RANKING · 2025 ESTIMATES · 99 SHOWN OF 99

Fastest shrinking, Iowa counties

Iowa counties with the steepest population decline from the 2020 census to 2025. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is -1.1%. Biggest climber in the top 100 since 2020: Henry County, IA, up 76 places to #1.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲76Henry County, IAIA19,349-5.5%−11.3 pts

02▲27Floyd County, IAIA14,901-4.6%−3.7 pts

03▲54Winnebago County, IAIA10,251-4.0%−0.7 pts

04▲16Louisa County, IAIA10,416-3.9%−9.0 pts

05▲5Lee County, IAIA32,306-3.7%−2.1 pts

06▲74Calhoun County, IAIA9,562-3.7%−0.3 pts

07▲34Pocahontas County, IAIA6,819-3.7%+5.4 pts

08▲20Osceola County, IAIA5,980-3.4%+0.2 pts

09▲14Kossuth County, IAIA14,322-3.4%+4.3 pts

10▲53Ida County, IAIA6,777-3.3%+3.1 pts

11▲63Muscatine County, IAIA41,853-3.2%−7.7 pts

12▲20Montgomery County, IAIA10,002-3.2%−0.6 pts

13▼9Emmet County, IAIA9,107-3.0%+1.7 pts

14▲3Sac County, IAIA9,525-2.9%+3.5 pts

15▼9Audubon County, IAIA5,509-2.9%+4.0 pts

16▲22Chickasaw County, IAIA11,663-2.9%−1.4 pts

17▲25Union County, IAIA11,829-2.5%+0.9 pts

18▲15Hardin County, IAIA16,455-2.5%−1.0 pts

19▲20Cherokee County, IAIA11,369-2.5%+5.1 pts

20▲1Hancock County, IAIA10,528-2.5%+1.8 pts

21▼5Monona County, IAIA8,539-2.4%−2.3 pts

22▼15Jefferson County, IAIA15,291-2.4%−1.6 pts

23▼14Fayette County, IAIA19,047-2.4%−3.1 pts

24Keokuk County, IAIA9,797-2.4%−0.4 pts

25▼20Adams County, IAIA3,617-2.3%+5.5 pts

26▼1Page County, IAIA14,856-2.3%−3.0 pts

27▼9Monroe County, IAIA7,406-2.3%−1.0 pts

28▲40Carroll County, IAIA20,303-2.2%−2.2 pts

29▲7Des Moines County, IAIA38,077-2.1%−1.5 pts

30▲4Butler County, IAIA14,049-2.0%+0.7 pts

31▲4Tama County, IAIA16,796-2.0%−5.9 pts

32▲17Humboldt County, IAIA9,409-2.0%+1.5 pts

33▼6Appanoose County, IAIA12,077-1.9%−1.8 pts

34▲47Buena Vista County, IAIA20,449-1.8%−4.0 pts

35▲53Clarke County, IAIA9,574-1.8%−12.0 pts

36▲11Cerro Gordo County, IAIA42,372-1.8%−1.1 pts

37▲3Crawford County, IAIA16,237-1.7%−2.7 pts

38▼16Winneshiek County, IAIA19,733-1.7%−3.9 pts

39▲23Poweshiek County, IAIA18,368-1.6%−0.4 pts

40▼29Franklin County, IAIA9,868-1.5%+4.3 pts

41▲10Worth County, IAIA7,338-1.4%−0.4 pts

42▲24Mahaska County, IAIA21,880-1.4%−5.2 pts

43▼31Greene County, IAIA8,658-1.3%−4.5 pts

44▼30Cass County, IAIA12,960-1.3%+1.7 pts

45▼44Fremont County, IAIA6,522-1.3%+1.4 pts

46Adair County, IAIA7,403-1.2%+0.7 pts

47▼34Clayton County, IAIA16,845-1.2%+0.8 pts

48▲10Clay County, IAIA16,202-1.1%+0.1 pts

49▲1Wright County, IAIA12,801-1.1%−1.6 pts

50▼24Palo Alto County, IAIA8,899-1.1%+3.8 pts

51▼43Taylor County, IAIA5,835-1.0%+1.2 pts

52▲4Jackson County, IAIA19,288-1.0%−2.7 pts

53▼34Van Buren County, IAIA7,131-1.0%−2.7 pts

54▼39Clinton County, IAIA46,002-1.0%+0.8 pts

55▲23Iowa County, IAIA16,504-0.9%−8.1 pts

56▲13Cedar County, IAIA18,359-0.8%−5.4 pts

57▲16Pottawattamie County, IAIA92,996-0.7%−6.9 pts

58▲9Wapello County, IAIA35,210-0.6%−1.7 pts

59▼29Hamilton County, IAIA14,944-0.6%−2.9 pts

60▲4Howard County, IAIA9,415-0.6%−1.8 pts

61Marshall County, IAIA39,890-0.5%−3.2 pts

62▼25Shelby County, IAIA11,689-0.5%−0.1 pts

63▼60Ringgold County, IAIA4,642-0.5%−1.4 pts

64▼19Webster County, IAIA36,838-0.4%−0.2 pts

65▲17Plymouth County, IAIA25,697-0.0%−6.3 pts

66▲25Dubuque County, IAIA99,381+0.1%−3.1 pts

67▼65Decatur County, IAIA7,655+0.1%−4.1 pts

68▼3Grundy County, IAIA12,361+0.3%−2.6 pts

69▼9O'Brien County, IAIA14,220+0.3%+2.5 pts

70▼22Harrison County, IAIA14,623+0.3%−6.1 pts

71Black Hawk County, IAIA131,532+0.3%−3.1 pts

72▲4Boone County, IAIA26,799+0.3%−3.8 pts

73▲17Scott County, IAIA175,259+0.3%−4.8 pts

74▲12Washington County, IAIA22,667+0.5%−4.9 pts

75▲10Woodbury County, IAIA106,649+0.7%−5.0 pts

76▲18Linn County, IAIA232,028+0.8%−12.8 pts

77▼25Mitchell County, IAIA10,650+0.8%+1.3 pts

78▲1Jasper County, IAIA38,153+0.9%−6.1 pts

79▼20Delaware County, IAIA17,674+1.1%−1.0 pts

80▲3Bremer County, IAIA25,296+1.2%−1.0 pts

81▼27Allamakee County, IAIA14,238+1.3%−4.7 pts

82▲5Davis County, IAIA9,230+1.3%−1.4 pts

83▼40Guthrie County, IAIA10,782+1.5%−2.3 pts

84▼29Buchanan County, IAIA20,883+1.5%+0.4 pts

85▼32Benton County, IAIA26,004+1.7%−11.2 pts

86▲6Dickinson County, IAIA18,077+2.1%−8.0 pts

87▼56Mills County, IAIA14,793+2.1%−8.1 pts

88▼16Marion County, IAIA34,192+2.3%−4.5 pts

89▼45Lucas County, IAIA8,847+2.5%−1.4 pts

90▲3Sioux County, IAIA36,774+2.5%−3.1 pts

91▲4Story County, IAIA101,291+2.8%−4.9 pts

92▼22Jones County, IAIA21,253+2.9%−1.1 pts

93▼9Lyon County, IAIA12,354+3.5%+5.1 pts

94▼19Wayne County, IAIA6,738+3.7%+8.5 pts

95▼6Madison County, IAIA17,270+4.4%−7.9 pts

96▲2Johnson County, IAIA160,044+4.7%−10.8 pts

97Polk County, IAIA516,546+4.9%−9.6 pts

98▼2Warren County, IAIA57,331+9.4%−3.5 pts

99Dallas County, IAIA118,457+18.8%−18.1 pts

SHOWING 1–99 OF 99

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