Illinois · FIPS 17111 · County seat: Woodstock
McHenry County, IL GIS & Parcel Viewer
McHenry County, Illinois parcel data lives on the McHenry County parcel map. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the McHenry County parcel map ↗
Opens mchenrycountygis.org in a new tab. We link out and never embed or copy parcel data.
McHenry County at a glance
| Official map | McHenry County parcel map |
|---|---|
| Type | County-run map |
| Website | mchenrycountygis.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Woodstock |
| Population | 312,800 (2023 Census Bureau estimate) |
| Land area | 603 sq mi |
| FIPS code | 17111 |
Where the parcel data comes from
This map is published by or for McHenry County itself, so it reflects the local parcel layer rather than a third-party copy. When we tested the link in October 2026 it opened with no login and no fee.
Finding a property on this map
- Open the official link in a new tab.
- Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
- Zoom in and click a parcel to see its details.
- Use the map's layer controls to add aerials or other layers if they're offered.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
About McHenry County
Census Bureau figures put McHenry County at about 312,800 people (2023 estimate) on roughly 603 square miles of land, which is about 519 residents per square mile. That makes it number 6 out of 102 Illinois counties by population. Woodstock serves as the county seat.
Neighboring counties
Parcels close to the edge of McHenry County can fall in the next county over. Neighboring counties:
More on McHenry County parcel maps
A note on accuracy
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.