Johnson County GIS Maps
Johnson County, Illinois, has 13,308 residents and covers 343.9 square miles. The population grew 5.8% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Johnson County is 17087.
Vienna is the county's largest population center. Johnson County also includes 7 zip codes, 2 public school districts and 30 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.
Johnson County Trends
- Population
- 13,308▴
- Median Home Value
- $148,200▴
- K-12 Enrollment
- 961▾
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 Population
Johnson County had 13,308 residents in 2020. That was 5.8% higher than in 2010. Johnson County added 430 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 39 people per square mile. Some of the county's most populated postal areas include Vienna, Goreville and Ozark.
Population Trend in Johnson County IL
Johnson County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Johnson County Zip Codes
Johnson County has 7 zip codes. Some of the county's most populated zip codes include Vienna (62995), Goreville (62939) and Ozark (62972). Vienna is the largest zip by population, with about 6,077 residents or 46% of the county total. Together, the three largest zips account for about 79% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Johnson County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 62995 | Vienna | 6,077 | ▴ 15% |
| 62939 | Goreville | 3,129 | ▴ 0.3% |
| 62972 | Ozark | 1,265 | ▴ 5% |
| 62912 | Buncombe | 1,226 | ▴ 4% |
| 62943 | Vienna | 653 | ▾ -8.7% |
| 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 42.7, which makes the county a little older than Illinois overall. About 17.8% of residents are under 18, while 20.4% 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 31.3% of the population, which points to a solid working-age base. About 18.8% of adults have a bachelor's degree or higher, above the statewide figure of 37.2%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Johnson County IL
Median Age
42.7
Under 18
17.8%
Age 65+
20.4%
Bachelor's+
18.8%
Johnson County School Districts
Johnson County is served by 2 public school districts with 961 students enrolled in 2024. Several larger districts account for a substantial share of students across the county map area. Those three districts account for about 100% 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 Johnson County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Goreville Community Unit School District 1 | 630 | 65.6% | ▾ -2.9% |
| Century Community Unit School District 100 | 331 | 34.4% | ▴ 0.6% |
| 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 $148,200 and a median gross rent of $634. About 85% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Illinois median, while rents come in below the state average. In March 2026, the median listing price was $257,000 and homes spent about 63 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, IL
Johnson County has 416 business listings across 180 categories. The largest categories in Johnson County business listings are Churches & Religious Organizations (23, 5.5%), Auto Repair (10, 2.4%), and Gas Stations (10, 2.4%). 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, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 23 | 5.5% |
| Auto Repair | 10 | 2.4% |
| Gas Stations | 10 | 2.4% |
| Post Offices | 8 | 1.9% |
| Baptist Church | 8 | 1.9% |
| Community & Nonprofits | 7 | 1.7% |
| Parks & Recreation | 7 | 1.7% |
| Public And Government Association | 7 | 1.7% |
| Campgrounds & RV Parks | 7 | 1.7% |
| Discount Store | 6 | 1.4% |
Johnson County Business Listings
| Business | Category | City |
|---|---|---|
| Cedar Lake Campground - Shawnee National Forest | Active Life | Vienna |
| Rocky Road Farm Sales | Agricultural Service | Vienna |
| Yates Construction | Altering And Remodeling Contractor | Ozark |
| Johnson County Ambulance Services | Ambulance And Ems Services | Anna |
| Delaney's on Broadway | American Restaurants | Goreville |
| Milkmaid Creations and Antiques | Antique Store | Vienna |
| Art Gallery Off the Square | Art Gallery | Vienna |
| Northern Lights Entertainment | Arts And Entertainment | Vienna |
| The Exchange Network | ATMs | Vienna |
| Vienna High School Football Field | Attractions And Activities | Vienna |
| 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 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.