Reference only. Data sourced from HUD/FHFA (2025). This site is a private entity and not affiliated with any government agency.
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Flood risk by county

National Risk Index scores attached to every county calculator.

CountyRiskScoreDetails
Adair CountyVery High98View
Adams CountyVery High98View
Allamakee CountyVery High98View
Appanoose CountyVery High98View
Audubon CountyVery High98View
Benton CountyModerate32View
Black Hawk CountyVery High95View
Boone CountyLow22View
Bremer CountyVery High95View
Buchanan CountyVery High98View
Buena Vista CountyVery High89View
Butler CountyVery High98View
Calhoun CountyVery High98View
Carroll CountyModerate32View
Cass CountyVery High98View
Cedar CountyVery High98View
Cerro Gordo CountyHigh64View
Cherokee CountyVery High98View
Chickasaw CountyVery High98View
Clarke CountyVery High98View
Clay CountyVery High87View
Clayton CountyVery High98View
Clinton CountyModerate35View
Crawford CountyVery High98View
Dallas CountyModerate39View
Davis CountyVery High98View
Decatur CountyVery High98View
Delaware CountyVery High98View
Des Moines CountyModerate30View
Dickinson CountyVery High88View
Dubuque CountyModerate40View
Emmet CountyVery High98View
Fayette CountyVery High98View
Floyd CountyVery High98View
Franklin CountyVery High98View
Fremont CountyVery High98View
Greene CountyVery High98View
Grundy CountyVery High95View
Guthrie CountyModerate39View
Hamilton CountyVery High98View
Hancock CountyVery High98View
Hardin CountyVery High98View
Harrison CountyHigh73View
Henry CountyVery High98View
Howard CountyVery High98View
Humboldt CountyVery High98View
Ida CountyVery High98View
Iowa CountyVery High98View
Jackson CountyVery High98View
Jasper CountyModerate39View
Jefferson CountyModerate43View
Johnson CountyModerate53View
Jones CountyModerate32View
Keokuk CountyVery High98View
Kossuth CountyVery High98View
Lee CountyModerate45View
Linn CountyModerate32View
Louisa CountyVery High98View
Lucas CountyVery High98View
Lyon CountyVery High98View
Madison CountyModerate39View
Mahaska CountyHigh73View
Marion CountyHigh75View
Marshall CountyHigh64View
Mills CountyHigh73View
Mitchell CountyVery High98View
Monona CountyVery High98View
Monroe CountyVery High98View
Montgomery CountyVery High98View
Muscatine CountyHigh69View
O'Brien CountyVery High98View
Osceola CountyVery High98View
Page CountyVery High98View
Palo Alto CountyVery High98View
Plymouth CountyVery High98View
Pocahontas CountyVery High98View
Polk CountyModerate39View
Pottawattamie CountyHigh73View
Poweshiek CountyVery High98View
Ringgold CountyVery High98View
Sac CountyVery High98View
Scott CountyModerate38View
Shelby CountyVery High98View
Sioux CountyVery High98View
Story CountyLow22View
Tama CountyVery High98View
Taylor CountyVery High98View
Union CountyVery High98View
Van Buren CountyVery High98View
Wapello CountyHigh73View
Warren CountyModerate39View
Washington CountyModerate53View
Wayne CountyVery High98View
Webster CountyModerate45View
Winnebago CountyVery High98View
Winneshiek CountyVery High98View
Woodbury CountyVery High87View
Worth CountyHigh64View
Wright CountyVery High98View