Monona County GIS Maps
Monona County, Iowa, has 8,751 residents across 20,341 parcels and covers 694.1 square miles. The population declined 5.3% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Monona County is 19133.
Onawa is the county's largest population center. Monona County also includes 9 zip codes, 8 public school districts and 39 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.
Monona County Trends
- Population
- 8,751▾
- Median Home Value
- $122,600▴
- K-12 Enrollment
- 3,410▾
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.
Monona 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.
Monona County Parcels
Monona County has 20,341 mapped parcels covering 434,695 acres. The median assessed value is $77,226. The median lot size is 24.12 acres. 12,042 parcels are 10 acres or larger. The records carry 5,401 distinct owner names. Owner names and lot sizes are on nearly every parcel. Assessed values reach 97.6%. Browse the interactive Monona County Parcel viewer here.
Monona County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 20,341 | 100% |
| Owner name | 20,285 | 99.7% |
| Owner mailing address | 0 | 0% |
| Site address | 6,440 | 31.7% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 19,845 | 97.6% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 19,965 | 98.2% |
| Parcel boundary | 20,341 | 100% |
| Download all Monona County parcels. | ||
Field coverage measured across all Monona County parcel records.
Monona County Population
Monona County had 8,751 residents in 2020. That was 5.3% lower than in 2010. Monona County had 1,269 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 13 people per square mile. Some of the county's most populated postal areas include Onawa, Mapleton and Whiting.
Population Trend in Monona County IA
Monona County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Monona County Zip Codes
Monona County has 9 zip codes. Some of the county's most populated zip codes include Onawa (51040), Mapleton (51034) and Whiting (51063). Onawa is the largest zip by population, with about 3,537 residents or 40% of the county total. Together, the three largest zips account for about 72% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Monona County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 51040 | Onawa | 3,537 | ▾ -4.7% |
| 51034 | Mapleton | 1,698 | ▾ -6.7% |
| 51063 | Whiting | 1,032 | ▾ -6.2% |
| 51060 | Ute | 546 | ▾ -11.2% |
| 51558 | Soldier | 518 | ▾ -7.5% |
| Download all zip code data | |||
Monona County Zip Code populations and trends per most recent census data.
Monona County Demographics
Monona County has a median age of 44.7, which makes the county a little older than Iowa overall. About 22.4% of residents are under 18, while 23.8% 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 26.3% of the population, which points to a solid working-age base. About 18.7% 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 Monona County IA
Median Age
44.7
Under 18
22.4%
Age 65+
23.8%
Bachelor's+
18.7%
Monona County School Districts
Monona County is served by 8 public school districts with 3,410 students enrolled in 2024. The largest districts on the county map are West Monona Community, Maple Valley-Anthon Oto Community and Westwood Community. Those three districts account for about 54% 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 Monona County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| West Monona Community School District | 633 | 18.6% | ▾ -1.9% |
| Maple Valley-Anthon Oto Community School District | 602 | 17.7% | ▾ -2.6% |
| Westwood Community School District | 597 | 17.5% | ▾ -5.7% |
| Woodbine Community School District | 564 | 16.5% | ▾ -0.4% |
| Boyer Valley Community School District | 427 | 12.5% | — 0% |
| Download all school district data | |||
Monona County school district enrollment and trends per most recent NCES reporting data.
Monona County Housing & Real Estate
Monona County has a median home value of $122,600 and a median gross rent of $795. About 76% 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 $199,375 and homes spent about 102 days on the market.
Monona County Housing Mix
Monona County housing mix: owner, renter and vacant units.
Monona County Housing Trends
Monona County median home value and rent trend (last 5 years).
Businesses in Monona County, IA
Monona County has 450 business listings across 187 categories. The largest categories in Monona County business listings are Churches & Religious Organizations (21, 4.7%), Bars & Nightlife (13, 2.9%), and Parks & Recreation (12, 2.7%). The full Monona County business listings dataset includes names, categories, addresses and contact details where available. Monona County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Monona County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 21 | 4.7% |
| Bars & Nightlife | 13 | 2.9% |
| Parks & Recreation | 12 | 2.7% |
| Gas Stations | 9 | 2.0% |
| Convenience Stores | 8 | 1.8% |
| Insurance Agencies | 7 | 1.6% |
| Campgrounds & RV Parks | 7 | 1.6% |
| Hair Salons | 7 | 1.6% |
| Car Dealerships | 7 | 1.6% |
| Beauty Salons | 6 | 1.3% |
Monona County Business Listings
| Business | Category | City |
|---|---|---|
| Extended Stay Countryside | Accommodation | Onawa |
| Soil Solutions | Agricultural Service | Onawa |
| NEW Cooperative | Agriculture | Mapleton |
| Maynard Airport | Airport | Monona County |
| Charlie's Restaurant and Lounge | American Restaurants | Whiting |
| jamms antique mall | Antique Store | Onawa |
| The Hut Appliance and Home Goods Store | Appliance Store | Onawa |
| Simply Signs - Onawa, IA | Arts And Crafts | Onawa |
| Elmwood Care Center | Assisted Living Facility | Onawa |
| LibertyX Bitcoin ATM | ATMs | Mapleton |
| Download Monona County business listings | ||
Monona County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Monona County Basemaps
Monona 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 Monona County Data Package
This page shows a preview of what's included in the Monona 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 Monona County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.