Washington County GIS Maps
Washington County, Missouri, has 23,514 residents across 23,972 parcels and covers 759.9 square miles. The population declined 6.7% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Washington County is 29221.
Potosi is the county's largest population center. Washington County also includes 10 zip codes, 7 public school districts and 26 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 parcel data, population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers, Parcels and sample data. Paid packages add full layers, analytics and database files.
Washington County Trends
- Population
- 23,514▾
- Median Home Value
- $118,400▴
- K-12 Enrollment
- 7,458▾
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.
Washington 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.
Washington County Parcels
Washington County has 23,972 mapped parcels covering 386,535 acres. Residential accounts for 60.5% of parcels. Agricultural land follows at 18.5% and agricultural dwellings at 15.6%. The records carry 18,142 distinct owner names. Owner names are on nearly every parcel. Site addresses reach 56.1%. Browse the interactive Washington County Parcel viewer here.
Washington County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 23,972 | 100% |
| Owner name | 23,971 | 99.9% |
| Owner mailing address | 0 | 0% |
| Site address | 13,440 | 56.1% |
| Land use code | 0 | 0% |
| Land use description | 23,972 | 100% |
| Assessed value | 0 | 0% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 0 | 0% |
| Parcel boundary | 23,972 | 100% |
| Download all Washington County parcels. | ||
Field coverage measured across all Washington County parcel records.
Washington County Population
Washington County had 23,514 residents in 2020. That was 6.7% lower than in 2010. Washington County added 170 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 31 people per square mile. Some of the county's most populated postal areas include Potosi, Cadet and Mineral Point.
Population Trend in Washington County MO
Washington County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Washington County Zip Codes
Washington County has 10 zip codes. Some of the county's most populated zip codes include Potosi (63664), Cadet (63630) and Mineral Point (63660). Potosi is the largest zip by population, with about 8,333 residents or 35% of the county total. Together, the three largest zips account for about 69% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Washington County MO
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 63664 | Potosi | 8,333 | ▾ -6.6% |
| 63630 | Cadet | 4,169 | ▴ 2.6% |
| 63660 | Mineral Point | 3,699 | ▾ -13.5% |
| 63648 | Irondale | 1,348 | ▾ -17.2% |
| 63071 | Richwoods | 1,094 | ▾ -0.8% |
| Download all zip code data | |||
Washington County Zip Code populations and trends per most recent census data.
Washington County Demographics
Washington County has a median age of 40.2, which makes the county a little older than Missouri overall. About 23.3% of residents are under 18, while 17.4% 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 30.8% of the population, which points to a solid working-age base. About 12.4% 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 Washington County MO
Median Age
40.2
Under 18
23.3%
Age 65+
17.4%
Bachelor's+
12.4%
Washington County School Districts
Washington County is served by 7 public school districts with 7,458 students enrolled in 2024. The largest districts on the county map are Potosi R-III, Sullivan C-2 and West St. Francois County R-IV. Those three districts account for about 67% 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 Washington County MO
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Potosi R-III School District | 2,110 | 28.3% | ▴ 3% |
| Sullivan C-2 School District | 1,941 | 26% | ▾ -3.8% |
| West St. Francois County R-IV School District | 935 | 12.5% | ▾ -1.9% |
| Kingston K-14 School District | 831 | 11.1% | ▴ 3% |
| Crawford County R-I School District | 827 | 11.1% | ▾ -1.9% |
| Download all school district data | |||
Washington County school district enrollment and trends per most recent NCES reporting data.
Washington County Housing & Real Estate
Washington County has a median home value of $118,400 and a median gross rent of $680. 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 $217,998 and homes spent about 69 days on the market.
Washington County Housing Mix
Washington County housing mix: owner, renter and vacant units.
Washington County Housing Trends
Washington County median home value and rent trend (last 5 years).
Businesses in Washington County, MO
Washington County has 783 business listings across 266 categories. The largest categories in Washington County business listings are Churches & Religious Organizations (41, 5.2%), Auto Repair (21, 2.7%), and River (19, 2.4%). The full Washington County business listings dataset includes names, categories, addresses and contact details where available. Washington County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Washington County, MO
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 41 | 5.2% |
| Auto Repair | 21 | 2.7% |
| River | 19 | 2.4% |
| Farm | 17 | 2.2% |
| Structure And Geography | 16 | 2.0% |
| Pizza Restaurants | 15 | 1.9% |
| Lake | 15 | 1.9% |
| Convenience Stores | 14 | 1.8% |
| Baptist Church | 14 | 1.8% |
| Propane Supplier | 12 | 1.5% |
Washington County Business Listings
| Business | Category | City |
|---|---|---|
| McFarland - IBM (Interstate Business Management) | Accountant | Potosi |
| Woodland Lakes Pool | Active Life | Sullivan |
| General Signs & Graphics | Advertising Agency | Irondale |
| Sunlight Feed & Farm Center | Agricultural Service | Potosi |
| Washington County Airport | Airport | Mineral Point |
| Potosi Manor | Alternative Medicine | Potosi |
| Washington County Ambulance District | Ambulance And Ems Services | Mineral Point |
| Backwoods Convenience Bar and Grill | American Restaurants | Mineral Point |
| The Cabin In The Woods LLC | Amusement Park | Mineral Point |
| Vintage Charm | Antique Store | Potosi |
| Download Washington County business listings | ||
Washington County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Washington County Basemaps
Washington County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Washington County Data Package
This page shows a preview of what's included in the Washington 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 parcels, 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 Washington County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.