Randolph County GIS Maps
Randolph County, Illinois, has 30,163 residents and covers 575.3 square miles. The population declined 9.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Randolph County is 17157.
Chester is the county's largest population center. Randolph County also includes 11 zip codes, 6 public school districts and 36 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.
Randolph County Trends
- Population
- 30,163▾
- Median Home Value
- $134,100▴
- K-12 Enrollment
- 4,641▾
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.
Randolph 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.
Randolph County Population
Randolph County had 30,163 residents in 2020. That was 9.9% lower than in 2010. Randolph County had 3,730 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 52 people per square mile. Some of the county's most populated postal areas include Chester, Sparta and Steeleville.
Population Trend in Randolph County IL
Randolph County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Randolph County Zip Codes
Randolph County has 11 zip codes. Some of the county's most populated zip codes include Chester (62233), Sparta (62286) and Steeleville (62288). Chester is the largest zip by population, with about 8,187 residents or 27% of the county total. Together, the three largest zips account for about 55% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Randolph County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 62233 | Chester | 8,187 | ▾ -18.4% |
| 62286 | Sparta | 5,719 | ▾ -4.8% |
| 62288 | Steeleville | 2,708 | ▾ -7.2% |
| 62272 | Steeleville | 1,472 | ▾ -12.1% |
| 62242 | Evansville | 1,239 | ▾ -18.8% |
| Download all zip code data | |||
Randolph County Zip Code populations and trends per most recent census data.
Randolph County Demographics
Randolph County has a median age of 43, which makes the county a little older than Illinois overall. About 20.4% of residents are under 18, while 20.8% 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 30.6% of the population, which points to a solid working-age base. About 14.2% 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 Randolph County IL
Median Age
43
Under 18
20.4%
Age 65+
20.8%
Bachelor's+
14.2%
Randolph County School Districts
Randolph County is served by 6 public school districts with 4,641 students enrolled in 2024. The largest districts on the county map are Sparta Community Unit 140, Red Bud Community Unit 132 and Chester Community Unit 139. Those three districts account for about 67% 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 Randolph County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Sparta Community Unit School District 140 | 1,153 | 24.8% | ▾ -3.4% |
| Red Bud Community Unit School District 132 | 978 | 21.1% | ▾ -4.9% |
| Chester Community Unit School District 139 | 975 | 21% | ▴ 0.7% |
| Trico Community Unit School District 176 | 879 | 18.9% | ▴ 0.3% |
| Steeleville Community Unit School District 138 | 471 | 10.1% | ▴ 12.1% |
| Download all school district data | |||
Randolph County school district enrollment and trends per most recent NCES reporting data.
Randolph County Housing & Real Estate
Randolph County has a median home value of $134,100 and a median gross rent of $760. About 77% 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 $154,950 and homes spent about 63 days on the market.
Randolph County Housing Mix
Randolph County housing mix: owner, renter and vacant units.
Randolph County Housing Trends
Randolph County median home value and rent trend (last 5 years).
Businesses in Randolph County, IL
Randolph County has 1,288 business listings across 348 categories. The largest categories in Randolph County business listings are Churches & Religious Organizations (64, 5.0%), Auto Repair (27, 2.1%), and Landmark And Historical Building (27, 2.1%). The full Randolph County business listings dataset includes names, categories, addresses and contact details where available. Randolph County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Randolph County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 64 | 5.0% |
| Auto Repair | 27 | 2.1% |
| Landmark And Historical Building | 27 | 2.1% |
| Insurance Agencies | 23 | 1.8% |
| Bars & Nightlife | 19 | 1.5% |
| Police Department | 18 | 1.4% |
| Banks & Credit Unions | 17 | 1.3% |
| Convenience Stores | 17 | 1.3% |
| Community & Nonprofits | 16 | 1.2% |
| Post Offices | 15 | 1.2% |
Randolph County Business Listings
| Business | Category | City |
|---|---|---|
| Steeleville Manor | Accommodation | Steeleville |
| Henrys Tax Service | Accountant | Sparta |
| Health Options | Acupuncture | Sparta |
| Gateway FS Inc | Agricultural Cooperatives | Prairie du Rocher |
| Midwest Tractor Sales | Agricultural Service | Sparta |
| Crop Production Services | Agriculture | Marissa |
| Korando Airport | Airport | Sparta |
| MedStar Ambulance | Ambulance And Ems Services | Sparta |
| Lisa's Market Street Grille | American Restaurants | Prairie du Rocher |
| Load ‘N Go Training | Amusement Park | Sparta |
| Download Randolph County business listings | ||
Randolph County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Randolph County Basemaps
Randolph 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 Randolph County Data Package
This page shows a preview of what's included in the Randolph 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.
One-time · instant download · 30-day refund guarantee · See full package details
Preview a Live Package Demo
See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Illinois — explore the full structure before you buy.
No email or download required. Opens in a preview window on this page.
Nearby Counties
Browse county data pages for the counties that border Randolph County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.