Blog · October 14, 2026 · Illinois
Using the Henry County Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near Annawan.
Main page: Henry County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before you buy or build near Colona, look at the Henry County flood zone map: FEMA's zone label affects insurance, permits and resale. What this county guide covers: locating a parcel on FEMA's map, reading the zone codes, and pairing it with the county WTH GIS map around Annawan.
The Henry County flood zone map: start here
For parcel-by-parcel detail, try the National Flood Hazard Layer viewer, which draws the zones over aerial imagery, and that holds around Dayton too. Rural land near Cambridge with no street number can still be found: search the nearest road then click the parcel area.
The viewer Henry County publishes
Go first to the Henry County WTH GIS map; it covers each tax parcel from Galva to Osco. Near Nekoma, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. For a home near Osco, save the parcel ID while you have it open; every office in the county will want it.
Decoding the flood zone labels
If you're looking near Kewanee, A and V zones are Special Flood Hazard Areas, meaning a 1% or greater chance of flooding each year. If you're looking near Osco, a shaded X area marks moderate flood hazard, roughly the 100- to 500-year range; unshaded X is minimal risk.
Matching the zone to the lot lines
FEMA doesn't draw property lines, so check the Henry County WTH GIS map too for the outline of the tract near Lynn Center.
Field tips
The parcel map usually runs in a mobile browser, useful out on a road near Geneseo, but coverage can be spotty out of town. A printout of the tract near Atkinson helps when you meet an owner or agent.
Getting your bearings
Cambridge holds the county offices, home to the main records offices. Smaller places on the map include Colona, Galva, Geneseo, and Kewanee, each with its own cluster of lots. Roughly 48,448 people call Henry County home (Census Bureau estimate, 2023) spread over some 823 square miles. The county dates to 1825, so old deeds can run back a long way around Kewanee.
A short flood checklist
If the land is near Osco, ask the seller about past flood claims before closing; getting a quote early keeps the budget honest.
What a flood zone means for a buyer
For a structure inside an A or V zone and the loan is federally backed or regulated, the lender will require flood insurance where the community participates in the National Flood Insurance Program, whether the land is near Lynn Center or elsewhere in the county. New construction in a floodplain near Geneseo often needs a floodplain permit; ask the local floodplain administrator early.
What the map can't tell you
If you're looking near Kewanee, acreage on the record is an assessed number; just a licensed surveyor can set the real lines on the ground. For property near Annawan, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Deeds, plats and who keeps them
For anything that matters, pull the recorded deed through the county Recorder of Deeds (in many counties the County Clerk and Recorder); the parcel line is a drawing of it, which applies near Lynn Center as much as anywhere. Long-held tracts near Kewanee can sit on several deeds, and a title company can sort it out before a purchase.
When a parcel crosses a boundary
Henry County touches Bureau County, Knox County, Mercer County, Rock Island County, and Stark County; every one of them runs a separate parcel map. Ground near Atkinson that runs to the line can show up across two assessors' files, so look at the adjacent map as well. Closer to Geneseo, our state page lists every neighboring county map across Illinois.
Low spots and local drainage
Low-lying fields near Atkinson may not have detailed mapping, so walk the land after rain. Wetlands near Colona can limit building even outside a flood zone; check the National Wetlands Inventory mapper for a first look.
Getting answers from the right desk
Anything recorded against property around Lynn Center are with the county Recorder of Deeds (in many counties the County Clerk and Recorder), sometimes only in person. Questions about what you can build around Colona need the planning or permitting office, and the answer depends on jurisdiction.
Quick answers
Why did my flood zone near Lynn Center change?
In and around Galva, FEMA revises flood maps panel by panel as new studies finish; your community is notified before changes take effect.
When is flood insurance required near Ophiem?
Lenders generally require it for buildings near Nekoma in a Special Flood Hazard Area when the loan is federally regulated or insured; outside those zones it's your call.
How do I get a property removed from a flood zone in Henry County?
It depends, but you can ask FEMA for a LOMA if surveyed elevations show the building near Atkinson is above the BFE, and lenders accept the result.
Is my property near Galva in a flood zone?
It depends, but search the address near Annawan on FEMA's Flood Map Service Center, which takes a couple of minutes.
Why do offices ask for the parcel ID near Atkinson?
It's the number the Supervisor of Assessments, working with township assessors uses to track a tract near Kewanee; copy it before you call anyone.
Open the official Henry County, IL 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.