Illinois · FIPS 17055 · County seat: Benton
Franklin County, IL GIS & Parcel Viewer
Franklin County, Illinois parcel data lives on the Franklin County myGISonline viewer. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Franklin County parcel map ↗
Opens portico.mygisonline.com in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Franklin County myGISonline viewer |
|---|---|
| Type | County-run map |
| Website | portico.mygisonline.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Benton |
| Population | 37,138 (2023 Census Bureau estimate) |
| Land area | 409 sq mi |
| FIPS code | 17055 |
About the official source
This map is published by or for Franklin 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.
Searching for a parcel, step by step
- Open the official link; the map is hosted on myGISonline, a vendor platform used by 13 counties in our directory.
- Accept any disclaimer, then use the search tool to find a street address, owner or parcel ID.
- Click a parcel to view its attributes.
- Use the layer or basemap controls to add aerials and other layers where the county provides them.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
Franklin County had an estimated 37,138 residents in 2023, according to the Census Bureau. With about 409 square miles of land, that works out to roughly 91 people per square mile. That makes it number 35 out of 102 Illinois counties by population. Its county seat is Benton.
Counties next to Franklin County
Parcels close to the edge of Franklin County can fall in the next county over. Neighboring counties:
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.