St. Louis County GIS Maps
St. Louis County, Missouri, has 293,109 residents and covers 61.7 square miles. The FIPS code for St. Louis County is 29510. University City is the county's largest population center. St. Louis County also includes 19 zip codes, 1 public school district and 15 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. Louis County Trends
- Population
- 293,109—
- Median Home Value
- $185,100▴
- K-12 Enrollment
- 17,933▾
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. Louis 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. Louis County Population
St. Louis County had 293,109 residents in 2020. Recent census data shows how the county has changed over time. Long-term census counts show how the county has changed across recent decades. University City is the largest city in the county, with about 35,065 residents. Some of the county's most populated postal areas include Saint Louis, Saint Louis and Saint Louis.
Population Trend in St. Louis County MO
St. Louis County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Louis County Zip Codes
St. Louis County has 19 zip codes. Some of the county's most populated zip codes include Saint Louis (63116), Saint Louis (63109) and Saint Louis (63118). The largest zip areas account for a meaningful share of the county population. Together, the three largest zips account for about 0% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Louis County MO
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 63116 | Saint Louis | 41,959 | ▾ -3.6% |
| 63109 | Saint Louis | 26,777 | ▾ -0.6% |
| 63118 | Saint Louis | 25,194 | ▾ -5.7% |
| 63108 | Saint Louis | 23,603 | ▴ 9.4% |
| 63139 | Saint Louis | 21,971 | ▾ -3.6% |
| Download all zip code data | |||
St. Louis County Zip Code populations and trends per most recent census data.
St. Louis County Demographics
St. Louis County has a median age of 36.6, which makes the county a little younger than Missouri overall. About 18.6% of residents are under 18, while 14.9% 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 39.6% of the population, which points to a solid working-age base. About 40.2% of adults have a bachelor's degree or higher, above the statewide figure of 31.9%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for St. Louis County MO
Median Age
36.6
Under 18
18.6%
Age 65+
14.9%
Bachelor's+
40.2%
St. Louis County School Districts
St. Louis County is served by 1 public school district with 17,933 students enrolled in 2024. Several larger districts account for a substantial share of students across the county map area. Those three districts account for about 100% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in St. Louis County MO
| District | Enrollment | Share | Trend |
|---|---|---|---|
| St. Louis City School District | 17,933 | 100% | ▾ -1.9% |
| Download all school district data | |||
St. Louis County school district enrollment and trends per most recent NCES reporting data.
St. Louis County Housing & Real Estate
St. Louis County has a median home value of $185,100 and a median gross rent of $978. About 45% 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 $200,000 and homes spent about 45 days on the market.
St. Louis County Housing Mix
St. Louis County housing mix: owner, renter and vacant units.
St. Louis County Housing Trends
St. Louis County median home value and rent trend (last 5 years).
Businesses in St. Louis County, MO
St. Louis County has 14,154 business listings across 917 categories. The largest categories in St. Louis County business listings are Churches & Religious Organizations (465, 3.3%), Landmark And Historical Building (373, 2.6%), and Community & Nonprofits (369, 2.6%). The full St. Louis County business listings dataset includes names, categories, addresses and contact details where available. St. Louis 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. Louis County, MO
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 465 | 3.3% |
| Landmark And Historical Building | 373 | 2.6% |
| Community & Nonprofits | 369 | 2.6% |
| Parks & Recreation | 183 | 1.3% |
| Restaurants | 183 | 1.3% |
| Event Planning | 182 | 1.3% |
| Professional Services | 171 | 1.2% |
| Bars & Nightlife | 171 | 1.2% |
| Auto Repair | 161 | 1.1% |
| Gas Stations | 154 | 1.1% |
St. Louis County Business Listings
| Business | Category | City |
|---|---|---|
| Design Hub 360 Custom T Shirts & Apparel - St. Louis | 3D Printing Service | St. Louis |
| Harris House Treatment and Recovery Center | Abuse And Addiction Treatment | St Louis |
| Saint Louis University Bookstore | Academic Bookstore | St Louis |
| West Pine Lofts | Accommodation | St Louis |
| Anders CPAs + Advisors | Accountant | St Louis |
| The Green Seats at Busch Stadium | Active Life | St Louis |
| Southside Chiropractic and Acupuncture | Acupuncture | St Louis |
| Pure Pleasure Adult Megacenter | Adult Entertainment | St Louis |
| T-shirt Headquarters Boutique | Adult Store | Saint Louis |
| Drive Social Media | Advertising Agency | St Louis |
| Download St. Louis County business listings | ||
St. Louis County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Louis County Data Package
This page shows a preview of what's included in the St. Louis 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. Louis County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.