Blog · October 14, 2026 · Iowa
Marshall County Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Dunbar.
Main page: Marshall County, IA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Bangor? A quick look at the Marshall County flood zone map shows whether FEMA puts it in a high-risk zone, and the lookup is free. What this Marshall County guide covers: finding the address on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
Where the Marshall County flood zone map lives
For a tract near Dunbar, the official source is FEMA's Flood Map Service Center: enter the street address, and pick the FIRMette or map view. Rural land near Albion with no street number is still easy to locate: zoom in from US Route 30 then click the parcel area.
Pulling up a parcel
Parcels around Gilman are published on the Marshall County Beacon site, free to use and open without a login. If you only know roughly where the land is, pan along US Route 30 and click the parcel itself, whether the land is near Dunbar or elsewhere in the county. For a home near Laurel, copy the parcel ID before closing the panel; each records desk in the county will want it.
Limits of the parcel data
For a tract near Bangor, listed acreage is a tax-roll number; only a licensed surveyor establishes the real boundary on the ground. Out toward Green Mountain, owner names and values update on a schedule, so a deed recorded last month can take weeks to appear.
Using it on a phone
Most viewers work in a phone browser, handy when you're parked on a road near Marshalltown, though signal can drop in rural spots. A printout of the tract near Marshalltown keeps working without signal.
When a parcel crosses a boundary
Marshall County borders Grundy County, Hardin County, Jasper County, Poweshiek County, and Story County; every one of them runs a separate parcel map. Ground near Laurel that runs to the line can show up in two county records, so look at the adjacent map too. Closer to Green Mountain, our state page lists each neighboring county map across Iowa.
Reading A, AE and X
For a home near Green Mountain, A and V zones are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. For a tract near Bangor, a low-risk label isn't a guarantee: according to FEMA, floods happen outside mapped zones too.
Use the county map alongside FEMA
FEMA's map shows zones but not ownership, so pair it with the Marshall County Beacon site for the outline of the tract near Green Mountain.
Places you'll see on the map
Marshalltown serves as the county seat, home to the main records offices. You'll also find Albion, Clemons, Ferguson, and Gilman, each with its own cluster of lots. Around 40,014 people live in Marshall County (Census estimate, 2023) across some 573 square miles. The county dates to 1846, which matters when you trace an old farm's title around Green Mountain.
What a flood zone means for a buyer
For a parcel near Laurel, an Elevation Certificate from a surveyor helps: it can change the insurance price a lot. New construction in a floodplain near Bromley can trigger elevation rules; call the permitting office before you plan.
Legal descriptions in Iowa
Iowa is laid out under the Public Land Survey System, which means a tract near Clemons is described by section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though sections near Green Mountain can be irregular. Copy the legal description from the record for the parcel near Dunbar for any title or survey request.
Water near Dunbar
Low-lying fields near Clemons may not have detailed mapping, so look for water marks and debris lines. Wet ground around Marshalltown is a separate issue from flood zones; the National Wetlands Inventory mapper shows mapped wetlands.
Offices that can help
Recorded documents for a parcel near Ferguson are with the County Recorder, sometimes only in person. Questions about what you can build around Dunbar need the planning or permitting office, and the answer depends on jurisdiction.
The paper trail behind a parcel
Before you sign anything, pull the recorded deed through the County Recorder; the viewer just points to it, and that holds around Bangor too. For a tract near Bromley, bring the document number from the tax record to skip a name search.
A short flood checklist
If the land is near Bromley, ask the listing agent about past flood claims before closing; getting a quote early keeps the budget honest.
Marshall County: common questions
What is a base flood elevation for land near Ferguson?
For a tract near Haverhill, the BFE is printed in AE zones on FEMA's map; local rules may require building above it.
Do I need flood insurance in Marshall County?
Generally, for a building near Albion in an A or V zone with a federally backed or regulated mortgage, it's generally required, in communities that take part in the NFIP.
Can a flood zone near Laurel change?
It depends, but zones near Bangor can shift when FEMA updates a panel; your community is notified before changes take effect.
What is the difference between Zone A and AE for land near Marshalltown?
On ground around Green Mountain, an AE zone has a 1% annual chance of flooding and a base flood elevation; unnumbered A zones don't list one.
Can I settle a boundary dispute with the map near Clemons?
Closer to Dunbar, parcel lines are tax drawings, not surveys, so a fence may sit off the line
Open the official Marshall County, IA 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.