St. Charles County GIS Maps
St. Charles County, Missouri, has 405,262 residents and covers 560.5 square miles. The population grew 12.4% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for St. Charles County is 29183.
O'Fallon is the county's largest population center. St. Charles County also includes 14 zip codes, 6 public school districts and 33 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
St. Charles County Trends
- Population
- 405,262▴
- Median Home Value
- $296,800▴
- K-12 Enrollment
- 62,234▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
St. Charles County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
St. Charles County Population
St. Charles County had 405,262 residents in 2020. That was 12.4% higher than in 2010. St. Charles County added 121,379 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 723 people per square mile. Some of the county's most populated postal areas include Saint Peters, O Fallon and 63301 - Saint Charles 29183.
Population Trend in St. Charles County MO
St. Charles County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Charles County Zip Codes
St. Charles County has 14 zip codes. Some of the county's most populated zip codes include Saint Peters (63376), O Fallon (63366) and Saint Charles (63301). Saint Peters is the largest zip by population, with about 76,064 residents or 19% of the county total. Together, the three largest zips account for about 45% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Charles County MO
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 63376 | Saint Peters | 76,064 | ▴ 7.4% |
| 63366 | O Fallon | 53,861 | ▴ 16.6% |
| 63301 | Saint Charles | 50,890 | ▴ 4.9% |
| 63385 | Wentzville | 47,756 | ▴ 33.6% |
| 63303 | Saint Charles | 47,292 | ▴ 3.2% |
| Download all zip code data | |||
St. Charles County Zip Code populations and trends per most recent census data.
St. Charles County Demographics
St. Charles County has a median age of 39.6, which makes the county a little older than Missouri overall. About 22.8% of residents are under 18, while 16.4% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 32.7% of the population, which points to a solid working-age base. About 42.4% of adults have a bachelor's degree or higher, above the statewide figure of 31.9%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for St. Charles County MO
Median Age
39.6
Under 18
22.8%
Age 65+
16.4%
Bachelor's+
42.4%
St. Charles County School Districts
St. Charles County is served by 6 public school districts with 62,234 students enrolled in 2024. The largest districts on the county map are Wentzville R-IV, Francis Howell R-III and Fort Zumwalt R-II. Those three districts account for about 83% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, based on district totals from 2017 to 2024.
Largest School Districts by Enrollment in St. Charles County MO
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Wentzville R-IV School District | 17,973 | 28.9% | ▴ 0.2% |
| Francis Howell R-III School District | 17,047 | 27.4% | ▾ -1.1% |
| Fort Zumwalt R-II School District | 16,698 | 26.8% | ▾ -0.8% |
| St. Charles R-VI School District | 4,732 | 7.6% | ▴ 0.7% |
| Washington School District | 3,543 | 5.7% | ▴ 1.6% |
| Download all school district data | |||
St. Charles County school district enrollment and trends per most recent NCES reporting data.
St. Charles County Housing & Real Estate
St. Charles County has a median home value of $296,800 and a median gross rent of $1,312. About 81% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Missouri median, while rents come in above the state average. In March 2026, the median listing price was $439,225 and homes spent about 48 days on the market.
St. Charles County Housing Mix
St. Charles County housing mix: owner, renter and vacant units.
St. Charles County Housing Trends
St. Charles County median home value and rent trend (last 5 years).
Businesses in St. Charles County, MO
St. Charles County has 14,390 business listings across 946 categories. The largest categories in St. Charles County business listings are Insurance Agencies (275, 1.9%), Real Estate Agents (246, 1.7%), and Churches & Religious Organizations (236, 1.6%). The full St. Charles County business listings dataset includes names, categories, addresses and contact details where available. St. Charles County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in St. Charles County, MO
| Category | Businesses | Share |
|---|---|---|
| Insurance Agencies | 275 | 1.9% |
| Real Estate Agents | 246 | 1.7% |
| Churches & Religious Organizations | 236 | 1.6% |
| Contractors | 219 | 1.5% |
| Auto Repair | 197 | 1.4% |
| Banks & Credit Unions | 184 | 1.3% |
| ATMs | 175 | 1.2% |
| Chiropractors | 175 | 1.2% |
| Hair Salons | 158 | 1.1% |
| Medical Offices | 156 | 1.1% |
St. Charles County Business Listings
| Business | Category | City |
|---|---|---|
| Westover Graphics | 3D Printing Service | Saint Charles |
| Creative Recovery Center | Abuse And Addiction Treatment | St Peters |
| Sun River Village | Accommodation | St Peters |
| Wamhoff Accounting Services | Accountant | St Charles |
| Wentzville Parks & Recreation | Active Life | Wentzville |
| Wheeler Acupuncture and Functional Wellness | Acupuncture | St Charles |
| Addiction Rehab St. Peters | Addiction Rehabilitation Center | St. Peters |
| Campbell Montessori School Adult Community | Adult Education | Saint Peters |
| Patricia's | Adult Entertainment | St Peters |
| Turn The Page St Louis | Advertising Agency | Cottleville |
| Download St. Charles County business listings | ||
St. Charles County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Charles County Data Package
This page shows a preview of what's included in the St. Charles County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border St. Charles County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.