Blog · October 14, 2026 · Ohio
Marion County Flood Zone Map (Ohio)
How to check whether a property in Marion County sits in a FEMA flood zone, and what the answer means for a buyer near New Bloomington.
Main page: Marion County, OH GIS & Parcel Viewer (official map link, Marion County facts and neighboring maps).
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Before you buy a house in La Rue, add on to a barn near Prospect, or price a lot along the creek bottoms near Brush Ridge, check the Marion County flood zone map. For any tract in Marion County, Ohio, the answer affects insurance, permits and resale.
We'll cover finding a Marion County address on FEMA's map, what Zone A, AE and X mean, how the county viewer fits in, and what to do if the map looks wrong.
Look up the Marion County flood zone map step by step
FEMA's official flood maps for Marion County are free at the FEMA Flood Map Service Center. Download the FIRM panel FEMA lists as effective for that part of Marion County. If the PDF panel for Marion County is hard to read, the National Flood Hazard Layer viewer is easier to use, so you can see whether the shading reaches a house near New Bloomington. Switch to the Ohio Statewide Parcels layer in ArcGIS Map Viewer and locate the same tract close to New Bloomington. Match the Marion County lines and acreage to the FEMA view, since flood maps do not draw property lines in detail.
Search Marion County parcels by owner, address or ID
There's no separate Marion County parcel site to hunt for; the Ohio Statewide Parcels layer in ArcGIS Map Viewer carries the county's parcels along with the rest of Ohio. Use the search box for an address in Morral or a parcel number, or simply zoom in and click a tract close to Caledonia. For a backup route to the map covering Caledonia, our Marion County directory entry keeps the link current.
Deeds and plats behind the Marion County map
For land near La Rue, the deed itself lives in the county recording office, and the map is an index to it. Ohio county auditors handle real property appraisal, which means the Marion County auditor's office is the source for values on the map. A deed book and page or instrument number on the county record is the quickest route to order the document for a lot in La Rue.
Reading the zones on a Marion County flood map
For a lot in Morral, the label matters more than the color: A and V zones are Special Flood Hazard Areas, meaning FEMA estimates a 1-percent annual chance of flooding. Where a Marion County tract shows Zone AE, there's a base flood elevation to compare a building against; in Zone A there isn't one. Land near New Bloomington in shaded X (Zone B on older maps) sits in the moderate band between the 100-year and 500-year floods. Unshaded Zone X near New Bloomington is minimal risk.
The lay of the land around Marion
Town lots cluster around Marion, the county seat, and Caledonia, Green Camp, La Rue, and Morral. Smaller places such as Bellaire Gardens, Big Island, and Brush Ridge appear on the county map as little clusters of lots. Census Bureau estimates put Marion County at about 64,851 residents in 2023 on roughly 404 square miles of land. The Marion County map mixes subdivision lots near Green Camp with farm and wooded tracts farther out.
Near the Marion County line
Marion County borders Crawford County, Delaware County, Hardin County, Morrow County, and Union County, and each keeps its own parcel map and records. Our Ohio page links each map neighboring Marion County.
Low ground and small streams around Morral
A low spot on a Marion County tract outside any mapped zone can still flood; FEMA says moderate- and low-risk areas still carry risk.
Flood insurance and building rules in Marion County
The zone shows up again when a loan on a house near New Bloomington is underwritten. When a structure near New Bloomington sits in a Special Flood Hazard Area and carries a federally backed mortgage, federal rules call for flood insurance under the Flood Disaster Protection Act, wherever the community joins the NFIP. For a county home in shaded or unshaded X, coverage is optional; pricing a policy for land near New Bloomington is still worth a call. Where a structure near Morral looks higher than the shading suggests, FEMA's LOMA process allows a review; a surveyor near New Bloomington can supply the elevation data. Building or filling inside a mapped zone near Morral most frequently needs a floodplain permit; the county floodplain administrator can say what applies.
Marion County, OH: common questions
How can I check a Marion County, OH flood zone?
Search the Green Camp address on FEMA's Flood Map Service Center; the effective panel shows the zone, and the county parcel map confirms the tract.
What does Zone AE mean on a Marion County flood map?
For a Marion County parcel, Zone AE means a Special Flood Hazard Area with a 1-percent annual chance of flooding and a published base flood elevation.
Can I build in a flood zone in Marion County?
Often, but local floodplain rules apply; ask the county or town building office in Green Camp well before you buy.
Does a 100-year floodplain near La Rue flood only once a century?
Not at all; a Marion County tract in that zone faces a 1-percent annual chance, not a once-a-century schedule.
What if FEMA's map is wrong about my house near La Rue?
FEMA reviews requests such as a LOMA for Marion County properties; start with an elevation certificate.
Does the Marion County parcel map show flood zones?
Some county viewers carry a flood layer, but FEMA's Flood Map Service Center is the official source for Marion County.
Open the official Marion County, OH parcel map Marion 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.