Illinois · FIPS 17087 · County seat: Vienna
Johnson County, IL GIS & Parcel Viewer
We do not have an official parcel map link on file for Johnson County, Illinois yet. The button below runs a web search for the county's GIS or property-records site; check that the result is run by the county or the state before you rely on it.
Search for Johnson County GIS (verify) ↗
Opens a Google search in a new tab. No official link yet: confirm it is the local source before using.
Johnson County at a glance
| Official map | No official link on file yet |
|---|---|
| Link type | Web search (verify the result) |
| County seat | Vienna |
| Population | 13,326 (2023 Census Bureau estimate) |
| Land area | 344 sq mi |
| FIPS code | 17087 |
How to find the official map
- Open the search above and look for a result on the county's own website or a state government site (often a .gov or .us address).
- Common names for the page are GIS, parcel viewer, property search, assessor, auditor or tax map.
- Be careful with paid people-search and data-reseller sites; the official county map is normally free.
- Once the official map opens, search by address, owner name or parcel number, whichever that viewer offers.
The county in brief
Johnson County had an estimated 13,326 residents in 2023, according to the Census Bureau. With about 344 square miles of land, that works out to roughly 39 people per square mile. Its county seat is Vienna.
Neighboring counties
Johnson County shares a border with the counties below. Each link has its own official map:
A note on accuracy
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.