---|---|
| Natural changebirths minus deaths | +392 | +2,241 | |
| International migrationfrom and to other countries | +1,099 | +5,230 | |
| Domestic migrationfrom and to other U.S. counties | +2,403 | +12,767 | |
| Census adjustmentbalancing residual | +15 | −146 | |
| Total change | +3,909 | +20,092 |
Census Bureau population estimates, components of change, each year July 1 to June 30. The components add up to the change in the estimate; the Census adjustment is the small balancing figure the Bureau publishes.
How it ranks
| Measure | In Missouri | Among U.S. counties |
|---|---|---|
| Population growth | 18th of 115 | 625th of 3,107 |
| Net domestic migration per 1,000 residents | 49th of 115 | 970th of 3,108 |
| Private-sector job growth | 37th of 115 | 1,332nd of 3,092 |
| Median household income | 1st of 115 | 125th of 3,107 |
| Lowest unemployment rate | 11th of 115 | 810th of 3,108 |
| New homes permitted per 1,000 residents | 14th of 113 | 851st of 3,005 |
1st = highest (lowest for unemployment). Counties are ranked only against others with a figure for the same period.
Get the county report — $99
The County Growth and Demographics Report for St. Charles County, MO as a PDF, from federal data: population and migration, housing and rents, permits, private employers and jobs, unemployment, ranks in the state and the country, and neighbouring counties, with a source next to every number. Pay once, no subscription.
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Neighbouring counties
Over 2020–25, St. Charles County's population change (+4.9%) was ahead of 5 of its 7 neighbouring counties and behind 2 (Lincoln County and Warren County).
Its median household income ($104,692, 2020–24) is higher than in all 7 of its neighbouring counties.
| County | Population2025 | Population change2020–25 | Net domestic migration per 1,000 residents2025 | Homes permitted per 1,000 residents2025 | Median household income2020–24 |
|---|---|---|---|---|---|
| St. Charles County, MO This county | 426,499 | +4.9% | 5.6 | 3.9 | $104,692 |
| St. Louis County, MO | 990,911 | −1.2% | −3.4 | 1.0 | $82,936 |
| Calhoun County, IL | 4,300 | −2.3% | −3.0 | 1.2 | $93,203 |
| Lincoln County, MO | 66,676 | +11.4% | 11.2 | 3.8 | $89,278 |
| Franklin County, MO | 108,090 | +3.1% | 6.6 | 7.3 | $73,165 |
| Warren County, MO | 39,016 | +9.2% | 12.1 | 9.2 | $81,209 |
| Jersey County, IL | 21,160 | −1.5% | 5.5 | 1.8 | $80,361 |
| Madison County, IL | 263,110 | −1.0% | 1.2 | 1.7 | $75,793 |
Census Bureau population estimates and building permits, American Community Survey 5-year income. Rates per 1,000 residents. – means no figure, or a base too small for a change or rate (it would swing on a few people). A figure from another period shows its year and is left out of the comparison.
Questions
Is St. Charles County growing?
Yes. Its population grew 4.9% between 2020 and 2025, about 20,092 more people (Census Bureau population estimates). Missouri as a whole changed +1.9% over the same years. That ranks 18th of 115 counties in Missouri for population growth.
How many people moved to St. Charles County?
On net, about 2,403 people in 2025: that many more moved in from other U.S. counties than moved out (Census Bureau net domestic migration estimate).
What is the unemployment rate in St. Charles County?
It averaged 3.4% in 2025 (BLS Local Area Unemployment Statistics, annual average).
What is the population of St. Charles County?
About 426,499 people, according to the U.S. Census Bureau's population estimate for July 1, 2025.
How many jobs are in St. Charles County?
Private employers there had 143,624 paid employees in mid-March 2023, +4.2% since 2018 (Census Bureau County Business Patterns; government jobs and the self-employed are not counted).
What Beacon CRE covers in Missouri
Map, parcel and listing layers cover North and South Carolina only for now. This page and the other Missouri county pages carry the public federal growth figures.
St. Charles County data alerts
Email me when St. Charles County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, American Community Survey 5-year estimates
- U.S. Census Bureau, County Business Patterns
Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.
Jobs outside North and South Carolina use County Business Patterns (paid private-sector employees in mid-March); wages and government jobs are not included.