McHenry County GIS Maps
McHenry County, Illinois, has 310,229 residents and covers 603.4 square miles. The population grew 0.5% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for McHenry County is 17111.
Crystal Lake is the county's largest population center. McHenry County also includes 18 zip codes, 8 public school districts and 37 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.
McHenry County Trends
- Population
- 310,229▴
- Median Home Value
- $286,900▴
- K-12 Enrollment
- 51,959▾
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.
McHenry 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.
McHenry County Population
McHenry County had 310,229 residents in 2020. That was 0.5% higher than in 2010. McHenry County added 50,152 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 514 people per square mile. Some of the county's most populated postal areas include Crystal Lake, Woodstock and Algonquin.
Population Trend in McHenry County IL
McHenry County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
McHenry County Zip Codes
McHenry County has 18 zip codes. Some of the county's most populated zip codes include Crystal Lake (60014), Woodstock (60098) and Algonquin (60102). Crystal Lake is the largest zip by population, with about 48,275 residents or 16% of the county total. Together, the three largest zips account for about 37% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in McHenry County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 60014 | Crystal Lake | 48,275 | ▾ -0.6% |
| 60098 | Woodstock | 33,153 | ▴ 2.9% |
| 60102 | Algonquin | 31,959 | ▾ -0.7% |
| 60050 | Mchenry | 31,854 | ▴ 0.7% |
| 60142 | Huntley | 29,831 | ▴ 12.8% |
| Download all zip code data | |||
McHenry County Zip Code populations and trends per most recent census data.
McHenry County Demographics
McHenry County has a median age of 40.4, which makes the county a little older than Illinois overall. About 23% of residents are under 18, while 15.9% 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 31.1% of the population, which points to a solid working-age base. About 35.2% 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 McHenry County IL
Median Age
40.4
Under 18
23%
Age 65+
15.9%
Bachelor's+
35.2%
McHenry County School Districts
McHenry County is served by 8 public school districts with 51,959 students enrolled in 2024. The largest districts on the county map are Community Unit 300, Huntley Consolidated 158 and Barrington Community Unit 220. Those three districts account for about 71% 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 McHenry County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Community Unit School District 300 | 20,705 | 39.8% | ▴ 1.1% |
| Huntley Consolidated School District 158 | 8,401 | 16.2% | ▾ -1.4% |
| Barrington Community Unit School District 220 | 7,936 | 15.3% | ▾ -1.1% |
| Woodstock Community Unit School District 200 | 6,097 | 11.7% | ▾ -0.4% |
| Wauconda Community Unit School District 118 | 4,186 | 8.1% | ▾ -2.2% |
| Download all school district data | |||
McHenry County school district enrollment and trends per most recent NCES reporting data.
McHenry County Housing & Real Estate
McHenry County has a median home value of $286,900 and a median gross rent of $1,358. About 83% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Illinois median, while rents come in above the state average. In March 2026, the median listing price was $421,000 and homes spent about 35 days on the market.
McHenry County Housing Mix
McHenry County housing mix: owner, renter and vacant units.
McHenry County Housing Trends
McHenry County median home value and rent trend (last 5 years).
Businesses in McHenry County, IL
McHenry County has 12,043 business listings across 904 categories. The largest categories in McHenry County business listings are Auto Repair (232, 1.9%), Contractors (218, 1.8%), and Parks & Recreation (214, 1.8%). The full McHenry County business listings dataset includes names, categories, addresses and contact details where available. McHenry County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in McHenry County, IL
| Category | Businesses | Share |
|---|---|---|
| Auto Repair | 232 | 1.9% |
| Contractors | 218 | 1.8% |
| Parks & Recreation | 214 | 1.8% |
| Real Estate Agents | 205 | 1.7% |
| Insurance Agencies | 159 | 1.3% |
| Medical Offices | 156 | 1.3% |
| Churches & Religious Organizations | 149 | 1.2% |
| Professional Services | 131 | 1.1% |
| Farm | 127 | 1.1% |
| Pizza Restaurants | 124 | 1.0% |
McHenry County Business Listings
| Business | Category | City |
|---|---|---|
| New Directions Addiction Recovery Services | Abuse And Addiction Treatment | Crystal Lake |
| Woodstock Commons Apartments | Accommodation | Woodstock |
| JL Accounting Inc | Accountant | Woodstock |
| Snap Fitness | Active Life | McHenry |
| Nature's Balance Acupuncture | Acupuncture | Crystal Lake |
| Addiction Treatment McHenry | Addiction Rehabilitation Center | McHenry |
| Fantasy Factory - McHenry, IL | Adult Entertainment | McHenry |
| 3DS Signs | Advertising Agency | Algonquin |
| Mohs Surgery & Dermatology Center | Aesthetician | Huntley |
| Conserv FS | Agricultural Cooperatives | Woodstock |
| Download McHenry County business listings | ||
McHenry County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
McHenry County Basemaps
McHenry 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 McHenry County Data Package
This page shows a preview of what's included in the McHenry 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 McHenry County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.