Annual Estimates of the Total Population for Counties

Source: U.S. Census Bureau
Units: Number of residents, as of July 1st each year unless otherwise noted
Additional data: Download all data for the current decade in Excel
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FipsAreaEstimates Base (4/1/2010)20182019
19000State of Iowa3,046,8713,148,6183,155,070
19001Adair County7,6827,0747,152
19003Adams County4,0293,6443,602
19005Allamakee County14,32813,85213,687
19007Appanoose County12,88712,40112,426
19009Audubon County6,1195,4715,496
19011Benton County26,06925,62525,645
19013Black Hawk County131,086131,723131,228
19015Boone County26,30826,31226,234
19017Bremer County24,28024,94125,062
19019Buchanan County20,95321,17821,175
19021Buena Vista County20,26519,82619,620
19023Butler County14,86914,52514,439
19025Calhoun County10,1779,7119,668
19027Carroll County20,81620,15320,165
19029Cass County13,95212,94812,836
19031Cedar County18,44118,56418,627
19033Cerro Gordo County44,15342,64242,450
19035Cherokee County12,06711,29511,235
19037Chickasaw County12,44211,95211,933
19039Clarke County9,2869,5029,395
19041Clay County16,66716,10616,016
19043Clayton County18,12817,54017,549
19045Clinton County49,11746,43746,429
19047Crawford County17,09617,08916,820
19049Dallas County66,13989,95393,453
19051Davis County8,7538,9729,000
19053Decatur County8,4567,8907,870
19055Delaware County17,77017,08117,011
19057Des Moines County40,32539,14938,967
19059Dickinson County16,66717,12117,258
19061Dubuque County93,64396,92297,311
19063Emmet County10,3029,2779,208
19065Fayette County20,88219,67919,650
19067Floyd County16,29315,75215,642
19069Franklin County10,68010,08510,070
19071Fremont County7,4386,9816,960
19073Greene County9,3378,9658,888
19075Grundy County12,45312,27212,232
19077Guthrie County10,95510,72010,689
19079Hamilton County15,67514,88614,773
19081Hancock County11,33810,71010,630
19083Hardin County17,53416,93716,846
19085Harrison County14,93714,10514,049
19087Henry County20,14520,03319,954
19089Howard County9,5649,1729,158
19091Humboldt County9,8149,5599,558
19093Ida County7,0896,8466,860
19095Iowa County16,35616,15516,184
19097Jackson County19,85319,42719,439
19099Jasper County36,84237,18937,185
19101Jefferson County16,84018,25618,295
19103Johnson County130,882150,549151,140
19105Jones County20,63620,67320,681
19107Keokuk County10,51010,21310,246
19109Kossuth County15,54514,87814,813
19111Lee County35,86233,90933,657
19113Linn County211,243225,763226,706
19115Louisa County11,38711,15311,035
19117Lucas County8,9008,6178,600
19119Lyon County11,58111,81511,755
19121Madison County15,68116,20616,338
19123Mahaska County22,38222,01822,095
19125Marion County33,30733,25933,253
19127Marshall County40,64839,88839,369
19129Mills County15,05915,06815,109
19131Mitchell County10,77610,57110,586
19133Monona County9,2428,6598,615
19135Monroe County7,9727,7687,707
19137Montgomery County10,7409,9619,917
19139Muscatine County42,80342,87442,664
19141O'Brien County14,39813,79813,753
19143Osceola County6,4626,0285,958
19145Page County15,94615,22915,107
19147Palo Alto County9,4218,9038,886
19149Plymouth County24,98425,02425,177
19151Pocahontas County7,3106,7146,619
19153Polk County430,631485,833490,161
19155Pottawattamie County93,14993,26493,206
19157Poweshiek County18,91518,46718,504
19159Ringgold County5,1304,9404,894
19161Sac County10,3509,7059,721
19163Scott County165,223172,803172,943
19165Shelby County12,16911,55911,454
19167Sioux County33,70434,80234,855
19169Story County89,54296,78197,117
19171Tama County17,76716,86916,854
19173Taylor County6,3176,1606,121
19175Union County12,53412,29812,241
19177Van Buren County7,5717,0137,044
19179Wapello County35,62434,99134,969
19181Warren County46,22651,01451,466
19183Washington County21,70422,05821,965
19185Wayne County6,4036,4056,441
19187Webster County38,01136,33935,904
19189Winnebago County10,87410,53910,354
19191Winneshiek County21,05820,01719,991
19193Woodbury County102,175102,515103,107
19195Worth County7,5917,4137,381
19197Wright County13,22912,69012,562

Notes:

  • The resident population includes all persons who are "usually resident" in a specified geographic area.  It excludes U.S. Armed Forces overseas and civilian U.S. citizens whose usual place of residence is outside the United States.
  • The April 1, 2010 estimates base may differ from the 2010 Census count due to legal boundary updates, Count Question Resolution actions or other changes.
  • The annual estimates are subject to backward revision with each new data release.
  • Last Census Bureau update:  March, 2020