St. Clair County GIS Maps
St. Clair County, Missouri, has 9,284 residents and covers 675 square miles. The population declined 5.3% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for St. Clair County is 29185.
Appleton City is the county's largest population center. St. Clair County also includes 6 zip codes, 6 public school districts and 32 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. Clair County Trends
- Population
- 9,284▾
- Median Home Value
- $142,500▴
- K-12 Enrollment
- 3,228▴
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. Clair 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. Clair County Population
St. Clair County had 9,284 residents in 2020. That was 5.3% lower than in 2010. St. Clair County had 368 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 14 people per square mile. Some of the county's most populated postal areas include Osceola, Appleton City and 64763 - Lowry City 29185.
Population Trend in St. Clair County MO
St. Clair County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Clair County Zip Codes
St. Clair County has 6 zip codes. Some of the county's most populated zip codes include Osceola (64776), Appleton City (64724) and Lowry City (64763). Osceola is the largest zip by population, with about 3,651 residents or 39% of the county total. Together, the three largest zips account for about 74% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Clair County MO
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 64776 | Osceola | 3,651 | ▾ -7.4% |
| 64724 | Appleton City | 1,755 | ▾ -5.6% |
| 64763 | Lowry City | 1,481 | ▾ -5.5% |
| 64738 | Collins | 1,138 | ▾ -1% |
| 64780 | Rockville | 544 | ▾ -14.9% |
| Download all zip code data | |||
St. Clair County Zip Code populations and trends per most recent census data.
St. Clair County Demographics
St. Clair County has a median age of 47.2, which makes the county a little older than Missouri overall. About 21% of residents are under 18, while 25.8% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 65 and over at about 25.8% of the population, which points to an older population profile. About 13.7% 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. Clair County MO
Median Age
47.2
Under 18
21%
Age 65+
25.8%
Bachelor's+
13.7%
St. Clair County School Districts
St. Clair County is served by 6 public school districts with 3,228 students enrolled in 2024. The largest districts on the county map are El Dorado Springs R-II, Osceola and Lakeland R-III. Those three districts account for about 68% 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. Clair County MO
| District | Enrollment | Share | Trend |
|---|---|---|---|
| El Dorado Springs R-II School District | 1,151 | 35.7% | ▴ 1.6% |
| Osceola School District | 563 | 17.4% | ▾ -0.5% |
| Lakeland R-III School District | 475 | 14.7% | ▴ 1.1% |
| Weaubleau R-III School District | 363 | 11.2% | ▾ -2.9% |
| Humansville R-IV School District | 345 | 10.7% | ▴ 5.8% |
| Download all school district data | |||
St. Clair County school district enrollment and trends per most recent NCES reporting data.
St. Clair County Housing & Real Estate
St. Clair County has a median home value of $142,500 and a median gross rent of $607. About 76% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Missouri median, while rents come in below the state average. In March 2026, the median listing price was $235,000 and homes spent about 112 days on the market.
St. Clair County Housing Mix
St. Clair County housing mix: owner, renter and vacant units.
St. Clair County Housing Trends
St. Clair County median home value and rent trend (last 5 years).
Businesses in St. Clair County, MO
St. Clair County has 392 business listings across 169 categories. The largest categories in St. Clair County business listings are Churches & Religious Organizations (26, 6.6%), Gas Stations (10, 2.6%), and Convenience Stores (10, 2.6%). The full St. Clair County business listings dataset includes names, categories, addresses and contact details where available. St. Clair 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. Clair County, MO
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 26 | 6.6% |
| Gas Stations | 10 | 2.6% |
| Convenience Stores | 10 | 2.6% |
| Structure And Geography | 7 | 1.8% |
| Antique Store | 6 | 1.5% |
| Public And Government Association | 6 | 1.5% |
| Restaurants | 6 | 1.5% |
| Beauty Salons | 6 | 1.5% |
| Propane Supplier | 6 | 1.5% |
| Elementary School | 6 | 1.5% |
St. Clair County Business Listings
| Business | Category | City |
|---|---|---|
| Berry Bend Truman Lake | Active Life | Warsaw |
| C & M Farm Supply | Agricultural Service | Humansville |
| Appleton City Feed Service | Agriculture | Appleton City |
| Osceola Municipal Airport | Airport | Osceola |
| Landmark Restaurant | American Restaurants | Lowry City |
| Helen M. Johnson Memorial Animal Shelter | Animal Shelters | Osceola |
| Trade Fair Mall | Antique Store | Osceola |
| The Exchange Network | ATMs | Osceola |
| Crowes Crossing Public Use Area | Attractions And Activities | Osceola |
| Wheeler Livestock Auction | Auction House | Osceola |
| Download St. Clair County business listings | ||
St. Clair County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Clair County Data Package
This page shows a preview of what's included in the St. Clair 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.
One-time · instant download · 30-day refund guarantee · See full package details
Preview a Live Package Demo
See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Missouri — explore the full structure before you buy.
No email or download required. Opens in a preview window on this page.
Nearby Counties
Browse county data pages for the counties that border St. Clair County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.