Winneshiek County GIS Maps
Winneshiek County, Iowa, has 20,070 residents and covers 689.8 square miles. The population declined 4.7% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Winneshiek County is 19191.
Decorah is the county's largest population center. Winneshiek County also includes 7 zip codes, 6 public school districts and 37 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.
Winneshiek County Trends
- Population
- 20,070▾
- Median Home Value
- $239,000▴
- K-12 Enrollment
- 5,329▾
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.
Winneshiek 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.
Winneshiek County Population
Winneshiek County had 20,070 residents in 2020. That was 4.7% lower than in 2010. Winneshiek County had 1,240 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 29 people per square mile. Some of the county's most populated postal areas include Decorah, Calmar and Ossian.
Population Trend in Winneshiek County IA
Winneshiek County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Winneshiek County Zip Codes
Winneshiek County has 7 zip codes. Some of the county's most populated zip codes include Decorah (52101), Calmar (52132) and Ossian (52161). Decorah is the largest zip by population, with about 13,186 residents or 66% 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 Winneshiek County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 52101 | Decorah | 13,186 | ▾ -4.9% |
| 52132 | Calmar | 1,832 | ▾ -5.5% |
| 52161 | Ossian | 1,409 | ▾ -6.4% |
| 52144 | Fort Atkinson | 1,186 | ▾ -5.9% |
| 52165 | Ridgeway | 876 | ▾ -12.7% |
| Download all zip code data | |||
Winneshiek County Zip Code populations and trends per most recent census data.
Winneshiek County Demographics
Winneshiek County has a median age of 42.2, which makes the county a little older than Iowa overall. About 19% of residents are under 18, while 22.6% 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 24.3% of the population, which points to a solid working-age base. About 31.5% 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 Winneshiek County IA
Median Age
42.2
Under 18
19%
Age 65+
22.6%
Bachelor's+
31.5%
Winneshiek County School Districts
Winneshiek County is served by 6 public school districts with 5,329 students enrolled in 2024. The largest districts on the county map are Decorah Community, Allamakee Community and Howard-Winneshiek Community. Those three districts account for about 69% 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 Winneshiek County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Decorah Community School District | 1,522 | 28.6% | ▾ -2.9% |
| Allamakee Community School District | 1,137 | 21.3% | ▾ -1.2% |
| Howard-Winneshiek Community School District | 1,021 | 19.2% | ▾ -1.2% |
| Postville Community School District | 737 | 13.8% | ▾ -0.3% |
| South Winneshiek Community School District | 529 | 9.9% | ▾ -0.6% |
| Download all school district data | |||
Winneshiek County school district enrollment and trends per most recent NCES reporting data.
Winneshiek County Housing & Real Estate
Winneshiek County has a median home value of $239,000 and a median gross rent of $800. About 76% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Iowa median, while rents come in below the state average. In March 2026, the median listing price was $299,750 and homes spent about 56 days on the market.
Winneshiek County Housing Mix
Winneshiek County housing mix: owner, renter and vacant units.
Winneshiek County Housing Trends
Winneshiek County median home value and rent trend (last 5 years).
Businesses in Winneshiek County, IA
Winneshiek County has 1,133 business listings across 361 categories. The largest categories in Winneshiek County business listings are Churches & Religious Organizations (38, 3.4%), Parks & Recreation (30, 2.6%), and Community & Nonprofits (20, 1.8%). The full Winneshiek County business listings dataset includes names, categories, addresses and contact details where available. Winneshiek County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Winneshiek County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 38 | 3.4% |
| Parks & Recreation | 30 | 2.6% |
| Community & Nonprofits | 20 | 1.8% |
| Contractors | 19 | 1.7% |
| Chiropractors | 15 | 1.3% |
| Convenience Stores | 15 | 1.3% |
| Auto Repair | 14 | 1.2% |
| Campgrounds & RV Parks | 14 | 1.2% |
| Car Dealerships | 14 | 1.2% |
| Insurance Agencies | 14 | 1.2% |
Winneshiek County Business Listings
| Business | Category | City |
|---|---|---|
| Luther College Farwell Hall | Accommodation | Decorah |
| By The Books | Accountant | Ossian |
| Sweet Memories Stables | Active Life | Decorah |
| Wildcrafted Acupuncture & Herbs, LLC | Acupuncture | Decorah |
| Farmers Union Cooperative | Agricultural Cooperatives | Ossian |
| Brynsaas Sales and Services | Agricultural Service | Decorah |
| Winneshiek County Farm Bureau | Agriculture | Decorah |
| Decorah Municipal Airport | Airport | Decorah |
| Rubaiyat Restaurant | American Restaurants | Decorah |
| Good Dog Center | Amusement Park | Decorah |
| Download Winneshiek County business listings | ||
Winneshiek County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Winneshiek County Basemaps
Winneshiek 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 Winneshiek County Data Package
This page shows a preview of what's included in the Winneshiek 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 Winneshiek County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.