Grant County GIS Maps
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Grant County, South Dakota, has 7,556 residents and covers 681.5 square miles. The population grew 2.7% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Grant County is 46051.
Milbank is the county's largest population center. Grant County also includes 10 zip codes, 7 public school districts and 50 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.
Grant County Trends
- Population
- 7,556▴
- Median Home Value
- $179,400▴
- K-12 Enrollment
- 5,534▾
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.
Grant 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.
Grant County Population
Grant County had 7,556 residents in 2020. That was 2.7% higher than in 2010. Grant County had 291 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 11 people per square mile. Some of the county's most populated postal areas include Milbank, Big Stone City and Summit.
Population Trend in Grant County SD
Grant County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Grant County Zip Codes
Grant County has 10 zip codes. Some of the county's most populated zip codes include Milbank (57252), Big Stone City (57216) and Summit (57266). Milbank is the largest zip by population, with about 5,020 residents or 66% of the county total. Together, the three largest zips account for about 88% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Grant County SD
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 57252 | Milbank | 5,020 | ▴ 4.6% |
| 57216 | Big Stone City | 1,037 | ▾ -0.7% |
| 57266 | Summit | 599 | ▾ -1.3% |
| 57259 | Revillo | 453 | ▾ -10.3% |
| 57269 | Twin Brooks | 387 | ▾ -6.3% |
| Download all zip code data | |||
Grant County Zip Code populations and trends per most recent census data.
Grant County Demographics
Grant County has a median age of 43.7, which makes the county a little older than South Dakota overall. About 21.9% of residents are under 18, while 23.1% 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 26.4% of the population, which points to a solid working-age base. About 25.5% of adults have a bachelor's degree or higher, above the statewide figure of 31.1%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Grant County SD
Median Age
43.7
Under 18
21.9%
Age 65+
23.1%
Bachelor's+
25.5%
Grant County School Districts
Grant County is served by 7 public school districts with 5,534 students enrolled in 2024. The largest districts on the county map are Watertown 14-4, Milbank 25-4 and Waverly 14-5. Those three districts account for about 88% 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 Grant County SD
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Watertown School District 14-4 | 3,606 | 65.2% | ▾ -2.3% |
| Milbank School District 25-4 | 973 | 17.6% | ▾ -4% |
| Waverly School District 14-5 | 283 | 5.1% | ▴ 7.6% |
| Wilmot School District 54-7 | 234 | 4.2% | ▴ 0.4% |
| Summit School District 54-6 | 182 | 3.3% | ▾ -2.2% |
| Download all school district data | |||
Grant County school district enrollment and trends per most recent NCES reporting data.
Grant County Housing & Real Estate
Grant County has a median home value of $179,400 and a median gross rent of $668. About 82% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the South Dakota median, while rents come in below the state average. In March 2026, the median listing price was $284,000 and homes spent about 37 days on the market.
Grant County Housing Mix
Grant County housing mix: owner, renter and vacant units.
Grant County Housing Trends
Grant County median home value and rent trend (last 5 years).
Businesses in Grant County, SD
Grant County has 420 business listings across 204 categories. The largest categories in Grant County business listings are Churches & Religious Organizations (18, 4.3%), Gas Stations (10, 2.4%), and Bars & Nightlife (10, 2.4%). The full Grant County business listings dataset includes names, categories, addresses and contact details where available. Grant County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Grant County, SD
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 18 | 4.3% |
| Gas Stations | 10 | 2.4% |
| Bars & Nightlife | 10 | 2.4% |
| Beauty Salons | 7 | 1.7% |
| Chiropractors | 6 | 1.4% |
| Flowers & Gifts | 6 | 1.4% |
| Farm | 6 | 1.4% |
| Grocery Stores | 6 | 1.4% |
| Auto Repair | 5 | 1.2% |
| Car Dealerships | 5 | 1.2% |
Grant County Business Listings
| Business | Category | City |
|---|---|---|
| ACT Accurate Tax & Bookkeeping | Accountant | Milbank |
| Atlas Target Works | Active Life | Goodwin |
| ReNu Acupuncture | Acupuncture | Milbank |
| Revillo Farmers Elevator | Agricultural Cooperatives | Revillo |
| Western Consolidated Cooperative | Agricultural Service | Twin Brooks |
| Milbank Municipal Airport (1D1) | Airport | Milbank |
| Millstone Family Restaurant | American Restaurants | Milbank |
| Treasure Pit | Antique Store | Big Stone City |
| Clay House | Arts And Crafts | Big Stone City |
| Popper's Fireworks | Arts And Entertainment | Milbank |
| Download Grant County business listings | ||
Grant County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Grant County Basemaps
Grant 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 Grant County Data Package
This page shows a preview of what's included in the Grant 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 Grant County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.