Illinois · FIPS 17161 · County seat: Rock Island
Rock Island County, IL GIS & Parcel Viewer
Parcel lookups for Rock Island County start at the Rock Island County ArcGIS parcel map. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Rock Island County parcel map ↗
Opens gis.rockislandcountyil.gov in a new tab. We link out and never embed or copy parcel data.
Rock Island County at a glance
| Official map | Rock Island County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | gis.rockislandcountyil.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Rock Island |
| Population | 141,236 (2023 Census Bureau estimate) |
| Land area | 427 sq mi |
| FIPS code | 17161 |
About the official source
It is a county-level map: Rock Island County or the company it hires keeps the parcel layer up to date. As of our October 2026 test, anyone could open it without signing in or paying.
Searching for a parcel, step by step
- Open the official link; it loads in ArcGIS Map Viewer, Esri's standard web map.
- Zoom to the area you want, or enter an address in the search field.
- Select a parcel to see its pop-up details.
- Try the Basemap gallery for satellite views, and the Measure tool if you want a rough distance or area.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
Rock Island County by the numbers
Rock Island County had an estimated 141,236 residents in 2023, according to the Census Bureau. With about 427 square miles of land, that works out to roughly 331 people per square mile. By population it ranks 14th of 102 counties in Illinois. The county seat is Rock Island.
Counties next to Rock Island County
Parcels close to the edge of Rock Island County can fall in the next county over. Neighboring counties:
- Henry County
- Mercer County
- Whiteside County
- Clinton County, IA
- Louisa County, IA
- Muscatine County, IA
- Scott County, IA (state list)
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.