Rock Island County GIS Maps
Rock Island County, Illinois, has 144,672 residents and covers 427.4 square miles. The population declined 1.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Rock Island County is 17161.
Moline is the county's largest population center. Rock Island County also includes 17 zip codes, 8 public school districts and 40 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.
Rock Island County Trends
- Population
- 144,672▾
- Median Home Value
- $144,700▴
- K-12 Enrollment
- 19,871▴
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.
Rock Island 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.
Rock Island County Population
Rock Island County had 144,672 residents in 2020. That was 1.9% lower than in 2010. Rock Island County had 4,702 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 338 people per square mile. Some of the county's most populated postal areas include Moline, Rock Island and East Moline.
Population Trend in Rock Island County IL
Rock Island County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Rock Island County Zip Codes
Rock Island County has 17 zip codes. Some of the county's most populated zip codes include Moline (61265), Rock Island (61201) and East Moline (61244). Moline is the largest zip by population, with about 44,342 residents or 31% of the county total. Together, the three largest zips account for about 73% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Rock Island County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 61265 | Moline | 44,342 | ▾ -1.7% |
| 61201 | Rock Island | 37,366 | ▾ -4.5% |
| 61244 | East Moline | 24,004 | ▾ -0.2% |
| 61264 | Milan | 10,157 | ▾ -3.7% |
| 61282 | Silvis | 8,278 | ▴ 6% |
| Download all zip code data | |||
Rock Island County Zip Code populations and trends per most recent census data.
Rock Island County Demographics
Rock Island County has a median age of 40.3, which makes the county a little older than Illinois overall. About 22.5% of residents are under 18, while 20.1% 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 29.9% of the population, which points to a solid working-age base. About 24.1% 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 Rock Island County IL
Median Age
40.3
Under 18
22.5%
Age 65+
20.1%
Bachelor's+
24.1%
Rock Island County School Districts
Rock Island County is served by 8 public school districts with 19,871 students enrolled in 2024. The largest districts on the county map are Moline-Coal Valley 40, Rock Island-Milan 41 and Sherrard Community Unit 200. Those three districts account for about 75% 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 Rock Island County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Moline-Coal Valley School District 40 | 7,257 | 36.5% | ▴ 0% |
| Rock Island-Milan School District 41 | 6,292 | 31.7% | ▴ 1.3% |
| Sherrard Community Unit School District 200 | 1,305 | 6.6% | ▾ -2.9% |
| Mercer County School District 404 | 1,274 | 6.4% | ▴ 0.7% |
| Riverdale Community Unit School District 100 | 1,095 | 5.5% | ▴ 1% |
| Download all school district data | |||
Rock Island County school district enrollment and trends per most recent NCES reporting data.
Rock Island County Housing & Real Estate
Rock Island County has a median home value of $144,700 and a median gross rent of $863. About 69% 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 $157,450 and homes spent about 52 days on the market.
Rock Island County Housing Mix
Rock Island County housing mix: owner, renter and vacant units.
Rock Island County Housing Trends
Rock Island County median home value and rent trend (last 5 years).
Businesses in Rock Island County, IL
Rock Island County has 5,863 business listings across 726 categories. The largest categories in Rock Island County business listings are Churches & Religious Organizations (162, 2.8%), Medical Offices (97, 1.7%), and Auto Repair (92, 1.6%). The full Rock Island County business listings dataset includes names, categories, addresses and contact details where available. Rock Island County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Rock Island County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 162 | 2.8% |
| Medical Offices | 97 | 1.7% |
| Auto Repair | 92 | 1.6% |
| Parks & Recreation | 83 | 1.4% |
| Gas Stations | 83 | 1.4% |
| ATMs | 80 | 1.4% |
| Contractors | 75 | 1.3% |
| Landmark And Historical Building | 68 | 1.2% |
| Insurance Agencies | 68 | 1.2% |
| Beauty Salons | 68 | 1.2% |
Rock Island County Business Listings
| Business | Category | City |
|---|---|---|
| Top of the World Ranch | Abuse And Addiction Treatment | Milan |
| Century Woods Apartments | Accommodation | Rock Island |
| Mohr Accounting, Inc. | Accountant | Moline |
| Tug Fest - Illinois | Active Life | Port Byron |
| Healing Lotus Acupuncture | Acupuncture | Moline |
| Drug Rehab East Moline | Addiction Rehabilitation Center | East Moline |
| Black Hawk College Adult Learning Center | Adult Education | Rock Island |
| Esperanza Legal Assistance Center | Adult Store | Moline |
| Silver Oaks Communications | Advertising Agency | Moline |
| D’Savor House | African Restaurant | East Moline |
| Download Rock Island County business listings | ||
Rock Island County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Rock Island County Basemaps
Rock Island 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 Rock Island County Data Package
This page shows a preview of what's included in the Rock Island 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 Rock Island County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.