Illinois · FIPS 17085 · County seat: Galena
Jo Daviess County, IL GIS & Parcel Viewer
Use this page to reach the official county parcel map for Jo Daviess County, Illinois. The button below opens Jo Daviess County GIS Internet Mapping Site in a new tab, so you can look up parcels by address, owner or parcel number on the source site itself.
Open the Jo Daviess County parcel map ↗
Opens gismaps.jodaviesscountyil.gov in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Jo Daviess County GIS Internet Mapping Site |
|---|---|
| Type | County-run map |
| Website | gismaps.jodaviesscountyil.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Galena |
| Population | 21,756 (2023 Census Bureau estimate) |
| Land area | 601 sq mi |
| FIPS code | 17085 |
About the official source
Jo Daviess County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
Finding a property on this map
- Press the button above to open the county's own web map.
- Search for the property or pan and zoom to it.
- Click the lot to bring up what the county publishes about it.
- Look for print or measure tools if you need a quick map or rough size.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
Jo Daviess County by the numbers
The U.S. Census Bureau estimated Jo Daviess County's population at 21,756 in 2023, spread over about 601 square miles of land, or roughly 36 people per square mile. That makes it number 53 out of 102 Illinois counties by population. Galena serves as the county seat.
Neighboring counties
Jo Daviess County shares a border with the counties below. Each link has its own official map:
- Carroll County
- Stephenson County
- Dubuque County, IA
- Grant County, WI (state list)
- Jackson County, IA
- Lafayette County, WI (state list)
Before you rely on the lines
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.