Blog · October 14, 2026 · Iowa
Knoxville Flood Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Melcher-Dallas takes a few minutes.
Main page: Marion County, IA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before an offer near Pella, pull up the Knoxville flood map: FEMA's zone label affects insurance, building rules and resale. This Knoxville guide covers: finding the address on FEMA's map, decoding A, AE and X, and pairing it with the Marion County Beacon site.
Where the Knoxville flood map lives
Flood zones come from FEMA's Flood Map Service Center: search an address around Pleasantville, and pick the FIRMette or map view. Rural land near Harvey with no street number is still easy to locate: zoom in from the nearest road and click the spot.
Where the parcel data lives
Your first stop is the Marion County Beacon site; it maps each assessed parcel from Melcher-Dallas to Marysville. With a lot near Melcher-Dallas, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. If you're looking near Harvey, the record panel normally shows the owner of record, assessed acreage, the parcel number and often a sale date.
Marion County in a few facts
Knoxville is the county seat, which is where the courthouse records live. Smaller places on the map include Harvey, Melcher-Dallas, Pleasantville, and Pella, where town lots give way to larger tracts. About 33,770 people call Marion County home (Census Bureau estimate, 2023) across roughly 554 square miles. Marion County dates to 1845, so old deeds can run back a long way.
Knoxville and the county around it
Knoxville is part of Marion County, Iowa, which means parcel data comes from the county. As the county seat, Knoxville hosts the courthouse, so deeds and plats are filed in town. For acreage around Melcher-Dallas, the municipality handles things like zoning, permits and utilities within town limits, and the county still keeps the parcel and deed records. Acreage past the town limits out by Pella generally falls under county rules, not municipal ones.
Legal descriptions in Iowa
Iowa follows the Public Land Survey System, so deeds around Marysville reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though real sections near Pella vary in size. Write down the legal description for the tract near Marysville when you talk to a surveyor.
What to request from a seller
Ask the seller whether the home has flooded for the house near Marysville; an insurance quote early avoids surprises.
Zones on the Knoxville flood map
An AE label comes with a base flood elevation, which plain A zones lack; builders around Melcher-Dallas design to it. For a tract near Marysville, shaded Zone X is moderate risk, between the 1% and 0.2% annual chance floods; plain X, or C on older maps, is minimal risk.
Before you lean on the lines
The acreage figure is a tax-roll number; just a licensed surveyor establishes the real lines on land around Bussey. If you're looking near Bussey, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Neighboring parcel maps
Marion County meets Jasper County, Lucas County, Mahaska County, Monroe County, and Polk County, and each of those keeps its own parcel map. A tract near the line by Melcher-Dallas can show up in two county records, so check the neighboring map before you assume the acreage. Out toward Bussey, the Platbookmapper state page lists every bordering county map across Iowa.
Parcel lines plus flood zones
FEMA's map shows zones but not ownership, so check the Marion County Beacon site too for the outline of the tract near Melcher-Dallas.
The paper trail behind a parcel
Before you sign anything, request the recorded deed through the County Recorder; the parcel line is a drawing of it, and that holds around Harvey too. Long-held tracts near Melcher-Dallas may go back through a long string of deeds, so a title company earns its fee on a real sale.
Low spots and local drainage
Low-lying fields near Marysville aren't always studied in detail, so walk the land after rain. Wetlands near Marysville can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
What a flood zone means for a buyer
Closer to Pleasantville, an Elevation Certificate from a surveyor helps: it can change the insurance price a lot. Building or adding on near Melcher-Dallas in a mapped zone often needs a floodplain permit; call the permitting office before you plan.
Frequently asked
Where can I see the Knoxville flood map for free?
Short answer: search the address near Pella on FEMA's Flood Map Service Center, which takes a couple of minutes.
Why does the BFE matter near Melcher-Dallas?
It depends, but the base flood elevation is the water level expected in the 1% annual chance flood; surveyors near Bussey use it often.
Can I challenge a flood zone near Harvey?
It depends, but you can ask FEMA for a LOMA if surveyed elevations show the building near Marysville is above the BFE; a surveyor's elevation data supports it.
Will my lender require flood insurance near Pleasantville?
In most cases, for a building near Marysville in an A or V zone with a federally backed or regulated mortgage, it's generally required; outside those zones it's your call.
Where do I find the parcel number for land near Harvey?
Every office uses it to pull the same file for land near Pella; copy it before you call anyone.
Open the official Marion 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.