RANKING · 2020 CENSUS · 99 SHOWN OF 99

Fastest shrinking, Iowa counties · 2020

Iowa counties with the steepest population decline from the 2010 census to 2020. 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

01Fremont County, IAIA6,522-11.2%−8.6 pts

02Decatur County, IAIA7,655-9.6%−13.8 pts

03Ringgold County, IAIA4,642-9.1%−10.0 pts

04Emmet County, IAIA9,107-8.9%−4.2 pts

05Adams County, IAIA3,617-8.1%−0.2 pts

06Audubon County, IAIA5,509-7.3%−0.4 pts

07Jefferson County, IAIA15,291-7.0%−6.2 pts

08Taylor County, IAIA5,835-6.7%−4.5 pts

09Fayette County, IAIA19,047-6.6%−7.3 pts

10Lee County, IAIA32,306-6.4%−4.8 pts

11Franklin County, IAIA9,868-6.2%−0.4 pts

12Greene County, IAIA8,658-6.1%−9.2 pts

13Clayton County, IAIA16,845-6.0%−4.0 pts

14Cass County, IAIA12,960-5.9%−3.0 pts

15Clinton County, IAIA46,002-5.4%−3.7 pts

16Monona County, IAIA8,539-5.3%−5.2 pts

17Sac County, IAIA9,525-5.2%+1.3 pts

18Monroe County, IAIA7,406-4.9%−3.7 pts

19Van Buren County, IAIA7,131-4.8%−6.6 pts

20Louisa County, IAIA10,416-4.8%−9.9 pts

21Hancock County, IAIA10,528-4.8%−0.6 pts

22Winneshiek County, IAIA19,733-4.7%−6.9 pts

23Kossuth County, IAIA14,322-4.6%+3.1 pts

24Keokuk County, IAIA9,797-4.5%−2.6 pts

25Page County, IAIA14,856-4.5%−5.2 pts

26Palo Alto County, IAIA8,899-4.5%+0.4 pts

27Appanoose County, IAIA12,077-4.4%−4.3 pts

28Osceola County, IAIA5,980-4.2%−0.5 pts

29Floyd County, IAIA14,901-4.1%−3.2 pts

30Hamilton County, IAIA14,944-4.0%−6.3 pts

31Mills County, IAIA14,793-3.8%−14.0 pts

32Montgomery County, IAIA10,002-3.8%−1.3 pts

33Hardin County, IAIA16,455-3.7%−2.3 pts

34Butler County, IAIA14,049-3.6%−0.9 pts

35Tama County, IAIA16,796-3.6%−7.5 pts

36Des Moines County, IAIA38,077-3.5%−2.9 pts

37Shelby County, IAIA11,689-3.5%−3.0 pts

38Chickasaw County, IAIA11,663-3.4%−1.9 pts

39Cherokee County, IAIA11,369-3.4%+4.1 pts

40Crawford County, IAIA16,237-3.3%−4.3 pts

41Pocahontas County, IAIA6,819-3.2%+5.9 pts

42Union County, IAIA11,829-3.2%+0.3 pts

43Guthrie County, IAIA10,782-3.0%−6.8 pts

44Lucas County, IAIA8,847-3.0%−6.8 pts

45Webster County, IAIA36,838-2.7%−2.4 pts

46Adair County, IAIA7,403-2.4%−0.4 pts

47Cerro Gordo County, IAIA42,372-2.3%−1.7 pts

48Harrison County, IAIA14,623-2.3%−8.7 pts

49Humboldt County, IAIA9,409-2.2%+1.3 pts

50Wright County, IAIA12,801-2.2%−2.6 pts

51Worth County, IAIA7,338-2.0%−1.0 pts

52Mitchell County, IAIA10,650-2.0%−1.5 pts

53Benton County, IAIA26,004-1.9%−14.8 pts

54Allamakee County, IAIA14,238-1.9%−7.8 pts

55Buchanan County, IAIA20,883-1.9%−3.1 pts

56Jackson County, IAIA19,288-1.8%−3.6 pts

57Winnebago County, IAIA10,251-1.7%+1.6 pts

58Clay County, IAIA16,202-1.7%−0.5 pts

59Delaware County, IAIA17,674-1.6%−3.6 pts

60O'Brien County, IAIA14,220-1.5%+0.7 pts

61Marshall County, IAIA39,890-1.3%−4.0 pts

62Poweshiek County, IAIA18,368-1.3%−0.2 pts

63Ida County, IAIA6,777-1.2%+5.1 pts

64Howard County, IAIA9,415-1.0%−2.3 pts

65Grundy County, IAIA12,361-1.0%−3.8 pts

66Mahaska County, IAIA21,880-0.9%−4.6 pts

67Wapello County, IAIA35,210-0.5%−1.5 pts

68Carroll County, IAIA20,303-0.3%−0.3 pts

69Cedar County, IAIA18,359+0.0%−4.6 pts

70Jones County, IAIA21,253+0.0%−4.0 pts

71Black Hawk County, IAIA131,532+0.0%−3.4 pts

72Marion County, IAIA34,192+0.3%−6.5 pts

73Pottawattamie County, IAIA92,996+0.5%−5.6 pts

74Muscatine County, IAIA41,853+1.1%−3.4 pts

75Wayne County, IAIA6,738+1.5%+6.2 pts

76Boone County, IAIA26,799+1.6%−2.6 pts

77Henry County, IAIA19,349+1.7%−4.1 pts

78Iowa County, IAIA16,504+1.9%−5.2 pts

79Jasper County, IAIA38,153+2.6%−4.3 pts

80Calhoun County, IAIA9,562+2.7%+6.1 pts

81Buena Vista County, IAIA20,449+2.8%+0.5 pts

82Plymouth County, IAIA25,697+2.8%−3.4 pts

83Bremer County, IAIA25,296+2.9%+0.7 pts

84Lyon County, IAIA12,354+3.0%+4.6 pts

85Woodbury County, IAIA106,649+3.7%−2.0 pts

86Washington County, IAIA22,667+4.0%−1.4 pts

87Davis County, IAIA9,230+4.1%+1.3 pts

88Clarke County, IAIA9,574+5.0%−5.2 pts

89Madison County, IAIA17,270+5.5%−6.8 pts

90Scott County, IAIA175,259+5.7%+0.6 pts

91Dubuque County, IAIA99,381+6.0%+2.8 pts

92Dickinson County, IAIA18,077+6.2%−3.9 pts

93Sioux County, IAIA36,774+6.4%+0.8 pts

94Linn County, IAIA232,028+9.0%−4.6 pts

95Story County, IAIA101,291+10.0%+2.3 pts

96Warren County, IAIA57,331+13.4%+0.5 pts

97Polk County, IAIA516,546+14.3%−0.2 pts

98Johnson County, IAIA160,044+16.8%+1.3 pts

99Dallas County, IAIA118,457+50.7%+13.8 pts

SHOWING 1–99 OF 99

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS