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%−196%

02Floyd County, IAIA14,901-4.6%+402%

03Winnebago County, IAIA10,251-4.0%+22%

04Louisa County, IAIA10,416-3.9%−176%

05Lee County, IAIA32,306-3.7%+127%

06Calhoun County, IAIA9,562-3.7%+8%

07Pocahontas County, IAIA6,819-3.7%−60%

08Osceola County, IAIA5,980-3.4%−6%

09Kossuth County, IAIA14,322-3.4%−56%

10Ida County, IAIA6,777-3.3%−48%

11Muscatine County, IAIA41,853-3.2%−170%

12Montgomery County, IAIA10,002-3.2%+26%

13Emmet County, IAIA9,107-3.0%−36%

14Sac County, IAIA9,525-2.9%−54%

15Audubon County, IAIA5,509-2.9%−58%

16Chickasaw County, IAIA11,663-2.9%+93%

17Union County, IAIA11,829-2.5%−26%

18Hardin County, IAIA16,455-2.5%+70%

19Cherokee County, IAIA11,369-2.5%−67%

20Hancock County, IAIA10,528-2.5%−42%

21Monona County, IAIA8,539-2.4%+1636%

22Jefferson County, IAIA15,291-2.4%+200%

23Fayette County, IAIA19,047-2.4%−413%

24Keokuk County, IAIA9,797-2.4%+22%

25Adams County, IAIA3,617-2.3%−70%

26Page County, IAIA14,856-2.3%−471%

27Monroe County, IAIA7,406-2.3%+87%

28Carroll County, IAIA20,303-2.2%+23480%

29Des Moines County, IAIA38,077-2.1%+247%

30Butler County, IAIA14,049-2.0%−27%

31Tama County, IAIA16,796-2.0%−150%

32Humboldt County, IAIA9,409-2.0%−44%

33Appanoose County, IAIA12,077-1.9%+1117%

34Buena Vista County, IAIA20,449-1.8%−180%

35Clarke County, IAIA9,574-1.8%−117%

36Cerro Gordo County, IAIA42,372-1.8%+186%

37Crawford County, IAIA16,237-1.7%−275%

38Winneshiek County, IAIA19,733-1.7%−176%

39Poweshiek County, IAIA18,368-1.6%+38%

40Franklin County, IAIA9,868-1.5%−74%

41Worth County, IAIA7,338-1.4%+37%

42Mahaska County, IAIA21,880-1.4%−137%

43Greene County, IAIA8,658-1.3%−140%

44Cass County, IAIA12,960-1.3%−57%

45Fremont County, IAIA6,522-1.3%−52%

46Adair County, IAIA7,403-1.2%−37%

47Clayton County, IAIA16,845-1.2%−41%

48Clay County, IAIA16,202-1.1%−8%

49Wright County, IAIA12,801-1.1%−341%

50Palo Alto County, IAIA8,899-1.1%−78%

51Taylor County, IAIA5,835-1.0%−53%

52Jackson County, IAIA19,288-1.0%−158%

53Van Buren County, IAIA7,131-1.0%−158%

54Clinton County, IAIA46,002-1.0%−44%

55Iowa County, IAIA16,504-0.9%−113%

56Cedar County, IAIA18,359-0.8%−117%

57Pottawattamie County, IAIA92,996-0.7%−112%

58Wapello County, IAIA35,210-0.6%−163%

59Hamilton County, IAIA14,944-0.6%−128%

60Howard County, IAIA9,415-0.6%−145%

61Marshall County, IAIA39,890-0.5%−120%

62Shelby County, IAIA11,689-0.5%+13%

63Ringgold County, IAIA4,642-0.5%−150%

64Webster County, IAIA36,838-0.4%+64%

65Plymouth County, IAIA25,697-0.0%−100%

66Dubuque County, IAIA99,381+0.1%−96%

67Decatur County, IAIA7,655+0.1%−97%

68Grundy County, IAIA12,361+0.3%−91%

69O'Brien County, IAIA14,220+0.3%−112%

70Harrison County, IAIA14,623+0.3%−96%

71Black Hawk County, IAIA131,532+0.3%−91%

72Boone County, IAIA26,799+0.3%−92%

73Scott County, IAIA175,259+0.3%−93%

74Washington County, IAIA22,667+0.5%−92%

75Woodbury County, IAIA106,649+0.7%−88%

76Linn County, IAIA232,028+0.8%−94%

77Mitchell County, IAIA10,650+0.8%−263%

78Jasper County, IAIA38,153+0.9%−87%

79Delaware County, IAIA17,674+1.1%−48%

80Bremer County, IAIA25,296+1.2%−45%

81Allamakee County, IAIA14,238+1.3%−79%

82Davis County, IAIA9,230+1.3%−52%

83Guthrie County, IAIA10,782+1.5%−61%

84Buchanan County, IAIA20,883+1.5%+29%

85Benton County, IAIA26,004+1.7%−87%

86Dickinson County, IAIA18,077+2.1%−79%

87Mills County, IAIA14,793+2.1%−79%

88Marion County, IAIA34,192+2.3%−66%

89Lucas County, IAIA8,847+2.5%−36%

90Sioux County, IAIA36,774+2.5%−55%

91Story County, IAIA101,291+2.8%−64%

92Jones County, IAIA21,253+2.9%−26%

93Lyon County, IAIA12,354+3.5%−323%

94Wayne County, IAIA6,738+3.7%−178%

95Madison County, IAIA17,270+4.4%−65%

96Johnson County, IAIA160,044+4.7%−70%

97Polk County, IAIA516,546+4.9%−66%

98Warren County, IAIA57,331+9.4%−27%

99Dallas County, IAIA118,457+18.8%−49%

SHOWING 1–99 OF 99

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES