Blog · October 13, 2026 · Illinois
Clark County Plat Book: Parcels, Owners and Property Lines
A practical guide to the Clark County plat book: the official link, towns and land across the county, property lines, and where deeds are recorded.
Main page: Clark County, IL GIS & Parcel Viewer (official map link, Clark County facts and neighboring maps).
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Searching for a Clark County plat book usually means you have a specific piece of ground in mind: a listing near Westfield, a woodlot you drive past, or the lot next door.
Where to open the official Clark County plat book
The Clark County Beacon site is the county's own public parcel viewer; it runs on Schneider Geospatial's Beacon platform. For a tract near Marshall, the report page lists sales history and the legal description, and a map link zooms straight to it. Our Clark County, IL page keeps the current link if the official address changes.
Where to find a Clark County plat book in Illinois
A plat book is the paper cousin of the online parcel map: a township-by-township atlas with owner names, handy in a truck near Martinsville. Treat a printed edition as a handy field reference near Casey and the online map as the current record.
Who needs this map
Land shoppers looking between Westfield and Marshall measure road frontage on the map and check whether a tract is landlocked. Anyone hunting for a buildable lot near Westfield can spot unbuilt parcels on the aerial layer and look up who owns them. A hunter driving the back roads near Adenmoor can match a promising woodlot to an owner name in seconds.
What the map covers, from Marshall to the back roads
Most of the platted lots cluster in and around Marshall (the county seat) and Casey, Martinsville, and Westfield. Unincorporated spots like West Union, Adenmoor, and Castle Fin are worth a look if you want rural acreage near a crossroads community. The county dates to 1819, named for George Rogers Clark, and older deeds may still refer to landmarks from that era. About 15,088 people lived in Clark County in 2023, according to Census Bureau estimates, on roughly 501 square miles. Most of the land area is agricultural or wooded, and the parcel lines get bigger and more irregular as you move away from Westfield. Parcels touching the Embarras River tend to run long and narrow back from the water, a pattern you can see clearly on the Clark County map.
Work and land use in Clark County
By the Census Bureau's 2022 count, 324 business establishments operated in Clark County. Other services had the most, followed by accommodation and food services and retail trade. The sectors that stand out against the national mix are oil and gas extraction, mining (except oil and gas), and wholesale of nondurable goods (including farm products). A surface parcel near Marshall may not include the minerals beneath it, which is common where extraction is active.
How to find property lines in Clark County
Parcel boundaries on the Clark County viewer are drawn to keep tax accounts straight, so small offsets from the true line are expected. Rural Clark County land sits on the federal survey grid: a deed might call out a quarter of a numbered section in a given township and range. If a neighbor's fence near Marshall and the map disagree, neither one is proof. A survey is.
Acreage and vacant lot search
How to work the Clark County plat book for open land:
- Zoom out over the countryside around Marshall with the aerial layer on, and look for parcels with no structures.
- Click each empty tract near Adenmoor and note the owner, acreage and mailing address.
- Pull up three or four similar parcels near Martinsville and compare their land values.
- Trace the frontage on any tract near Adenmoor; without it, access depends on a recorded easement.
- For a tract near Martinsville, confirm zoning, septic suitability and flood status before you make an offer.
To double-check acreage on a parcel near Adenmoor, see how to find the acreage of a property.
Behind the map: land records in Clark County
For land near Martinsville, the parcel record is the index; the recorded deed is the source. Recording offices go by different titles from state to state, including register of deeds, recorder, county clerk and clerk of court; the official Clark County website names the one that handles deeds. Easements and rights-of-way are usually in recorded documents, not on the parcel map, so read the deed itself for a tract near Adenmoor.
Neighboring counties
Shopping near the edge of Clark County? Compare listings in Coles County, Crawford County, and Cumberland County too; prices and parcel sizes can shift across the line. Neighboring maps for Clark County are a click away on our Illinois page.
Quick answers
What is the county seat of Clark County, Illinois?
Marshall is the county seat.
How do I look up a property owner in Clark County, IL?
Owner names for parcels from Westfield to Marshall are on the Clark County Beacon site; search by address or click the map.
Is there a printed plat book for Clark County, Illinois?
Whether a current printed edition exists for Clark County varies; the free online map covering Westfield and the rest of the county is the dependable option.
How do I find property lines in Clark County?
For a lot in Marshall, start with the parcel map, then get the recorded plat; a surveyor sets the exact corners.
Open the official Clark County, IL parcel map Clark County 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.