Blog · October 14, 2026 · Missouri
Chariton County Flood Zone Map in Missouri
How to check if a property in Chariton County sits in a FEMA flood zone, and what the answer means for a buyer near Keytesville.
Main page: Chariton County, MO GIS & Parcel Viewer (official map link, Chariton County facts and neighboring maps).
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The Chariton County flood zone map question tends to arrive at a bad moment: a lender's letter, an insurance quote, or a permit counter in Dalton. FEMA's free Flood Map Service Center and the Chariton County parcel viewer answer it together.
Next: FEMA's search tool, the zone labels you'll see for Chariton County, and how the parcel record confirms which tract you're on.
Where to see the official Chariton County flood zone map
Open the FEMA Flood Map Service Center and type a county street address, say one in Brunswick. The site returns the effective Flood Insurance Rate Map (FIRM) panel covering that Brunswick location, which you can view or download. For an irregular lot near Keytesville, the National Flood Hazard Layer viewer is easier to use and reports the zone wherever you click near Brunswick. Switch to the IntegrityGIS - Chariton County and find the same tract close to Keytesville. If the Chariton County viewer has a floodplain layer, treat it as a convenience copy and confirm on FEMA's map.
Opening the Chariton County parcel viewer
For land around Brunswick, open the IntegrityGIS - Chariton County (an Integrity GIS parcel viewer); it's the map Chariton County itself publishes. Most people find their Chariton County tract fastest by searching an address in Brunswick, then clicking the outline. If the official address for the Chariton County, MO map ever changes, our directory page carries the current link for Rothville and the rest of the county.
Towns and land across Chariton County
Town lots cluster around Keytesville, the county seat, and Brunswick, Dalton, Marceline, and Mendon. Smaller places such as Prairie Hill, Bynumville, and Cunningham appear on the Chariton County map as little clusters of lots. Chariton County had an estimated 7,399 people in 2023 (Census Bureau), spread across about 751 square miles. Outside Mendon, most of the county map is farm, ranch or timber ground with large, irregular tracts. Chariton County was organized in 1820, so deeds for older farms near Salisbury can run back a long way.
Neighboring maps around Chariton County
Chariton County borders Carroll County, Howard County, Linn County, Livingston County, and Macon County, and each keeps its own parcel map and records. Every map bordering Chariton County is listed on our Missouri directory.
High, moderate and minimal risk in Chariton County
On the FIRM covering Chariton County, zones that start with A or V are Special Flood Hazard Areas, defined by a 1-percent annual chance of being flooded. Where a Chariton County tract lists Zone AE, there's a base flood elevation to compare a building against; in Zone A there isn't one. Land near Keytesville in shaded X (Zone B on older maps) is moderate risk, between the 1-percent and 0.2-percent annual chance lines. Unshaded X (or C) on the Chariton County panel means minimal risk.
Low ground and small streams around Brunswick
A creek near Keytesville that lists no detailed zone, so treat an unmapped channel as a reason to ask questions, not proof the ground stays dry.
Deeds and plats behind the Chariton County map
The parcel layer for Chariton County points back to recorded deeds and plats, kept by the county's recording office (its title varies by state). Easements and access rights near Brunswick live in recorded documents, so read the deed, not just the county map.
Insurance, permits and map changes
The zone lists up again when a loan on a house near Keytesville is underwritten. Where a building in Brunswick sits in a Special Flood Hazard Area and carries a federally backed mortgage, the lender must require flood coverage under the Flood Disaster Protection Act, wherever the community joins the NFIP. For a Chariton County home in shaded or unshaded X, federal rules do not require a policy, although some lenders require it anyway. Think the map is wrong about a house in Brunswick? A Letter of Map Amendment request is the formal route, supported by elevation data from a professional surveyor. New construction in a Chariton County Special Flood Hazard Area frequently requires a permit and an elevation check; the Chariton County floodplain administrator can say what applies.
Quick answers for Chariton County
What does 100-year flood mean for Chariton County land?
No, ground around Keytesville mapped that way faces a 1-percent annual chance, and two floods in one decade near Keytesville are possible.
Is there a floodplain layer in the IntegrityGIS - Chariton County?
Check the layer list in the IntegrityGIS - Chariton County; if Chariton County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Do I need flood insurance in Zone X in Chariton County?
Not under federal rules; Zone X in Chariton County is outside the Special Flood Hazard Area, although a lender can still require coverage.
What does BFE mean on the flood map for Keytesville?
For a Chariton County property in Zone AE, the BFE is the height floodwater is expected to reach in the 1-percent-annual-chance flood; elevation certificates in Chariton County are measured against it.
Do I need a permit to build in the floodplain near Keytesville?
Building in a Special Flood Hazard Area near Keytesville most frequently needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
Is Zone AE near Brunswick high risk?
Zone AE on a lot in Keytesville is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
Open the official Chariton County, MO parcel map Chariton 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.