Crystal Lake city, Illinois
Official LSAD Designation: Crystal Lake city • Census GEOID: 1717887
• McHenry County
Crystal Lake city is an incorporated city in McHenry County, Illinois. According to official records from the Census (2025), Crystal Lake city had an estimated population of 42,288 residents. Official Census Bureau geographic records classify this community under LSAD designation Crystal Lake city (GEOID 1717887).
Local Government Administration U.S. Census Bureau GMAF
City Of Crystal Lake
Municipal
Official Title:
Accountant
Address:
PO BOX 597, CRYSTAL LAKE IL 60039-0597
County Of Mchenry
County
Official Title:
Auditor
Address:
2200 N SEMINARY AVE, WOODSTOCK IL 60098-2693
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 42,288 | 2025 |
| Median Household Income | $108,418 | 2020-2024 |
| Median Home Value | $311,400 | 2020-2024 |
| Land Area | 18.97 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).