RANKING · 2010 CENSUS · 99 SHOWN OF 99

Fastest shrinking, Iowa counties · 2010

Iowa counties with the steepest population decline since the prior decennial census. 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 densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Pocahontas County, IAIA6,819-15.6%+72%

02Calhoun County, IAIA9,562-13.0%+281%

03Audubon County, IAIA5,509-10.4%+51%

04Sac County, IAIA9,525-10.2%+59%

05Adams County, IAIA3,617-10.1%+28%

06Greene County, IAIA8,658-9.9%−411%

07Ida County, IAIA6,777-9.5%+51%

08Kossuth County, IAIA14,322-9.4%+23%

09Taylor County, IAIA5,835-9.2%+320%

10Montgomery County, IAIA10,002-8.8%+247%

11Keokuk County, IAIA9,797-7.8%+305%

12Monona County, IAIA8,539-7.8%+5458%

13Osceola County, IAIA5,980-7.7%+113%

14Wright County, IAIA12,801-7.7%−1792%

15Shelby County, IAIA11,689-7.6%+1673%

16Cherokee County, IAIA11,369-7.4%−2%

17Winnebago County, IAIA10,251-7.3%+122%

18Palo Alto County, IAIA8,899-7.2%+46%

19Fremont County, IAIA6,522-7.1%+171%

20Adair County, IAIA7,403-6.8%+245%

21Hardin County, IAIA16,455-6.8%+360%

22Emmet County, IAIA9,107-6.6%+40%

23Louisa County, IAIA10,416-6.5%−228%

24Hancock County, IAIA10,528-6.3%+47%

25Ringgold County, IAIA4,642-6.2%−784%

26Page County, IAIA14,856-6.1%−1079%

27Appanoose County, IAIA12,077-6.1%+3697%

28Lee County, IAIA32,306-5.8%+251%

29Lucas County, IAIA8,847-5.6%−243%

30Webster County, IAIA36,838-5.5%+1982%

31Humboldt County, IAIA9,409-5.5%+56%

32Fayette County, IAIA19,047-5.1%−779%

33Chickasaw County, IAIA11,663-5.0%+233%

34Cass County, IAIA12,960-5.0%+69%

35Cerro Gordo County, IAIA42,372-4.9%+708%

36Wayne County, IAIA6,738-4.9%+2%

37Des Moines County, IAIA38,077-4.8%+675%

38Harrison County, IAIA14,623-4.7%−174%

39O'Brien County, IAIA14,220-4.7%+111%

40Hamilton County, IAIA14,944-4.7%−304%

41Clay County, IAIA16,202-4.1%+235%

42Worth County, IAIA7,338-3.9%+283%

43Howard County, IAIA9,415-3.7%−394%

44Floyd County, IAIA14,901-3.5%+281%

45Guthrie County, IAIA10,782-3.5%−192%

46Delaware County, IAIA17,674-3.5%−270%

47Van Buren County, IAIA7,131-3.1%−277%

48Clayton County, IAIA16,845-2.9%+49%

49Butler County, IAIA14,049-2.9%+6%

50Carroll County, IAIA20,303-2.8%+30153%

51Decatur County, IAIA7,655-2.7%−163%

52Allamakee County, IAIA14,238-2.4%−140%

53Jackson County, IAIA19,288-2.2%−227%

54Clinton County, IAIA46,002-2.1%+18%

55Tama County, IAIA16,796-1.9%−147%

56Woodbury County, IAIA106,649-1.6%−129%

57Lyon County, IAIA12,354-1.5%−2%

58Winneshiek County, IAIA19,733-1.2%−154%

59Wapello County, IAIA35,210-1.2%−216%

60Jasper County, IAIA38,153-1.0%−114%

61Henry County, IAIA19,349-0.9%−116%

62Mitchell County, IAIA10,650-0.9%+82%

63Buena Vista County, IAIA20,449-0.7%−133%

64Buchanan County, IAIA20,883-0.6%−154%

65Monroe County, IAIA7,406-0.6%−52%

66Franklin County, IAIA9,868-0.2%−96%

67Mahaska County, IAIA21,880+0.2%−95%

68Boone County, IAIA26,799+0.3%−92%

69Poweshiek County, IAIA18,368+0.5%−146%

70Plymouth County, IAIA25,697+0.6%−91%

71Grundy County, IAIA12,361+0.7%−76%

72Crawford County, IAIA16,237+0.9%−9%

73Dickinson County, IAIA18,077+1.5%−85%

74Clarke County, IAIA9,574+1.7%−84%

75Cedar County, IAIA18,359+1.7%−63%

76Union County, IAIA11,829+1.8%−153%

77Jones County, IAIA21,253+2.1%−48%

78Black Hawk County, IAIA131,532+2.4%−29%

79Muscatine County, IAIA41,853+2.5%−46%

80Davis County, IAIA9,230+2.5%−10%

81Benton County, IAIA26,004+3.0%−76%

82Marshall County, IAIA39,890+3.4%+26%

83Mills County, IAIA14,793+3.5%−65%

84Marion County, IAIA34,192+3.9%−43%

85Bremer County, IAIA25,296+4.1%+82%

86Jefferson County, IAIA15,291+4.1%−617%

87Scott County, IAIA175,259+4.1%−19%

88Iowa County, IAIA16,504+4.4%−39%

89Washington County, IAIA22,667+5.0%−7%

90Dubuque County, IAIA99,381+5.1%+60%

91Pottawattamie County, IAIA92,996+6.2%+1%

92Sioux County, IAIA36,774+6.7%+19%

93Linn County, IAIA232,028+10.2%−25%

94Madison County, IAIA17,270+11.8%−4%

95Story County, IAIA101,291+12.0%+55%

96Warren County, IAIA57,331+13.7%+6%

97Polk County, IAIA516,546+15.0%+3%

98Johnson County, IAIA160,044+17.9%+16%

99Dallas County, IAIA118,457+62.3%+69%

SHOWING 1–99 OF 99

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES