Blog · October 14, 2026 · Illinois
Clark County Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Marshall takes a few minutes.
Main page: Clark County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around West Union? A quick look at the Clark County flood zone map shows whether FEMA puts it in a high-risk zone, and the lookup is free. In this county guide: locating a parcel on FEMA's map, reading the zone codes, and pairing it with the Clark County Beacon site, especially near West Union.
Checking the Clark County flood zone map step by step
If you'd rather pan and zoom, use the National Flood Hazard Layer viewer, which draws the zones over aerial imagery, which applies near West Union as much as anywhere. Rural land near Clark Center with no street number is still easy to locate: pan from the closest town then click the parcel area.
Getting to the right map
Begin with the Clark County Beacon site; it maps each assessed parcel from Embarras River to Clarksville. With a lot near Embarras River, enter a street address, an owner's name or a parcel number, and the matching parcel lights up. On ground around Adenmoor, save the parcel ID from that panel; every clerk in the county will want it.
What the zone letters mean
If you're looking near Casey, zones beginning with A or V are Special Flood Hazard Areas, meaning a 1% or greater chance of flooding each year. If you're looking near Martinsville, a shaded X area is moderate risk, between the 1% and 0.2% annual chance floods; unshaded X is minimal risk.
A word on accuracy
In and around Castle Fin, acreage on the record is a tax-roll number; just a licensed surveyor sets the real boundary on the ground. Closer to Marshall, records update in batches, so a deed recorded last month can take weeks to appear.
Getting your bearings
Marshall serves as the county seat, home to the main records offices. Other places on the map include Casey, Martinsville, Westfield, and West Union, where town lots give way to larger tracts. Roughly 15,088 people call Clark County home (Census Bureau estimate, 2023) spread over roughly 501 square miles. Clark County dates to 1819, so old deeds can run back a long way. Places such as Embarras River make handy reference points on the map.
Using it on a phone
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Castle Fin, though signal can drop in rural spots. A screenshot of the parcel near Clarksville with its ID keeps working without signal.
Water near Marshall
Low-lying fields near Westfield may not have detailed mapping, so walk the land after rain. Wetlands near Castle Fin can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
Neighboring parcel maps
Clark County meets Coles County, Crawford County, Cumberland County, Edgar County, and Jasper County; every one of them runs a separate parcel map. A tract near the line by West Union may show up in two county records, so check the neighboring map as well. For a parcel near Castle Fin, our state page lists every neighboring county map across Illinois.
What to request from a seller
In and around West Union, request for any Elevation Certificate before closing; an insurance quote early keeps the budget honest.
Who handles what
Anything recorded against property around West Union come from the county Recorder of Deeds (in many counties the County Clerk and Recorder), sometimes only in person. Building or septic questions for a lot near Embarras River are for the local planning and health departments, and the answer depends on jurisdiction.
Lining it up with the parcel map
FEMA doesn't draw property lines, so check the Clark County Beacon site too to confirm you have the right parcel near Castle Fin.
Insurance, lenders and building
For a structure inside an A or V zone and a federally regulated lender is involved, the lender will require flood insurance in communities in the NFIP, whether the land is near Embarras River or elsewhere in the county. New construction in a floodplain near Adenmoor can trigger elevation rules; check with the county or town building office before you plan.
The paper trail behind a parcel
The map is an index, not the title: recorded deeds, plats and easements covering ground around Marshall are filed with the county Recorder of Deeds (in many counties the County Clerk and Recorder). If you're looking near Adenmoor, use the document number listed on the parcel record to skip a name search.
Clark County: common questions
Does the county parcel map show flood zones around West Union?
The parcel map near Embarras River might show FEMA zones, but FEMA's own map is the official source.
When is flood insurance required near Castle Fin?
In and around Embarras River, it's typically required only for structures in high-risk zones with federally backed loans; outside those zones it's your call.
What is a base flood elevation for land near Westfield?
If you're looking near Martinsville, the base flood elevation is the water level expected in the 1% annual chance flood; local rules may require building above it.
How often are flood maps updated around Westfield?
If you're looking near West Union, FEMA revises flood maps panel by panel as new studies finish, so look at the panel date.
Does the parcel map work on a phone near Embarras River?
For acreage around West Union, no app is needed for most county viewers; screenshots help offline.
Open the official Clark 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.