Blog · October 14, 2026 · Illinois
Jackson County Flood Zone Map, Illinois
Look up any Jackson County address on FEMA's flood map, read the zone, and match it to the parcel record for land around De Soto.
Main page: Jackson County, IL GIS & Parcel Viewer (official map link, Jackson County facts and neighboring maps).
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Is that lot in Murphysboro in a flood zone? The Jackson County flood zone map answer comes from FEMA, and it is free to look up. FEMA's free Flood Map Service Center and the Jackson County parcel viewer answer it together.
Below are the FEMA links, a plain reading of the zone labels, notes on where water shapes land around Murphysboro, and short answers to common questions.
How to use the Jackson County flood zone map
FEMA's official flood maps for Jackson County are free at the FEMA Flood Map Service Center. If a tract near Ava has no street number yet, search the nearest road and pan to it. On acreage outside Grand Tower, the National Flood Hazard Layer viewer is easier to use, which shows how much of a county parcel sits inside the zone. Switch to the Jackson County parcel viewer and track down the same tract near Ava. Laying the county parcel outline beside the FEMA shading shows if a homesite near Ava sits above or inside the zone.
Step one: the free Jackson County viewer
The county's own public map is the Jackson County parcel viewer, and it opens without an account for parcels in Dowell and the rest of the county. Most people track down their Jackson County tract fastest by searching an address in Campbell Hill, then clicking the outline. Bookmark our Jackson County page too; it tracks the official Illinois link if it moves and lists the maps around Dowell.
What the flood zone letters mean
On the FIRM covering Jackson County, zones that start with A or V are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any given year (the base or 100-year flood). Zone AE near Ava means FEMA published a base flood elevation; plain Zone A means no detailed elevation was studied. Land near Ava in shaded X (Zone B on older maps) falls between the base flood and the 500-year flood. Clear, unshaded X near Grand Tower is outside the 500-year floodplain.
Creeks, rivers and low ground in Jackson County
The Jackson County landscape includes Big Muddy River, and that's where flood questions cluster. Waterfront and bottomland parcels near Grand Tower often carry a zone along one edge, so check where the buildable part sits. Small streams and ditches near Grand Tower may not be studied in detail can still flood; FEMA says moderate- and low-risk areas still carry risk.
Seller questions about flood history
For a house near De Soto, ask the seller for any elevation certificate on file and the current flood insurance declarations page. Quotes for land near Crain depend on the zone and the building's elevation, so bring both to the agent.
What a flood zone means for a Jackson County buyer
The zone shows up again when a loan on a house near Ava is underwritten. When a county home sits in a Special Flood Hazard Area and secures a loan from a federally regulated or insured lender, flood insurance is mandatory; that applies where the local government around Ava is in the National Flood Insurance Program. In Zone X near Grand Tower, federal rules do not require a policy, although some lenders require it anyway. When a county homesite is on a rise inside a mapped zone, a Letter of Map Amendment request is the formal route; a surveyor near Ava can supply the elevation data. Placing fill on low ground near Grand Tower has to meet local floodplain rules, so call the county or the town office in Grand Tower before work starts.
Jackson County, IL: common questions
Is flood insurance required for a Zone X lot in Carbondale?
FEMA does not require it for a Zone X lot in Carbondale, but coverage is available and some lenders ask for it.
Can a flood zone in Jackson County be changed?
For a lot in Carbondale, hire a surveyor for an elevation certificate, then file a LOMA request with FEMA.
My lot in Carbondale shows Zone AE. What does that mean?
Yes, a tract near Murphysboro in Zone AE is high risk: a 1-percent-annual-chance floodplain where FEMA lists a base flood elevation.
What does BFE mean on the flood map for Carbondale?
On the map covering Carbondale, the base flood elevation marks how high the 100-year flood is expected to rise, and a surveyor compares the building near Carbondale to it.
Who prepares an elevation certificate for a house in Carbondale?
A professional surveyor or engineer prepares it, and the building office serving Carbondale may already have one on file for newer construction.
Does a 100-year floodplain near Murphysboro flood only once a century?
No; land near Murphysboro in the 100-year floodplain faces a 1-percent annual chance, not a once-a-century schedule.
Open the official Jackson County, IL parcel map Jackson 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.