Warren County GIS Maps
Warren County, Illinois, has 16,835 residents and covers 542.4 square miles. The population declined 4.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Warren County is 17187.
Monmouth is the county's largest population center. Warren County also includes 8 zip codes, 6 public school districts and 32 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.
Warren County Trends
- Population
- 16,835▾
- Median Home Value
- $101,300▴
- K-12 Enrollment
- 8,710▾
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.
Warren 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.
Warren County Population
Warren County had 16,835 residents in 2020. That was 4.9% lower than in 2010. Warren County had 1,900 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 31 people per square mile. Some of the county's most populated postal areas include Monmouth, Roseville and Kirkwood.
Population Trend in Warren County IL
Warren County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Warren County Zip Codes
Warren County has 8 zip codes. Some of the county's most populated zip codes include Monmouth (61462), Roseville (61473) and Kirkwood (61447). Monmouth is the largest zip by population, with about 10,980 residents or 65% of the county total. Together, the three largest zips account for about 80% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Warren County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 61462 | Monmouth | 10,980 | ▾ -5.7% |
| 61473 | Roseville | 1,539 | ▾ -7.7% |
| 61447 | Kirkwood | 923 | ▾ -0.1% |
| 61453 | Little York | 609 | ▾ -22% |
| 61423 | Cameron | 596 | ▾ -12.6% |
| Download all zip code data | |||
Warren County Zip Code populations and trends per most recent census data.
Warren County Demographics
Warren County has a median age of 38.7, which is close to the Illinois average. About 22.2% of residents are under 18, while 19.6% 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 26.1% of the population, which points to a solid working-age base. About 22% of adults have a bachelor's degree or higher, above the statewide figure of 37.2%. 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 Warren County IL
Median Age
38.7
Under 18
22.2%
Age 65+
19.6%
Bachelor's+
22%
Warren County School Districts
Warren County is served by 6 public school districts with 8,710 students enrolled in 2024. The largest districts on the county map are Galesburg Community Unit 205, Monmouth-Roseville Community Unit 238 and United Community 304. Those three districts account for about 74% 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 Warren County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Galesburg Community Unit School District 205 | 3,863 | 44.4% | ▾ -1.1% |
| Monmouth-Roseville Community Unit School District 238 | 1,579 | 18.1% | ▾ -1.3% |
| United Community School District 304 | 1,008 | 11.6% | ▴ 6.2% |
| Abingdon-Avon Community Unit School District 276 | 906 | 10.4% | ▴ 0.6% |
| West Central Community Unit School District 235 | 752 | 8.6% | ▾ -1.1% |
| Download all school district data | |||
Warren County school district enrollment and trends per most recent NCES reporting data.
Warren County Housing & Real Estate
Warren County has a median home value of $101,300 and a median gross rent of $694. About 78% 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 $135,000 and homes spent about 92 days on the market.
Warren County Housing Mix
Warren County housing mix: owner, renter and vacant units.
Warren County Housing Trends
Warren County median home value and rent trend (last 5 years).
Businesses in Warren County, IL
Warren County has 701 business listings across 271 categories. The largest categories in Warren County business listings are Churches & Religious Organizations (29, 4.1%), Public And Government Association (14, 2.0%), and Convenience Stores (11, 1.6%). The full Warren County business listings dataset includes names, categories, addresses and contact details where available. Warren County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Warren County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 29 | 4.1% |
| Public And Government Association | 14 | 2.0% |
| Convenience Stores | 11 | 1.6% |
| Insurance Agencies | 10 | 1.4% |
| College University | 10 | 1.4% |
| Bars & Nightlife | 10 | 1.4% |
| Post Offices | 10 | 1.4% |
| Contractors | 10 | 1.4% |
| Farm | 9 | 1.3% |
| Funeral Services & Cemeteries | 9 | 1.3% |
Warren County Business Listings
| Business | Category | City |
|---|---|---|
| Monmouth College Bookstore | Academic Bookstore | Monmouth |
| Bowers Residence Hall | Accommodation | Monmouth |
| West Central CPA | Accountant | Monmouth |
| Little Swan Lake | Active Life | Avon |
| Clear Profits Digital Marketing | Advertising Agency | Monmouth |
| Taste of Africa | African Restaurant | Monmouth |
| Warren-Henderson Farm Bureau | Agricultural Cooperatives | Monmouth |
| McGrew Feedlot Equipment | Agricultural Service | Avon |
| Monmouth Airport | Airport | Monmouth |
| American Hemp Research | Alternative Medicine | Roseville |
| Download Warren County business listings | ||
Warren County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Warren County Basemaps
Warren 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 Warren County Data Package
This page shows a preview of what's included in the Warren 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 Warren County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.