Illinois · FIPS 17003 · County seat: Cairo
Alexander County, IL GIS & Parcel Viewer
Looking for lot lines or a parcel number in Alexander County, IL? The quickest route is the Alexander County ArcGIS parcel map, the county parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Alexander County parcel map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Alexander County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Cairo |
| Population | 4,695 (2023 Census Bureau estimate) |
| Land area | 235 sq mi |
| FIPS code | 17003 |
About the official source
This map is published by or for Alexander County itself, so it reflects the local parcel layer rather than a third-party copy. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Alexander County viewer
- 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.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
The county in brief
The U.S. Census Bureau estimated Alexander County's population at 4,695 in 2023, spread over about 235 square miles of land, or roughly 20 people per square mile. That makes it number 98 out of 102 Illinois counties by population. Its county seat is Cairo.
Counties next to Alexander County
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Alexander County:
- Pulaski County (state list)
- Union County (state list)
- Ballard County, KY
- Cape Girardeau County, MO
- Mississippi County, MO (state list)
- Scott County, MO
Before you rely on the lines
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.