Clinton County GIS Maps
Clinton County, Illinois, has 36,899 residents and covers 474 square miles. The population declined 2.3% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Clinton County is 17027.
Breese is the county's largest population center. Clinton County also includes 11 zip codes, 4 public school districts and 31 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.
Clinton County Trends
- Population
- 36,899▾
- Median Home Value
- $180,500▴
- K-12 Enrollment
- 2,844▾
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.
Clinton 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.
Clinton County Population
Clinton County had 36,899 residents in 2020. That was 2.3% lower than in 2010. Clinton County added 1,364 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 78 people per square mile. Some of the county's most populated postal areas include Carlyle, Breese and Trenton.
Population Trend in Clinton County IL
Clinton County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Clinton County Zip Codes
Clinton County has 11 zip codes. Some of the county's most populated zip codes include Carlyle (62231), Breese (62230) and Trenton (62293). Carlyle is the largest zip by population, with about 7,171 residents or 19% of the county total. Together, the three largest zips account for about 49% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Clinton County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 62231 | Carlyle | 7,171 | ▾ -5.5% |
| 62230 | Breese | 6,414 | ▴ 3.6% |
| 62293 | Trenton | 4,562 | ▾ -3.9% |
| 62265 | New Baden | 4,446 | ▴ 2.1% |
| 62216 | Aviston | 3,019 | ▴ 19.5% |
| Download all zip code data | |||
Clinton County Zip Code populations and trends per most recent census data.
Clinton County Demographics
Clinton County has a median age of 41.4, which makes the county a little older than Illinois overall. About 21.6% of residents are under 18, while 18.1% 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% of the population, which points to a solid working-age base. About 24.4% 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 Clinton County IL
Median Age
41.4
Under 18
21.6%
Age 65+
18.1%
Bachelor's+
24.4%
Clinton County School Districts
Clinton County is served by 4 public school districts with 2,844 students enrolled in 2024. The largest districts on the county map are Wesclin Community Unit 3, Carlyle Community Unit 1 and Sandoval Community Unit 501. Those three districts account for about 93% 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 Clinton County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Wesclin Community Unit School District 3 | 1,288 | 45.3% | ▾ -2.4% |
| Carlyle Community Unit School District 1 | 926 | 32.6% | ▴ 1.8% |
| Sandoval Community Unit School District 501 | 429 | 15.1% | ▾ -0.5% |
| Patoka Community Unit School District 100 | 201 | 7.1% | ▾ -10.7% |
| Download all school district data | |||
Clinton County school district enrollment and trends per most recent NCES reporting data.
Clinton County Housing & Real Estate
Clinton County has a median home value of $180,500 and a median gross rent of $934. About 79% 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 $226,800 and homes spent about 57 days on the market.
Clinton County Housing Mix
Clinton County housing mix: owner, renter and vacant units.
Clinton County Housing Trends
Clinton County median home value and rent trend (last 5 years).
Businesses in Clinton County, IL
Clinton County has 1,483 business listings across 379 categories. The largest categories in Clinton County business listings are Churches & Religious Organizations (32, 2.2%), Auto Repair (29, 2.0%), and Insurance Agencies (28, 1.9%). The full Clinton County business listings dataset includes names, categories, addresses and contact details where available. Clinton County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Clinton County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 32 | 2.2% |
| Auto Repair | 29 | 2.0% |
| Insurance Agencies | 28 | 1.9% |
| Elementary School | 25 | 1.7% |
| Beauty Salons | 24 | 1.6% |
| Gas Stations | 22 | 1.5% |
| Parks & Recreation | 20 | 1.3% |
| Bars & Nightlife | 20 | 1.3% |
| Pizza Restaurants | 20 | 1.3% |
| Convenience Stores | 19 | 1.3% |
Clinton County Business Listings
| Business | Category | City |
|---|---|---|
| Germantown Community Home | Accommodation | Germantown |
| Glass & Shuffett | Accountant | Centralia |
| Dam West at Carlyle Lake | Active Life | Carlyle |
| Clinton County Farm Bureau | Agricultural Cooperatives | Breese |
| The Equity at St. Rose | Agricultural Service | Breese |
| Haas Seed House | Agriculture | Albers |
| Twenhafel Field | Airport | Carlyle |
| MedStar Carlyle | Ambulance And Ems Services | Carlyle |
| Valbo's Restaurant | American Restaurants | Germantown |
| Fish Hatchery Playground | Amusement Park | Carlyle |
| Download Clinton County business listings | ||
Clinton County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Clinton County Basemaps
Clinton 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 Clinton County Data Package
This page shows a preview of what's included in the Clinton 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 Clinton County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.