Blog · October 14, 2026 · Iowa
Using the Johnson County Flood Zone Map
Flood zones are set by FEMA, and checking one near Coralville takes a few minutes.
Main page: Johnson County, IA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Amish? Checking the Johnson County flood zone map reveals whether it sits in a FEMA flood zone, and no account is needed. Covered here for Johnson County: finding the address on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
Getting started with the Johnson County flood zone map
If the land is near North Liberty, flood zones come from FEMA's Flood Map Service Center: enter the street address, then open the map view for that panel. Vacant ground around Frytown can still be found: zoom in from US Route 218 and click the spot.
The viewer Johnson County publishes
Begin with the Johnson County Beacon site; it maps each tax parcel around Hills and Oxford. If you only know roughly where the land is, pan along US Route 218 until the lines appear, then click inside the one you want, whether the land is near North Liberty or elsewhere in the county. With a lot near Hills, save the parcel ID from that panel; each clerk in the county will want it.
On site with the map
Most viewers work in a phone browser, handy when you're parked on a road near North Liberty, so load it before you lose signal. A printout of the tract near Coralville is a good backup.
Reading A, AE and X
For property near North Liberty, A and V zones are Special Flood Hazard Areas, which FEMA defines as a 1% annual chance of flooding. For acreage around Lone Tree, minimal risk is not no risk: according to FEMA, floods happen outside mapped zones too.
A word on accuracy
In and around Amish, listed acreage is an estimate; only a licensed surveyor can set the real boundary on the ground. If the land is near Oakdale, owner names and values update on a schedule, so a deed recorded last month might lag behind.
How land is described here
Iowa uses the Public Land Survey System, so rural legal descriptions near North Liberty cite section, township and range. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though sections near Amish can be irregular. Write down the legal description for the tract near Oakdale before you request a deed or survey.
The paper trail behind a parcel
Before you sign anything, pull the recorded deed from the County Recorder; the viewer just points to it, which applies near Coralville as much as anywhere. Long-held tracts near Oxford may sit on many deeds, and a title company earns its fee on a real sale.
Places you'll see on the map
Iowa City serves as the county seat, home to the main records offices. You'll also find Coralville, Hills, Lone Tree, and North Liberty. Roughly 157,528 people call Johnson County home (Census estimate, 2023) spread over roughly 613 square miles. The county was formed in 1837, so old deeds can run back a long way, especially near Oxford.
What to request from a seller
For land near Hills, ask the listing agent whether the home has flooded before closing; getting a quote early avoids surprises.
Which office to call
Questions about value or the owner field for land near Lone Tree are handled by the County Assessor, which maintains the tax roll. Building or septic questions for a lot near Cosgrove need the planning or permitting office, depending on whether the land is inside town limits.
Matching the zone to the lot lines
FEMA doesn't draw property lines, so open the Johnson County Beacon site next for the outline of the tract near Coralville.
Low spots and local drainage
Low-lying fields near Cosgrove aren't always studied in detail, so look for water marks and debris lines. Wet ground around Iowa City is a separate issue from flood zones; the National Wetlands Inventory mapper shows mapped wetlands.
Lenders and permits
If a building sits in a Special Flood Hazard Area and a federally regulated lender is involved, the lender will require flood insurance in communities in the NFIP, whether the land is near Coralville or elsewhere in the county. Remodeling a house in a zone near Iowa City usually means extra permit review; call the permitting office early.
Questions about the Johnson County flood zone map
Will my lender require flood insurance near Cosgrove?
For land near Amish, it's typically required only for structures in high-risk zones with federally backed loans; outside those zones it's your call.
Why did my flood zone near Frytown change?
For a tract near Iowa City, FEMA revises flood maps panel by panel as new studies finish; check the effective date on the panel.
What is a LOMA around Iowa City?
Closer to North Liberty, a Letter of Map Amendment (LOMA) from FEMA can remove a structure on naturally high ground; it starts with an elevation survey.
Where can I see the Johnson County flood zone map for free?
It depends, but FEMA's free map shows the zone for any spot near Iowa City, and the zone code appears on the map.
Is the parcel map a survey near Amish?
Near Shueyville, parcel lines are tax drawings, not surveys; a survey sets the real corners
Open the official Johnson 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.