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Flood history in Iowa

Iowa has 720 county-level flood declarations across 99 counties. Clayton County leads with 14 declarations. Total tracked FEMA obligations for flood events in this state: $267.0M.

This page shows every Iowa county in Iowa that has at least one FEMA flood declaration on record, ranked by how many times that hazard type triggered federal aid. Counties near the top of this list have recurring exposure to flood events — useful context for anyone evaluating property risk, insurance needs, or emergency planning in the area.

For the full national view of flood declarations across all states, see the flood disaster type page. For all hazard types in Iowa, see the Iowa state page.

Flood in Iowa

Counties ranked by flood declaration count

#CountyDeclarationsTracked aid
1Clayton County14$1.2M
2Des Moines County13$3.8M
3Allamakee County12$2.4M
4Clinton County12$2.4M
5Johnson County12$717K
6Buchanan County11$959K
7Butler County11$1.8M
8Linn County11$9.0M
9Louisa County11$934K
10Scott County11$6.4M
11Dubuque County10$1.6M
12Fayette County10$6.2M
13Franklin County10$1.0M
14Muscatine County10$1.9M
15Tama County10$388K
16Black Hawk County9$1.7M
17Fremont County9$25.8M
18Harrison County9$24.9M
19Iowa County9$492K
20Lee County9$4.8M
21Marion County9$67K
22Marshall County9$40K
23Wapello County9$2.2M
24Winneshiek County9$3.3M
25Benton County8$242K
26Bremer County8$813K
27Chickasaw County8$1.8M
28Crawford County8$1.1M
29Delaware County8$317K
30Emmet County8$1.0M
31Floyd County8$824K
32Howard County8$1.0M
33Jackson County8$742K
34Jones County8$874K
35Keokuk County8$415K
36Madison County8$203K
37Polk County8$13.1M
38Ringgold County8$850K
39Wright County8$756K
40Audubon County7$250K
41Buena Vista County7$4.0M
42Carroll County7$218K
43Cass County7$204K
44Cedar County7$150K
45Clay County7$1.6M
46Dickinson County7$406K
47Greene County7$821K
48Hamilton County7$841K
49Kossuth County7$2.5M
50Mahaska County7$120K
51Mills County7$31.7M
52Monona County7$4.3M
53Monroe County7$280K
54Palo Alto County7$1.1M
55Pottawattamie County7$32.9M
56Webster County7$5.4M
57Woodbury County7$21.0M
58Cerro Gordo County6$296K
59Cherokee County6$4.1M
60Clarke County6$0
61Dallas County6$335K
62Davis County6$463K
63Decatur County6$247K
64Hardin County6$2.0M
65Henry County6$784K
66Humboldt County6$2.9M
67Ida County6$1.1M
68Jasper County6$700K
69Jefferson County6$0
70Lucas County6$476K
71Lyon County6$5.7M
72Mitchell County6$409K
73Montgomery County6$237K
74Osceola County6$487K
75Page County6$363K
76Plymouth County6$1.6M
77Pocahontas County6$370K
78Shelby County6$514K
79Story County6$0
80Union County6$1.1M
81Van Buren County6$98K
82Warren County6$6K
83Adams County5$355K
84Appanoose County5$287K
85Boone County5$168K
86Hancock County5$485K
87Sac County5$282K
88Sioux County5$3.0M
89Wayne County5$841K
90Winnebago County5$663K
91Worth County5$0
92Adair County4$136K
93Calhoun County4$0
94Grundy County4$0
95Guthrie County4$833K
96O'Brien County4$256K
97Poweshiek County4$0
98Washington County4$0
99Taylor County2$0