RANKING · 2000 CENSUS · 99 SHOWN OF 99

Fastest shrinking, Iowa counties · 2000

Iowa counties with the steepest population decline from the 1990 census to 2000. 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 –

01Pocahontas County, IAIA6,819-9.1%–

02Adams County, IAIA3,617-7.9%–

03Kossuth County, IAIA14,322-7.7%–

04Cherokee County, IAIA11,369-7.5%–

05Audubon County, IAIA5,509-6.9%–

06Sac County, IAIA9,525-6.5%–

07Ida County, IAIA6,777-6.3%–

08Franklin County, IAIA9,868-5.8%–

09Palo Alto County, IAIA8,899-4.9%–

10Wayne County, IAIA6,738-4.8%–

11Emmet County, IAIA9,107-4.7%–

12Hancock County, IAIA10,528-4.3%–

13Osceola County, IAIA5,980-3.6%–

14Humboldt County, IAIA9,409-3.5%–

15Union County, IAIA11,829-3.5%–

16Calhoun County, IAIA9,562-3.4%–

17Winnebago County, IAIA10,251-3.3%–

18Cass County, IAIA12,960-2.9%–

19Butler County, IAIA14,049-2.7%–

20Fremont County, IAIA6,522-2.6%–

21Montgomery County, IAIA10,002-2.5%–

22O'Brien County, IAIA14,220-2.2%–

23Taylor County, IAIA5,835-2.2%–

24Adair County, IAIA7,403-2.0%–

25Clayton County, IAIA16,845-2.0%–

26Keokuk County, IAIA9,797-1.9%–

27Clinton County, IAIA46,002-1.7%–

28Lee County, IAIA32,306-1.6%–

29Lyon County, IAIA12,354-1.6%–

30Chickasaw County, IAIA11,663-1.5%–

31Hardin County, IAIA16,455-1.5%–

32Clay County, IAIA16,202-1.2%–

33Monroe County, IAIA7,406-1.2%–

34Poweshiek County, IAIA18,368-1.1%–

35Worth County, IAIA7,338-1.0%–

36Floyd County, IAIA14,901-0.9%–

37Jefferson County, IAIA15,291-0.8%–

38Des Moines County, IAIA38,077-0.6%–

39Cerro Gordo County, IAIA42,372-0.6%–

40Mitchell County, IAIA10,650-0.5%–

41Shelby County, IAIA11,689-0.4%–

42Webster County, IAIA36,838-0.3%–

43Appanoose County, IAIA12,077-0.2%–

44Monona County, IAIA8,539-0.1%–

45Carroll County, IAIA20,303-0.0%–

46Wright County, IAIA12,801+0.5%–

47Page County, IAIA14,856+0.6%–

48Fayette County, IAIA19,047+0.8%–

49Ringgold County, IAIA4,642+0.9%–

50Crawford County, IAIA16,237+1.0%–

51Wapello County, IAIA35,210+1.0%–

52Buchanan County, IAIA20,883+1.2%–

53Howard County, IAIA9,415+1.3%–

54Van Buren County, IAIA7,131+1.7%–

55Jackson County, IAIA19,288+1.7%–

56Delaware County, IAIA17,674+2.0%–

57Winneshiek County, IAIA19,733+2.2%–

58Buena Vista County, IAIA20,449+2.2%–

59Bremer County, IAIA25,296+2.2%–

60Hamilton County, IAIA14,944+2.3%–

61Marshall County, IAIA39,890+2.7%–

62Davis County, IAIA9,230+2.8%–

63Grundy County, IAIA12,361+2.8%–

64Dubuque County, IAIA99,381+3.2%–

65Greene County, IAIA8,658+3.2%–

66Black Hawk County, IAIA131,532+3.4%–

67Mahaska County, IAIA21,880+3.8%–

68Guthrie County, IAIA10,782+3.8%–

69Lucas County, IAIA8,847+3.9%–

70Tama County, IAIA16,796+3.9%–

71Jones County, IAIA21,253+4.0%–

72Boone County, IAIA26,799+4.1%–

73Decatur County, IAIA7,655+4.2%–

74Muscatine County, IAIA41,853+4.5%–

75Cedar County, IAIA18,359+4.6%–

76Scott County, IAIA175,259+5.1%–

77Louisa County, IAIA10,416+5.1%–

78Washington County, IAIA22,667+5.4%–

79Sioux County, IAIA36,774+5.6%–

80Woodbury County, IAIA106,649+5.7%–

81Henry County, IAIA19,349+5.8%–

82Allamakee County, IAIA14,238+5.9%–

83Pottawattamie County, IAIA92,996+6.1%–

84Plymouth County, IAIA25,697+6.2%–

85Harrison County, IAIA14,623+6.4%–

86Marion County, IAIA34,192+6.8%–

87Jasper County, IAIA38,153+6.9%–

88Iowa County, IAIA16,504+7.1%–

89Story County, IAIA101,291+7.7%–

90Dickinson County, IAIA18,077+10.2%–

91Mills County, IAIA14,793+10.2%–

92Clarke County, IAIA9,574+10.2%–

93Madison County, IAIA17,270+12.3%–

94Benton County, IAIA26,004+12.8%–

95Warren County, IAIA57,331+12.9%–

96Linn County, IAIA232,028+13.6%–

97Polk County, IAIA516,546+14.5%–

98Johnson County, IAIA160,044+15.5%–

99Dallas County, IAIA118,457+37.0%–

SHOWING 1–99 OF 99

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS