Johnson County GIS Maps
Johnson County, Iowa, has 152,854 residents across 74,391 parcels and covers 613 square miles. The population grew 16.8% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Johnson County is 19103.
Iowa City is the county's largest population center. Johnson County also includes 13 zip codes, 11 public school districts and 41 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.
Johnson County Trends
- Population
- 152,854▴
- Median Home Value
- $293,100▴
- K-12 Enrollment
- 31,835▴
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.
Johnson 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.
Johnson County Parcels
Johnson County has 74,391 mapped parcels. The median assessed value is $242,200. The median lot size is 0.77 acres. 9,696 parcels are 10 acres or larger. The records carry 55,872 distinct owner names. Owner names and assessed values are on nearly every parcel. Site addresses reach 83.4%. Lot sizes reach 51.9%. Browse the interactive Johnson County Parcel viewer here.
Johnson County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 74,391 | 100% |
| Owner name | 73,572 | 98.9% |
| Owner mailing address | 0 | 0% |
| Site address | 62,040 | 83.4% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 73,539 | 98.9% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 38,610 | 51.9% |
| Parcel boundary | 74,391 | 100% |
| Download all Johnson County parcels. | ||
Field coverage measured across all Johnson County parcel records.
Johnson County Population
Johnson County had 152,854 residents in 2020. That was 16.8% higher than in 2010. Johnson County added 41,848 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 249 people per square mile. Some of the county's most populated postal areas include Iowa City, Coralville and Coralville.
Population Trend in Johnson County IA
Johnson County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Johnson County Zip Codes
Johnson County has 13 zip codes. Some of the county's most populated zip codes include Iowa City (52240), Coralville (52246) and Coralville (52241). Iowa City is the largest zip by population, with about 34,224 residents or 22% of the county total. Together, the three largest zips account for about 52% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Johnson County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 52240 | Iowa City | 34,224 | ▴ 6.2% |
| 52246 | Coralville | 22,829 | ▴ 8.1% |
| 52241 | Coralville | 22,319 | ▴ 18% |
| 52317 | North Liberty | 22,096 | ▴ 49.5% |
| 52245 | Iowa City | 21,874 | ▾ -3.1% |
| Download all zip code data | |||
Johnson County Zip Code populations and trends per most recent census data.
Johnson County Demographics
Johnson County has a median age of 30.8, which makes the county a little younger than Iowa overall. About 19.5% of residents are under 18, while 12.9% 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 32.2% of the population, which points to a solid working-age base. About 54.6% of adults have a bachelor's degree or higher, above the statewide figure of 30.9%. The county is majority White by population, with Hispanic, Asian, Black and multiracial residents making up a meaningful share of the local mix.
Key Demographics for Johnson County IA
Median Age
30.8
Under 18
19.5%
Age 65+
12.9%
Bachelor's+
54.6%
Johnson County School Districts
Johnson County is served by 11 public school districts with 31,835 students enrolled in 2024. The largest districts on the county map are Iowa City Community, College Community and Clear Creek-Amana Community. Those three districts account for about 75% 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 Johnson County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Iowa City Community School District | 14,960 | 47% | ▴ 1.7% |
| College Community School District | 5,792 | 18.2% | ▴ 1.5% |
| Clear Creek-Amana Community School District | 3,156 | 9.9% | ▴ 2.1% |
| Solon Community School District | 1,477 | 4.6% | ▾ -3% |
| Mid-Prairie Community School District | 1,393 | 4.4% | ▾ -1.8% |
| Download all school district data | |||
Johnson County school district enrollment and trends per most recent NCES reporting data.
Johnson County Housing & Real Estate
Johnson County has a median home value of $293,100 and a median gross rent of $1,104. About 59% 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 above the state average. In March 2026, the median listing price was $354,923 and homes spent about 51 days on the market.
Johnson County Housing Mix
Johnson County housing mix: owner, renter and vacant units.
Johnson County Housing Trends
Johnson County median home value and rent trend (last 5 years).
Businesses in Johnson County, IA
Johnson County has 6,283 business listings across 780 categories. The largest categories in Johnson County business listings are Churches & Religious Organizations (116, 1.8%), Real Estate Agents (112, 1.8%), and Parks & Recreation (104, 1.7%). The full Johnson County business listings dataset includes names, categories, addresses and contact details where available. Johnson County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Johnson County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 116 | 1.8% |
| Real Estate Agents | 112 | 1.8% |
| Parks & Recreation | 104 | 1.7% |
| Community & Nonprofits | 96 | 1.5% |
| College University | 94 | 1.5% |
| Gyms & Fitness | 87 | 1.4% |
| Contractors | 85 | 1.4% |
| Hair Salons | 82 | 1.3% |
| Landmark And Historical Building | 80 | 1.3% |
| Coffee Shops | 69 | 1.1% |
Johnson County Business Listings
| Business | Category | City |
|---|---|---|
| Community Neurorehab | Abuse And Addiction Treatment | Coralville |
| Iowa Hawk Shop | Academic Bookstore | Iowa City |
| The Banks Student Living | Accommodation | Coralville |
| Kenneth J. Haldeman | Accountant | Iowa City |
| Topgolf Swing Suite | Active Life | Iowa City |
| Acupuncture of Iowa | Acupuncture | Iowa City |
| Addiction Treatment Iowa City | Addiction Rehabilitation Center | Iowa City |
| Romantix | Adult Entertainment | Iowa City |
| PC Media | Advertising Agency | Iowa City |
| I Love Fufu | African Restaurant | Iowa City |
| Download Johnson County business listings | ||
Johnson County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Johnson County Basemaps
Johnson 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 Johnson County Data Package
This page shows a preview of what's included in the Johnson 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 Johnson County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.