RANKING · 2025 ESTIMATES · 99 SHOWN OF 99

Most population lost, Iowa counties

Iowa counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is -151. Biggest climber in the top 100 since 2020: Muscatine County, IA, up 80 places to #1.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲80Muscatine County, IAIA41,853-1,382−176%

02Lee County, IAIA32,306-1,249+97%

03▲73Henry County, IAIA19,349-1,133−202%

04▼1Des Moines County, IAIA38,077-833+217%

05▲2Cerro Gordo County, IAIA42,372-755+164%

06▲10Floyd County, IAIA14,901-726+359%

07▲75Pottawattamie County, IAIA92,996-671−113%

08▲7Kossuth County, IAIA14,322-506−65%

09▼5Fayette County, IAIA19,047-462−380%

10▼9Clinton County, IAIA46,002-458−49%

11▲57Carroll County, IAIA20,303-457+22750%

12▲50Winnebago County, IAIA10,251-428+7%

13▲5Hardin County, IAIA16,455-423+50%

14▲11Louisa County, IAIA10,416-421−171%

15▲68Buena Vista County, IAIA20,449-374−184%

16▼11Jefferson County, IAIA15,291-372+188%

17▲57Calhoun County, IAIA9,562-365−7%

18▼4Page County, IAIA14,856-355−435%

19▲16Chickasaw County, IAIA11,663-349+75%

20Tama County, IAIA16,796-339−150%

21▼12Winneshiek County, IAIA19,733-337−173%

22▲18Montgomery County, IAIA10,002-328+8%

23▲37Mahaska County, IAIA21,880-310−138%

24▲17Union County, IAIA11,829-309−30%

25▲30Poweshiek County, IAIA18,368-294+35%

26▲13Cherokee County, IAIA11,369-289−73%

27▲1Sac County, IAIA9,525-289−64%

28▼6Crawford County, IAIA16,237-288−272%

29Butler County, IAIA14,049-285−33%

30▼20Emmet County, IAIA9,107-281−48%

31▼5Hancock County, IAIA10,528-267−50%

32▲24Pocahontas County, IAIA6,819-259−70%

33▼10Appanoose County, IAIA12,077-240+991%

34▼2Keokuk County, IAIA9,797-236+5%

35▲32Ida County, IAIA6,777-228−57%

36▲25Wapello County, IAIA35,210-227−162%

37▼10Marshall County, IAIA39,890-215−121%

38▼7Monona County, IAIA8,539-212+1414%

39▲13Osceola County, IAIA5,980-212−20%

40▼34Clayton County, IAIA16,845-198−47%

41▲4Jackson County, IAIA19,288-197−157%

42▲15Humboldt County, IAIA9,409-188−50%

43▲7Clay County, IAIA16,202-182−15%

44▲36Clarke County, IAIA9,574-174−121%

45▼2Monroe County, IAIA7,406-171+74%

46▼34Cass County, IAIA12,960-167−62%

47▼13Audubon County, IAIA5,509-165−67%

48▼40Webster County, IAIA36,838-161+50%

49▲26Iowa County, IAIA16,504-158−115%

50▼33Franklin County, IAIA9,868-151−77%

51▲18Cedar County, IAIA18,359-146−118%

52▼3Wright County, IAIA12,801-142−318%

53▼29Greene County, IAIA8,658-113−135%

54▲10Worth County, IAIA7,338-105+28%

55▼19Palo Alto County, IAIA8,899-97−81%

56▼37Hamilton County, IAIA14,944-95−126%

57▲6Adair County, IAIA7,403-93−44%

58▼10Adams County, IAIA3,617-87−77%

59▼48Fremont County, IAIA6,522-83−62%

60▼16Van Buren County, IAIA7,131-72−154%

61▼24Taylor County, IAIA5,835-61−61%

62▼24Shelby County, IAIA11,689-570%

63▲3Howard County, IAIA9,415-54−144%

64▼31Ringgold County, IAIA4,642-21−143%

65▲20Plymouth County, IAIA25,697-1−100%

66▼53Decatur County, IAIA7,655+10−97%

67▼2Grundy County, IAIA12,361+32−91%

68▼10O'Brien County, IAIA14,220+38−111%

69▼23Harrison County, IAIA14,623+41−96%

70▲9Boone County, IAIA26,799+84−92%

71▼12Mitchell County, IAIA10,650+85−257%

72▲14Washington County, IAIA22,667+102−90%

73▲19Dubuque County, IAIA99,381+115−96%

74▲4Davis County, IAIA9,230+120−48%

75▼28Guthrie County, IAIA10,782+159−62%

76▼23Allamakee County, IAIA14,238+177−78%

77▼26Delaware County, IAIA17,674+186−50%

78▼24Lucas County, IAIA8,847+213−39%

79▼7Wayne County, IAIA6,738+241−172%

80▲4Bremer County, IAIA25,296+308−40%

81▼60Mills County, IAIA14,793+309−77%

82▼40Buchanan County, IAIA20,883+318+28%

83▲5Jasper County, IAIA38,153+340−86%

84▲5Dickinson County, IAIA18,077+374−75%

85▼14Black Hawk County, IAIA131,532+388−91%

86▼9Lyon County, IAIA12,354+420−322%

87▼57Benton County, IAIA26,004+429−85%

88▲7Scott County, IAIA175,259+590−92%

89▼19Jones County, IAIA21,253+607−22%

90▲1Woodbury County, IAIA106,649+708−87%

91▼4Madison County, IAIA17,270+722−53%

92▼19Marion County, IAIA34,192+778−62%

93▼3Sioux County, IAIA36,774+902−47%

94▲2Linn County, IAIA232,028+1,729−92%

95▼1Story County, IAIA101,291+2,754−52%

96▼3Warren County, IAIA57,331+4,928+6%

97Johnson County, IAIA160,044+7,190−52%

98Dallas County, IAIA118,457+18,779+71%

99Polk County, IAIA516,546+24,145−49%

SHOWING 1–99 OF 99

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES