Harmon County GIS Maps
Harmon County, Oklahoma, has 2,488 residents and covers 537.2 square miles. The population declined 14.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Harmon County is 40057.
Hollis is the county's largest population center. Harmon County also includes 3 zip codes, 5 public school districts and 10 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.
Harmon County Trends
- Population
- 2,488▾
- Median Home Value
- $75,700▾
- K-12 Enrollment
- 1,526▾
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.
Harmon 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.
Harmon County Population
Harmon County had 2,488 residents in 2020. That was 14.9% lower than in 2010. Harmon County had 795 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 5 people per square mile. Some of the county's most populated postal areas include Hollis, Gould and Mangum.
Population Trend in Harmon County OK
Harmon County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Harmon County Zip Codes
Harmon County has 3 zip codes. Some of the county's most populated zip codes include Hollis (73550), Gould (73544) and Mangum (73571). Hollis is the largest zip by population, with about 2,149 residents or 86% of the county total. Together, the three largest zips account for about 98% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Harmon County OK
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 73550 | Hollis | 2,149 | ▾ -14.5% |
| 73544 | Gould | 217 | ▾ -19% |
| 73571 | Mangum | 60 | ▾ -31% |
| Download all zip code data | |||
Harmon County Zip Code populations and trends per most recent census data.
Harmon County Demographics
Harmon County has a median age of 40.3, which makes the county a little older than Oklahoma overall. About 23.4% of residents are under 18, while 20.2% 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 30.9% of the population, which points to a solid working-age base. About 16.3% of adults have a bachelor's degree or higher, above the statewide figure of 27.8%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for Harmon County OK
Median Age
40.3
Under 18
23.4%
Age 65+
20.2%
Bachelor's+
16.3%
Harmon County School Districts
Harmon County is served by 5 public school districts with 1,526 students enrolled in 2024. The largest districts on the county map are Mangum Public Schools, Hollis Public Schools and Erick Public Schools. Those three districts account for about 81% 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 Harmon County OK
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Mangum Public Schools | 606 | 39.7% | ▾ -5.3% |
| Hollis Public Schools | 456 | 29.9% | ▾ -2.8% |
| Erick Public Schools | 174 | 11.4% | ▾ -5.4% |
| Duke Public Schools | 152 | 10% | ▾ -8.4% |
| Olustee-Eldorado Public Schools | 138 | 9% | ▾ -15.9% |
| Download all school district data | |||
Harmon County school district enrollment and trends per most recent NCES reporting data.
Harmon County Housing & Real Estate
Harmon County has a median home value of $75,700 and a median gross rent of $663. 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 Oklahoma median, while rents come in below the state average. In March 2026, the median listing price was $99,500 and homes spent about 70 days on the market.
Harmon County Housing Mix
Harmon County housing mix: owner, renter and vacant units.
Harmon County Housing Trends
Harmon County median home value and rent trend (last 5 years).
Businesses in Harmon County, OK
Harmon County has 122 business listings across 79 categories. The largest categories in Harmon County business listings are Churches & Religious Organizations (10, 8.2%), Auto Repair (6, 4.9%), and Public And Government Association (5, 4.1%). The full Harmon County business listings dataset includes names, categories, addresses and contact details where available. Harmon County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Harmon County, OK
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 10 | 8.2% |
| Auto Repair | 6 | 4.9% |
| Public And Government Association | 5 | 4.1% |
| Professional Services | 4 | 3.3% |
| ATMs | 3 | 2.5% |
| Elementary School | 3 | 2.5% |
| Convenience Stores | 3 | 2.5% |
| Farming Services | 3 | 2.5% |
| Government Services | 2 | 1.6% |
| Propane Supplier | 2 | 1.6% |
Harmon County Business Listings
| Business | Category | City |
|---|---|---|
| Southwest Oklahoma Ambulance Authority | Ambulance And Ems Services | Hollis |
| Georges | American Restaurants | Hollis |
| LibertyX Bitcoin ATM | ATMs | Hollis |
| Hollis Livestock Auction | Auction House | Hollis |
| Ardry Paint and Body Works | Auto Body Shop | Hollis |
| Intoxalock Ignition Interlock | Auto Repair | Hollis |
| Great Plains Bank | Banks & Credit Unions | Hollis |
| First Baptist Church | Baptist Church | Hollis |
| Any Ol’ Barstool | Bars & Nightlife | Hollis |
| Native Blonde Salon | Beauty Salons | Hollis |
| Download Harmon County business listings | ||
Harmon County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Harmon County Basemaps
Harmon 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 Harmon County Data Package
This page shows a preview of what's included in the Harmon 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 Harmon County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.