Calhoun County GIS Maps
Calhoun County, Iowa, has 9,927 residents across 17,306 parcels and covers 569.9 square miles. The population grew 2.7% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Calhoun County is 19025.
Rockwell City is the county's largest population center. Calhoun County also includes 10 zip codes, 5 public school districts and 33 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.
Calhoun County Trends
- Population
- 9,927▴
- Median Home Value
- $114,400▴
- K-12 Enrollment
- 3,966▾
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.
Calhoun 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.
Calhoun County Parcels
Calhoun County has 17,306 mapped parcels covering 346,771 acres. Agricultural land accounts for 62.8% of parcels. Residential follows at 26.6% and commercial at 6.5%. The records carry 6,374 distinct owner names. Owner names are on nearly every parcel. Browse the interactive Calhoun County Parcel viewer here.
Calhoun County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 17,306 | 100% |
| Owner name | 17,306 | 100% |
| Owner mailing address | 0 | 0% |
| Site address | 6,151 | 35.5% |
| Land use code | 0 | 0% |
| Land use description | 17,306 | 100% |
| Assessed value | 0 | 0% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 0 | 0% |
| Parcel boundary | 17,306 | 100% |
| Download all Calhoun County parcels. | ||
Field coverage measured across all Calhoun County parcel records.
Calhoun County Population
Calhoun County had 9,927 residents in 2020. That was 2.7% higher than in 2010. Calhoun County had 1,188 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 17 people per square mile. Some of the county's most populated postal areas include Rockwell City, Manson and Lake City.
Population Trend in Calhoun County IA
Calhoun County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Calhoun County Zip Codes
Calhoun County has 10 zip codes. Some of the county's most populated zip codes include Rockwell City (50579), Manson (50563) and Lake City (51449). Rockwell City is the largest zip by population, with about 2,895 residents or 29% of the county total. Together, the three largest zips account for about 75% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Calhoun County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 50579 | Rockwell City | 2,895 | ▴ 20.4% |
| 50563 | Manson | 2,471 | ▾ -1.2% |
| 51449 | Lake City | 2,098 | ▾ -1.4% |
| 50575 | Pomeroy | 810 | ▾ -16.4% |
| 51453 | Lohrville | 631 | ▾ -9.2% |
| Download all zip code data | |||
Calhoun County Zip Code populations and trends per most recent census data.
Calhoun County Demographics
Calhoun County has a median age of 42.7, which makes the county a little older than Iowa overall. About 21.8% of residents are under 18, while 23.3% 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 21.5% 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 Calhoun County IA
Median Age
42.7
Under 18
21.8%
Age 65+
23.3%
Bachelor's+
21.5%
Calhoun County School Districts
Calhoun County is served by 5 public school districts with 3,966 students enrolled in 2024. The largest districts on the county map are Southeast Valley Community, South Central Calhoun Community and Manson Northwest Webster Community. Those three districts account for about 70% of public school enrollment in the map area. Total enrollment has grown modestly since 2017 across the districts shown on the county map.
Largest School Districts by Enrollment in Calhoun County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Southeast Valley Community School District | 1,077 | 27.2% | ▾ -2.1% |
| South Central Calhoun Community School District | 912 | 23% | ▾ -0.3% |
| Manson Northwest Webster Community School District | 776 | 19.6% | ▾ -2.1% |
| Pocahontas Area Community School District | 659 | 16.6% | ▾ -1.1% |
| Newell-Fonda Community School District | 542 | 13.7% | ▾ -2.5% |
| Download all school district data | |||
Calhoun County school district enrollment and trends per most recent NCES reporting data.
Calhoun County Housing & Real Estate
Calhoun County has a median home value of $114,400 and a median gross rent of $690. About 81% 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 $190,875 and homes spent about 96 days on the market.
Calhoun County Housing Mix
Calhoun County housing mix: owner, renter and vacant units.
Calhoun County Housing Trends
Calhoun County median home value and rent trend (last 5 years).
Businesses in Calhoun County, IA
Calhoun County has 416 business listings across 168 categories. The largest categories in Calhoun County business listings are Churches & Religious Organizations (17, 4.1%), Convenience Stores (13, 3.1%), and Public And Government Association (11, 2.6%). The full Calhoun County business listings dataset includes names, categories, addresses and contact details where available. Calhoun County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Calhoun County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 17 | 4.1% |
| Convenience Stores | 13 | 3.1% |
| Public And Government Association | 11 | 2.6% |
| Insurance Agencies | 10 | 2.4% |
| Auto Repair | 8 | 1.9% |
| Discount Store | 8 | 1.9% |
| Contractors | 8 | 1.9% |
| Libraries | 8 | 1.9% |
| Gas Stations | 7 | 1.7% |
| Flowers & Gifts | 7 | 1.7% |
Calhoun County Business Listings
| Business | Category | City |
|---|---|---|
| Northern Iowa Acupuncture Clinic | Acupuncture | Rockwell City |
| Landus | Agricultural Service | Auburn |
| US Consolidated Farm Services Agency | Agriculture | Rockwell City |
| Rockwell City Airport | Airport | Rockwell City |
| Calhoun County Emergency Medical Services | Ambulance And Ems Services | Rockwell City |
| Wlc Country Cuisine | American Restaurants | Rockwell City |
| Trash and Treasures | Antique Store | Rockwell City |
| Swanson Audio Video Appliance | Appliance Repair Service | Rockwell City |
| Bonnie Lass Creations | Arts And Crafts | Rockwell City |
| Jim Hirschberg's Sound Co. | Arts And Entertainment | Lohrville |
| Download Calhoun County business listings | ||
Calhoun County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Calhoun County Basemaps
Calhoun 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 Calhoun County Data Package
This page shows a preview of what's included in the Calhoun 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 Calhoun County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.