Winnebago County GIS Maps
Winnebago County, Illinois, has 285,350 residents and covers 513.2 square miles. The population declined 3.4% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Winnebago County is 17201.
Rockford is the county's largest population center. Winnebago County also includes 20 zip codes, 8 public school districts and 33 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.
Winnebago County Trends
- Population
- 285,350▾
- Median Home Value
- $155,100▴
- K-12 Enrollment
- 40,031▴
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.
Winnebago 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.
Winnebago County Population
Winnebago County had 285,350 residents in 2020. That was 3.4% lower than in 2010. Winnebago County added 6,932 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 556 people per square mile. Some of the county's most populated postal areas include Rockford, Rockford and Rockford.
Population Trend in Winnebago County IL
Winnebago County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Winnebago County Zip Codes
Winnebago County has 20 zip codes. Some of the county's most populated zip codes include Rockford (61107), Rockford (61108) and Rockford (61109). Rockford is the largest zip by population, with about 30,722 residents or 11% of the county total. Together, the three largest zips account for about 31% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Winnebago County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 61107 | Rockford | 30,722 | ▴ 0.9% |
| 61108 | Rockford | 29,660 | ▴ 3.9% |
| 61109 | Rockford | 26,958 | ▾ -4.9% |
| 61103 | Rockford | 23,294 | ▾ -5.2% |
| 61111 | Loves Park | 23,028 | ▾ -2% |
| Download all zip code data | |||
Winnebago County Zip Code populations and trends per most recent census data.
Winnebago County Demographics
Winnebago County has a median age of 39.7, which makes the county a little older than Illinois overall. About 23.6% of residents are under 18, while 18.2% 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 30.3% of the population, which points to a solid working-age base. About 24.6% 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 Winnebago County IL
Median Age
39.7
Under 18
23.6%
Age 65+
18.2%
Bachelor's+
24.6%
Winnebago County School Districts
Winnebago County is served by 8 public school districts with 40,031 students enrolled in 2024. The largest districts on the county map are Rockford 205, Harlem Unit 122 and Meridian Community Unit 223. Those three districts account for about 90% 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 Winnebago County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Rockford School District 205 | 28,467 | 71.1% | ▴ 2.9% |
| Harlem Unit School District 122 | 6,108 | 15.3% | ▾ -2.3% |
| Meridian Community Unit School District 223 | 1,469 | 3.7% | ▾ -1.7% |
| Winnebago Community Unit School District 323 | 1,267 | 3.2% | ▾ -0.1% |
| County of Winnebago SD 320 | 895 | 2.2% | ▾ -3.8% |
| Download all school district data | |||
Winnebago County school district enrollment and trends per most recent NCES reporting data.
Winnebago County Housing & Real Estate
Winnebago County has a median home value of $155,100 and a median gross rent of $986. About 65% 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 $212,450 and homes spent about 34 days on the market.
Winnebago County Housing Mix
Winnebago County housing mix: owner, renter and vacant units.
Winnebago County Housing Trends
Winnebago County median home value and rent trend (last 5 years).
Businesses in Winnebago County, IL
Winnebago County has 11,707 business listings across 872 categories. The largest categories in Winnebago County business listings are Churches & Religious Organizations (275, 2.3%), Auto Repair (224, 1.9%), and Insurance Agencies (184, 1.6%). The full Winnebago County business listings dataset includes names, categories, addresses and contact details where available. Winnebago County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Winnebago County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 275 | 2.3% |
| Auto Repair | 224 | 1.9% |
| Insurance Agencies | 184 | 1.6% |
| Gas Stations | 183 | 1.6% |
| Beauty Salons | 176 | 1.5% |
| Contractors | 174 | 1.5% |
| Parks & Recreation | 163 | 1.4% |
| Real Estate Agents | 149 | 1.3% |
| Medical Offices | 144 | 1.2% |
| ATMs | 137 | 1.2% |
Winnebago County Business Listings
| Business | Category | City |
|---|---|---|
| PA Peterson at the Citadel | Abuse And Addiction Treatment | Rockford |
| Victory Homes Co-Op | Accommodation | Rockford |
| Price Lawson | Accountant | Roscoe |
| Sinnissippi Golf Course | Active Life | Rockford |
| Theresa Johnson Licensed Acupuncturist and Herbalist | Acupuncture | Roscoe |
| Rasmussen College - Rockford Campus | Adult Education | Rockford |
| Secrets of Rockford | Adult Entertainment | Rockford |
| LuccaAM | Advertising Agency | Rockford |
| Conserv FS | Agricultural Cooperatives | Rockford |
| Meridian Implement | Agricultural Service | Rockford |
| Download Winnebago County business listings | ||
Winnebago County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Winnebago County Basemaps
Winnebago 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 Winnebago County Data Package
This page shows a preview of what's included in the Winnebago 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 Winnebago County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.