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