Mahaska County GIS Maps
Mahaska County, Iowa, has 22,190 residents across 22,895 parcels and covers 570.9 square miles. The population declined 0.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Mahaska County is 19123.
Oskaloosa is the county's largest population center. Mahaska County also includes 9 zip codes, 7 public school districts and 35 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.
Mahaska County Trends
- Population
- 22,190▾
- Median Home Value
- $140,900▴
- K-12 Enrollment
- 6,998▾
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.
Mahaska 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.
Mahaska County Parcels
Mahaska County has 22,895 mapped parcels covering 360,863 acres. The median assessed value is $82,770. The median lot size is 34.64 acres. 9,895 parcels are 10 acres or larger. The records carry 9,584 distinct owner names. Owner names are on nearly every parcel. Assessed values reach 97.9%. Lot sizes reach 54.1%. Browse the interactive Mahaska County Parcel viewer here.
Mahaska County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 22,895 | 100% |
| Owner name | 22,790 | 99.5% |
| Owner mailing address | 0 | 0% |
| Site address | 10,461 | 45.7% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 22,421 | 97.9% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 12,397 | 54.1% |
| Parcel boundary | 22,895 | 100% |
| Download all Mahaska County parcels. | ||
Field coverage measured across all Mahaska County parcel records.
Mahaska County Population
Mahaska County had 22,190 residents in 2020. That was 0.9% lower than in 2010. Mahaska County had 145 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 39 people per square mile. Some of the county's most populated postal areas include Oskaloosa, New Sharon and Fremont.
Population Trend in Mahaska County IA
Mahaska County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Mahaska County Zip Codes
Mahaska County has 9 zip codes. Some of the county's most populated zip codes include Oskaloosa (52577), New Sharon (50207) and Fremont (52561). Oskaloosa is the largest zip by population, with about 14,974 residents or 67% of the county total. Together, the three largest zips account for about 83% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Mahaska County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 52577 | Oskaloosa | 14,974 | ▾ -0.5% |
| 50207 | New Sharon | 2,495 | ▾ -1.7% |
| 52561 | Fremont | 901 | ▾ -6.3% |
| 50143 | Leighton | 568 | ▾ -5.3% |
| 52586 | Rose Hill | 496 | ▾ -4.8% |
| Download all zip code data | |||
Mahaska County Zip Code populations and trends per most recent census data.
Mahaska County Demographics
Mahaska County has a median age of 39.1, which is close to the Iowa average. About 23.9% of residents are under 18, while 19% 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 28.8% of the population, which points to a solid working-age base. About 23% of adults have a bachelor's degree or higher, above the statewide figure of 30.9%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Mahaska County IA
Median Age
39.1
Under 18
23.9%
Age 65+
19%
Bachelor's+
23%
Mahaska County School Districts
Mahaska County is served by 7 public school districts with 6,998 students enrolled in 2024. The largest districts on the county map are Pella Community, Oskaloosa Community and Eddyville-Blakesburg-Fremont Community. 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 Mahaska County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Pella Community School District | 2,462 | 35.2% | ▾ -0.6% |
| Oskaloosa Community School District | 2,048 | 29.3% | ▾ -2.1% |
| Eddyville-Blakesburg-Fremont Community School District | 916 | 13.1% | ▴ 0.4% |
| North Mahaska Community School District | 576 | 8.2% | ▾ -4% |
| Lynnville-Sully Community School District | 505 | 7.2% | ▾ -0.6% |
| Download all school district data | |||
Mahaska County school district enrollment and trends per most recent NCES reporting data.
Mahaska County Housing & Real Estate
Mahaska County has a median home value of $140,900 and a median gross rent of $821. About 68% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Iowa median, while rents come in below the state average. In March 2026, the median listing price was $202,400 and homes spent about 76 days on the market.
Mahaska County Housing Mix
Mahaska County housing mix: owner, renter and vacant units.
Mahaska County Housing Trends
Mahaska County median home value and rent trend (last 5 years).
Businesses in Mahaska County, IA
Mahaska County has 1,040 business listings across 336 categories. The largest categories in Mahaska County business listings are Churches & Religious Organizations (50, 4.8%), Auto Repair (22, 2.1%), and Insurance Agencies (20, 1.9%). The full Mahaska County business listings dataset includes names, categories, addresses and contact details where available. Mahaska County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Mahaska County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 50 | 4.8% |
| Auto Repair | 22 | 2.1% |
| Insurance Agencies | 20 | 1.9% |
| Hair Salons | 18 | 1.7% |
| Parks & Recreation | 18 | 1.7% |
| Contractors | 16 | 1.5% |
| Community & Nonprofits | 16 | 1.5% |
| Beauty Salons | 13 | 1.3% |
| Farm | 12 | 1.2% |
| Gas Stations | 12 | 1.2% |
Mahaska County Business Listings
| Business | Category | City |
|---|---|---|
| Boyle & Henderson | Accountant | Oskaloosa |
| Oskaloosa Recreation Trail | Active Life | Oskaloosa |
| Home Tools | Advertising Agency | Indianapolis |
| Agriland FS Oskaloosa | Agricultural Cooperatives | Oskaloosa |
| Imexco Inc | Agricultural Service | Oskaloosa |
| Pierson Seed Producers Inc | Agriculture | Oskaloosa |
| Edgren Airport | Airport | Oskaloosa |
| Longhorn Saloon | American Restaurants | Barnes City |
| Mahaska County Ikes Archery | Amusement Park | Oskaloosa |
| Heather Cadwell, CRNA | Anesthesiologist | Oskaloosa |
| Download Mahaska County business listings | ||
Mahaska County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Mahaska County Basemaps
Mahaska 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 Mahaska County Data Package
This page shows a preview of what's included in the Mahaska 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 Mahaska County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.