Flood Risk by County in Iowa
Iowa: 99 counties covered
Across 99 Iowa counties with a FEMA flood score, the average national percentile is 38.1, but that average hides real spread between counties, which is why each one gets its own page rather than a single statewide number.
- Polk County, 92.1th percentile, Relatively Moderate
- Linn County, 86.7th percentile, Relatively Moderate
- Scott County, 88.4th percentile, Relatively Moderate
- Johnson County, 79.8th percentile, Relatively Moderate
- Black Hawk County, 76.6th percentile, Relatively Moderate
- Dallas County, 60.4th percentile, Relatively Low
- Woodbury County, 78.2th percentile, Relatively Moderate
- Story County, 69.1th percentile, Relatively Low
- Dubuque County, 65.4th percentile, Relatively Low
- Pottawattamie County, 74.6th percentile, Relatively Moderate
- Warren County, 35.9th percentile, Relatively Low
- Clinton County, 66.9th percentile, Relatively Low
- Cerro Gordo County, 69th percentile, Relatively Low
- Muscatine County, 62.6th percentile, Relatively Low
- Marshall County, 63.1th percentile, Relatively Low
- Des Moines County, 56th percentile, Relatively Low
- Jasper County, 40.2th percentile, Relatively Low
- Webster County, 47.1th percentile, Relatively Low
- Sioux County, 49.5th percentile, Relatively Low
- Wapello County, 69.3th percentile, Relatively Low
- Marion County, 41.2th percentile, Relatively Low
- Lee County, 70.4th percentile, Relatively Low
- Boone County, 28.8th percentile, Very Low
- Plymouth County, 45.2th percentile, Relatively Low
- Benton County, 40.3th percentile, Relatively Low
- Bremer County, 33.4th percentile, Very Low
- Washington County, 48.4th percentile, Relatively Low
- Mahaska County, 36.4th percentile, Relatively Low
- Jones County, 46.4th percentile, Relatively Low
- Buena Vista County, 32.9th percentile, Very Low
- Buchanan County, 38.6th percentile, Relatively Low
- Carroll County, 37.5th percentile, Relatively Low
- Winneshiek County, 47.5th percentile, Relatively Low
- Jackson County, 43.3th percentile, Relatively Low
- Henry County, 26.7th percentile, Very Low
- Fayette County, 59.2th percentile, Relatively Low
- Poweshiek County, 20.3th percentile, Very Low
- Cedar County, 27.6th percentile, Very Low
- Dickinson County, 49.9th percentile, Relatively Low
- Delaware County, 61.7th percentile, Relatively Low
- Madison County, 36.6th percentile, Relatively Low
- Clayton County, 58th percentile, Relatively Low
- Tama County, 42.4th percentile, Relatively Low
- Clay County, 53.8th percentile, Relatively Low
- Hardin County, 52.9th percentile, Relatively Low
- Iowa County, 32.6th percentile, Very Low
- Crawford County, 56.1th percentile, Relatively Low
- Jefferson County, 20.4th percentile, Very Low
- Page County, 27.5th percentile, Very Low
- Floyd County, 56.3th percentile, Relatively Low
- Hamilton County, 41th percentile, Relatively Low
- Mills County, 27.4th percentile, Very Low
- Harrison County, 37th percentile, Relatively Low
- Kossuth County, 26.7th percentile, Very Low
- O'Brien County, 18.5th percentile, Very Low
- Allamakee County, 50.5th percentile, Relatively Low
- Butler County, 37.2th percentile, Relatively Low
- Cass County, 43.4th percentile, Relatively Low
- Wright County, 35.1th percentile, Relatively Low
- Grundy County, 14.2th percentile, Very Low
- Lyon County, 19.6th percentile, Very Low
- Appanoose County, 30th percentile, Very Low
- Union County, 30.1th percentile, Very Low
- Shelby County, 19.5th percentile, Very Low
- Chickasaw County, 39.6th percentile, Relatively Low
- Cherokee County, 39.1th percentile, Relatively Low
- Guthrie County, 22th percentile, Very Low
- Mitchell County, 36.2th percentile, Relatively Low
- Louisa County, 20.9th percentile, Very Low
- Hancock County, 21.6th percentile, Very Low
- Winnebago County, 25.6th percentile, Very Low
- Montgomery County, 34.6th percentile, Very Low
- Franklin County, 14th percentile, Very Low
- Keokuk County, 29.6th percentile, Very Low
- Calhoun County, 20.6th percentile, Very Low
- Humboldt County, 18.9th percentile, Very Low
- Sac County, 17.2th percentile, Very Low
- Clarke County, 9.6th percentile, Very Low
- Howard County, 25.4th percentile, Very Low
- Davis County, 32.7th percentile, Very Low
- Emmet County, 20.4th percentile, Very Low
- Palo Alto County, 9th percentile, Very Low
- Lucas County, 22.7th percentile, Very Low
- Greene County, 12th percentile, Very Low
- Monona County, 25th percentile, Very Low
- Decatur County, 15.8th percentile, Very Low
- Adair County, 23.8th percentile, Very Low
- Monroe County, 9.1th percentile, Very Low
- Worth County, 10.7th percentile, Very Low
- Van Buren County, 40.8th percentile, Relatively Low
- Pocahontas County, 18.1th percentile, Very Low
- Ida County, 18.4th percentile, Very Low
- Wayne County, 14th percentile, Very Low
- Fremont County, 18.4th percentile, Very Low
- Osceola County, 14.9th percentile, Very Low
- Taylor County, 20.9th percentile, Very Low
- Audubon County, 19.8th percentile, Very Low
- Ringgold County, 5th percentile, Very Low
- Adams County, 11.5th percentile, Very Low