Martin County GIS Maps
Martin County, Minnesota, has 20,025 residents and covers 712.3 square miles. The population declined 3.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Martin County is 27091.
Fairmont is the county's largest population center. Martin County also includes 11 zip codes, 6 public school districts and 49 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.
Martin County Trends
- Population
- 20,025▾
- Median Home Value
- $158,800▴
- K-12 Enrollment
- 4,372▴
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.
Martin 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.
Martin County Population
Martin County had 20,025 residents in 2020. That was 3.9% lower than in 2010. Martin County had 1,777 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 28 people per square mile. Some of the county's most populated postal areas include Fairmont, Truman and Sherburn.
Population Trend in Martin County MN
Martin County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Martin County Zip Codes
Martin County has 11 zip codes. Some of the county's most populated zip codes include Fairmont (56031), Truman (56088) and Sherburn (56171). Fairmont is the largest zip by population, with about 12,117 residents or 61% of the county total. Together, the three largest zips account for about 78% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Martin County MN
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 56031 | Fairmont | 12,117 | ▾ -2.3% |
| 56088 | Truman | 1,881 | ▾ -3.3% |
| 56171 | Sherburn | 1,676 | ▾ -8% |
| 56181 | Welcome | 1,144 | ▾ -0.3% |
| 56176 | Trimont | 1,092 | ▾ -4% |
| Download all zip code data | |||
Martin County Zip Code populations and trends per most recent census data.
Martin County Demographics
Martin County has a median age of 44.5, which makes the county a little older than Minnesota overall. About 22.6% of residents are under 18, while 24% 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 26.7% of the population, which points to a solid working-age base. About 23.8% of adults have a bachelor's degree or higher, above the statewide figure of 38.8%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Martin County MN
Median Age
44.5
Under 18
22.6%
Age 65+
24%
Bachelor's+
23.8%
Martin County School Districts
Martin County is served by 6 public school districts with 4,372 students enrolled in 2024. The largest districts on the county map are Fairmont Area, St. James Public and Martin County West. Those three districts account for about 83% 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 Martin County MN
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Fairmont Area School District | 1,846 | 42.2% | ▴ 1.5% |
| St. James Public School District | 1,143 | 26.1% | ▾ -0.6% |
| Martin County West School District | 624 | 14.3% | ▾ -1% |
| Granada-Huntley-East Chain | 317 | 7.3% | ▴ 4.6% |
| Truman Public School District | 229 | 5.2% | ▾ -5% |
| Download all school district data | |||
Martin County school district enrollment and trends per most recent NCES reporting data.
Martin County Housing & Real Estate
Martin County has a median home value of $158,800 and a median gross rent of $735. About 72% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Minnesota median, while rents come in below the state average. In March 2026, the median listing price was $207,500 and homes spent about 78 days on the market.
Martin County Housing Mix
Martin County housing mix: owner, renter and vacant units.
Martin County Housing Trends
Martin County median home value and rent trend (last 5 years).
Businesses in Martin County, MN
Martin County has 1,048 business listings across 327 categories. The largest categories in Martin County business listings are Churches & Religious Organizations (41, 3.9%), Auto Repair (24, 2.3%), and Insurance Agencies (23, 2.2%). The full Martin County business listings dataset includes names, categories, addresses and contact details where available. Martin County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Martin County, MN
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 41 | 3.9% |
| Auto Repair | 24 | 2.3% |
| Insurance Agencies | 23 | 2.2% |
| Lake | 23 | 2.2% |
| Parks & Recreation | 22 | 2.1% |
| Elementary School | 18 | 1.7% |
| Chiropractors | 17 | 1.6% |
| Banks & Credit Unions | 17 | 1.6% |
| Financial Service | 15 | 1.4% |
| Public And Government Association | 15 | 1.4% |
Martin County Business Listings
| Business | Category | City |
|---|---|---|
| Recovery in Motion | Abuse And Addiction Treatment | Fairmont |
| Linda Thate Eisenmenger CPA | Accountant | Fairmont |
| Pioneer Pontoon Rentals | Active Life | Fairmont |
| Optimal Health & Chiropractic Clinic | Acupuncture | Fairmont |
| AdMfg, Inc. | Advertising Agency | Fairmont |
| Central Farm Service | Agricultural Cooperatives | Truman |
| Hen-Way Manufacturing | Agricultural Service | Fairmont |
| Shoen Holdfast Farm | Agriculture | Truman |
| Fairmont Municipal Airport | Airport | Fairmont |
| Bean Town Grill | American Restaurants | Fairmont |
| Download Martin County business listings | ||
Martin County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Martin County Basemaps
Martin 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 Martin County Data Package
This page shows a preview of what's included in the Martin 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 Martin County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.