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Flood data for Iowa

Published NFIP policy and loss records, alongside a way to check the map.

Average annual premium and federal policy fee per policy unit

$1,365

As of 2026-08-31. A portfolio average, not a quote for a home.

Policies in force, including condo units
9,058
Cumulative recorded losses
14,788
Net dollars paid
$357,594,327

Cumulative losses in the HUDEX report through August 31, 2026. Loss counts include claims closed without payment. No annual series or first loss year is stated in this report.

Find a flood zone in Iowa.

U.S. addresses only. Include a ZIP for a more precise match.

County policy and loss records

Iowa NFIP records as of 2026-08-31
CountyPremium + fee / unitPolicy unitsRecorded losses
Polk County$1,1751,1281,550
Linn County$1,2581,0981,352
Scott County$1,6536872,308
Pottawattamie County$1,109662871
Johnson County$2,051599448
Black Hawk County$9935711,477
Woodbury County$1,675235293
Harrison County$774216192
Des Moines County$1,391184356
Sioux County$2,17217243
Clay County$2,14516078
Muscatine County$1,473153359
Clinton County$1,057151173
Story County$1,582148284
Butler County$1,219128315
Bremer County$1,307126638
Louisa County$1,076125122
Iowa County$68611436
Clayton County$1,557107215
Washington County$1,01410514
Floyd County$1,20497264
Montgomery County$8599583
Cerro Gordo County$1,38493217
Dallas County$9229342
Dubuque County$1,43793254
Fremont County$1,38185234
Delaware County$1,48484104
Benton County$1,43180108
Buchanan County$1,29076378
Winneshiek County$1,5337528
Lee County$2,30671144
Mills County$1,90170129
Jones County$1,28557122
Cherokee County$1,63047140
Fayette County$1,5824794
Lyon County$1,8464775
Tama County$82944148
Monona County$1,0044331
Chickasaw County$1,3834142
Cedar County$1,9174039
Van Buren County$1,6114052
Jasper County$1,4543544
Boone County$1,5683418
Wapello County$2,29434119
Allamakee County$1,2463317
Dickinson County$1,5483315
Warren County$7963221
Jackson County$1,3093143
Plymouth County$1,1473028
Shelby County$1,5633015
Hardin County$1,3132915
Marshall County$9362830
Cass County$1,0292657
Webster County$1,3422495
Buena Vista County$1,082231
Howard County$719228
Pocahontas County$765210
Carroll County$7921913
Crawford County$2,8271891
Guthrie County$1,1771810
Palo Alto County$1,094184
Wright County$1,203182
Humboldt County$1,7351639
Mahaska County$1,0731510
Osceola County$2,098152
Union County$9611414
Emmet County$2,3581219
Mitchell County$1,2271225
Franklin County$927102
Poweshiek County$1,046100
Ida County$1,27198
Marion County$918921
Hamilton County$1,534829
Hancock County$1,25573
Madison County$87377
Page County$73273
Adams County$2,78866
Appanoose County$1,82868
Kossuth County$1,63562
Jefferson County$2,01750
Keokuk County$69452
O'Brien County$2,10954
Worth County$81555
Audubon County$1,403414
Grundy County$817413
Sac County$96042
Calhoun County$51830
Greene County$67624
Lucas County$2,28324
Henry County$31811
Winnebago County$1,14912
Decatur CountyNot available07
Monroe CountyNot available01
Taylor CountyNot available06

State policy mix by rated zone group

These are insured policy units grouped by their rated zones, not a percentage of the state’s land or homes.

NFIP rated zone groups, 2026-08-31
Rated groupPolicy unitsShare of insured units
All A zones combined5,80864.1%
Unknown or invalid rated zone340.4%
X, B and C zones combined3,21635.5%

Largest recorded loss years

Published net claim payments from 1978 through 2026, grouped by year of loss. Dollar amounts are nominal. The 2026-09-08 OpenFEMA claims release is a separate population from the policy workbook above.

2008$168,910,8632019$27,043,4351993$26,182,6042010$19,629,0182024$14,319,083
All published years and net payments
Iowa claims history
Year of lossNet payments
1978$178,842
1979$646,941
1980$165,820
1981$29,216
1982$444,961
1983$166,153
1984$401,800
1985$57,475
1986$706,235
1987$202,662
1989$4,803
1990$8,372,431
1991$678,821
1992$27,685
1993$26,182,604
1994$40,567
1995$5,598
1996$2,399,614
1997$1,203,138
1998$1,622,090
1999$8,005,899
2000$275,099
2001$6,137,105
2002$1,041,865
2003$12,317
2004$2,915,626
2005$22,402
2006$10,733
2007$3,992,593
2008$168,910,863
2009$1,732,154
2010$19,629,018
2011$12,587,558
2012$31,773
2013$4,159,539
2014$10,066,461
2015$3,124,071
2016$11,468,150
2017$1,663,718
2018$12,389,775
2019$27,043,435
2020$316,394
2021$336,647
2022$712
2023$1,259,705
2024$14,319,083
2025$818,064
2026$1,898,809

Records without payment are included in counts. Missing county records are retained in national controls and are not allocated to counties. OpenFEMA NFIP redacted claims V3.

Data and methodology

Complete official HUDEX report, summed across its community rows within each geocoded county FIPS. Policy Count includes condominium units under master policies. Average premium is Total Premium + Federal Policy Fee divided by Policy Count; this is an aggregate per policy unit, not a property quote. Loss counts include losses closed without payment. Total Net Dollars Paid is cumulative in this report, including the source's adjustments. The report does not specify the first loss year or split losses by year, so a starting year and annual breakdown are not inferred. Unassigned county records are retained in state totals separately. No record sampling.

Official NFIP policy and loss geography workbook

Read the full methodology and coverage limits