Sullivan County GIS Maps
Sullivan County, Missouri, has 5,999 residents and covers 648 square miles. The population declined 10.6% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Sullivan County is 29211.
Milan is the county's largest population center. Sullivan County also includes 7 zip codes, 5 public school districts and 29 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.
Sullivan County Trends
- Population
- 5,999▾
- Median Home Value
- $103,300▴
- K-12 Enrollment
- 892▾
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.
Sullivan 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.
Sullivan County Population
Sullivan County had 5,999 residents in 2020. That was 10.6% lower than in 2010. Sullivan County had 1,220 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 9 people per square mile. Some of the county's most populated postal areas include Milan, Green Castle and Browning.
Population Trend in Sullivan County MO
Sullivan County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Sullivan County Zip Codes
Sullivan County has 7 zip codes. Some of the county's most populated zip codes include Milan (63556), Green Castle (63545) and Browning (64630). Milan is the largest zip by population, with about 3,452 residents or 58% of the county total. Together, the three largest zips account for about 82% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Sullivan County MO
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 63556 | Milan | 3,452 | ▾ -8.7% |
| 63545 | Green Castle | 939 | ▾ -15.5% |
| 64630 | Browning | 547 | ▾ -9.1% |
| 64646 | Galt | 306 | ▴ 3% |
| 64667 | Newtown | 292 | ▾ -26.1% |
| Download all zip code data | |||
Sullivan County Zip Code populations and trends per most recent census data.
Sullivan County Demographics
Sullivan County has a median age of 44.2, which makes the county a little older than Missouri overall. About 22% of residents are under 18, while 20.5% 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 28.3% of the population, which points to a solid working-age base. About 14.7% of adults have a bachelor's degree or higher, above the statewide figure of 31.9%. The county is majority White by population, with Hispanic, Asian, Black and multiracial residents making up a meaningful share of the local mix.
Key Demographics for Sullivan County MO
Median Age
44.2
Under 18
22%
Age 65+
20.5%
Bachelor's+
14.7%
Sullivan County School Districts
Sullivan County is served by 5 public school districts with 892 students enrolled in 2024. The largest districts on the county map are Green City R-I, Milan C-2 and Linn County R-I. Those three districts account for about 78% 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 Sullivan County MO
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Green City R-I School District | 264 | 29.6% | ▾ -4% |
| Milan C-2 School District | 258 | 28.9% | ▾ -59% |
| Linn County R-I School District | 171 | 19.2% | ▾ -0.6% |
| Grundy County R-V School District | 122 | 13.7% | ▾ -10.9% |
| Newtown-Harris R-III School District | 77 | 8.6% | ▾ -8.3% |
| Download all school district data | |||
Sullivan County school district enrollment and trends per most recent NCES reporting data.
Sullivan County Housing & Real Estate
Sullivan County has a median home value of $103,300 and a median gross rent of $692. About 74% 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 $234,000 and homes spent about 60 days on the market.
Sullivan County Housing Mix
Sullivan County housing mix: owner, renter and vacant units.
Sullivan County Housing Trends
Sullivan County median home value and rent trend (last 5 years).
Businesses in Sullivan County, MO
Sullivan County has 214 business listings across 118 categories. The largest categories in Sullivan County business listings are Churches & Religious Organizations (8, 3.7%), Gas Stations (7, 3.3%), and Banks & Credit Unions (7, 3.3%). The full Sullivan County business listings dataset includes names, categories, addresses and contact details where available. Sullivan County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Sullivan County, MO
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 8 | 3.7% |
| Gas Stations | 7 | 3.3% |
| Banks & Credit Unions | 7 | 3.3% |
| Shipping Center | 6 | 2.8% |
| Baptist Church | 4 | 1.9% |
| Cafe | 4 | 1.9% |
| Chicken Restaurant | 4 | 1.9% |
| Mexican Restaurants | 4 | 1.9% |
| Grocery Stores | 4 | 1.9% |
| Auto Repair | 4 | 1.9% |
Sullivan County Business Listings
| Business | Category | City |
|---|---|---|
| Nickels & Dimes Bookkeeping and Tax Service | Accountant | Milan |
| Middle of Nowhere Ranch | Active Life | Harris |
| Mower Shop Ag Repair Diesel Performance | Agricultural Service | Milan |
| Ag Products LLC. | Agriculture | Milan |
| Sullivan County Ambulance District | Ambulance And Ems Services | Milan |
| Reger Hideout | American Restaurants | Milan |
| The Arts Incubator - Green City, MO | Art Gallery | Green City |
| LibertyX Bitcoin ATM | ATMs | Milan |
| Mussel Fork Outfitters | Attractions And Activities | Sullivan County |
| North Missouri Livestock Auction | Auction House | Milan |
| Download Sullivan County business listings | ||
Sullivan County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Sullivan County Basemaps
Sullivan 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 Sullivan County Data Package
This page shows a preview of what's included in the Sullivan 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 Sullivan County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.