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.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

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

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

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

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

05Lee County, IAIA32,306-3.7%−2.1 pts

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

98Warren 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 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES