Blog · October 14, 2026 · Illinois
Herrin Plat Map, Illinois: plats and lots
A recorded plat shows how land near Carterville was divided into lots.
Main page: Williamson County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Buying a lot in a subdivision near Freeman Spur? What you want is the Herrin plat map, as it records the lot layout that deeds refer to. In this Herrin guide: where plats are filed, how a plat differs from a parcel map, and what to look for on the sheet.
Getting started with the Herrin plat map
For land around Crainville, the deed or parcel record often names the subdivision and plat reference; that makes the request quick.
Getting to the right map
Go first to the Williamson County Beacon site; it covers every assessed parcel in the county, Carterville included. If you only know roughly where the land is, zoom in from Crainville and select the outline. If you're looking near Freeman Spur, a pop-up or side panel normally shows the owner of record, acreage on the tax roll, the parcel number and sometimes recent sales.
Who handles what
For assessment questions about property around Cambria are handled by the Supervisor of Assessments, working with township assessors, the office behind the parcel record. Questions about what you can build around Cambria go to planning, building or health offices, depending on whether the land is inside town limits.
When a plat changes
An amended plat may change lots around Crainville, so check for later filings; vacated streets or alleys also get recorded.
Places you'll see on the map
Marion serves as the county seat, where most land records are kept. You'll also find Energy, Colp, Crainville, and Carterville, where town lots give way to larger tracts. About 66,706 people call Williamson County home (Census Bureau estimate, 2023) across some 420 square miles. Williamson County was formed in 1839, and some chains of title near Crainville are long. Features like Crab Orchard National Wildlife Refuge are easy to spot when you zoom out from Freeman Spur.
Recorded documents worth pulling
The map is an index, not the title: deeds, subdivision plats and easements for land near Carterville sit with the county Recorder of Deeds (in many counties the County Clerk and Recorder). Closer to Carterville, use the book and page from the tax record so staff can find the deed fast.
City limits and county records
Herrin lies within Williamson County, Illinois, which means parcel data comes from the county. If the land is near Cambria, the municipality handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Lots just outside the city limits out by Cambria generally answers to county rules rather than the town's.
Field tips
Most viewers work in a phone browser, handy when you're parked on a road near Cambria, but coverage can be spotty out of town. A printout of the tract near Cambria helps when you meet an owner or agent.
Metes and bounds instead
Rural land near Carterville that was never subdivided may have no plat at all; look for a recorded survey for land near Cambria.
How a plat differs from the tax map
The tax map on the Williamson County Beacon site is a summary, whereas the plat carries surveyed dimensions.
Next door to Williamson County
Williamson County touches Franklin County, Jackson County, Johnson County, Pope County, and Saline County, and each of those keeps its own parcel map. Ground near Cambria that runs to the line may show up in two county records, so look at the neighboring map before you assume the acreage. For acreage around Energy, the Platbookmapper state page lists each bordering county map for Illinois.
Reading the legal description
Illinois uses the Public Land Survey System, so deeds around Freeman Spur reference sections and townships. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though sections near Carterville can be irregular. Write down the legal description for the tract near Colp when you talk to a surveyor.
A word on accuracy
Acreage on the record is an estimate; only a licensed surveyor sets the real boundary on land around Colp. Records update in batches, so a recent sale near Energy might lag behind.
What a plat shows
Easements on the plat near Cambria limit where you can build or fence; check the plat notes and any covenants.
Online indexes and office visits
With a lot near Crainville, some counties put plat images online, otherwise call or visit with the reference; small fees are common.
Questions about the Herrin plat map
How is a plat different from the parcel map near Freeman Spur?
The plat near Carterville is recorded, while the GIS layer is an approximation.
What is a replat for land near Energy?
Short answer: lot splits in Herrin go through the planning office; ask staff about the process.
Are old plats online in Herrin?
On ground around Cambria, it varies; some offices have scanned older plats and some haven't, including older subdivisions.
Where can I find the Herrin plat map?
Recorded plats near Freeman Spur are filed with the county Recorder of Deeds (in many counties the County Clerk and Recorder); use the plat reference from the deed or parcel record.
What's the tax parcel number used for near Freeman Spur?
It's the number the Supervisor of Assessments, working with township assessors uses to track a tract near Crainville; copy it before you call anyone.
Open the official Williamson County, IL parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.