RANKING · 2020 CENSUS · 99 SHOWN OF 99

Most population lost, Iowa counties · 2020

Iowa counties that lost the most residents from the 2010 census to 2020, by raw count of people rather than percentage. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Clinton County, IAIA46,002-2,656+198%

02Lee County, IAIA32,306-2,307+263%

03Des Moines County, IAIA38,077-1,415+438%

04Fayette County, IAIA19,047-1,371−931%

05Jefferson County, IAIA15,291-1,180+815%

06Clayton County, IAIA16,845-1,086+189%

07Cerro Gordo County, IAIA42,372-1,024+258%

08Webster County, IAIA36,838-1,014+848%

09Winneshiek County, IAIA19,733-986−313%

10Emmet County, IAIA9,107-914+69%

11Fremont County, IAIA6,522-836+287%

12Cass County, IAIA12,960-829+87%

13Decatur County, IAIA7,655-812−331%

14Page County, IAIA14,856-721−780%

15Kossuth County, IAIA14,322-715−50%

16Floyd County, IAIA14,901-676+328%

17Franklin County, IAIA9,868-661+0%

18Hardin County, IAIA16,455-656+133%

19Hamilton County, IAIA14,944-634−273%

20Tama County, IAIA16,796-632−192%

21Mills County, IAIA14,793-575−143%

22Crawford County, IAIA16,237-571−442%

23Appanoose County, IAIA12,077-570+2491%

24Greene County, IAIA8,658-565−276%

25Louisa County, IAIA10,416-550−193%

26Hancock County, IAIA10,528-546+1%

27Marshall County, IAIA39,890-543−152%

28Sac County, IAIA9,525-536−33%

29Butler County, IAIA14,049-533+25%

30Benton County, IAIA26,004-501−117%

31Monona County, IAIA8,539-492+3414%

32Keokuk County, IAIA9,797-478+113%

33Ringgold County, IAIA4,642-468−1055%

34Audubon County, IAIA5,509-445−12%

35Chickasaw County, IAIA11,663-427+114%

36Palo Alto County, IAIA8,899-425−19%

37Taylor County, IAIA5,835-421+170%

38Shelby County, IAIA11,689-421+639%

39Cherokee County, IAIA11,369-414−61%

40Montgomery County, IAIA10,002-410+34%

41Union County, IAIA11,829-396−10%

42Buchanan County, IAIA20,883-393−258%

43Monroe County, IAIA7,406-393+301%

44Van Buren County, IAIA7,131-367−376%

45Jackson County, IAIA19,288-363−205%

46Harrison County, IAIA14,623-346−137%

47Guthrie County, IAIA10,782-331−179%

48Adams County, IAIA3,617-325−15%

49Wright County, IAIA12,801-286−540%

50Clay County, IAIA16,202-283+33%

51Delaware County, IAIA17,674-276−175%

52Osceola County, IAIA5,980-270+2%

53Allamakee County, IAIA14,238-269−133%

54Lucas County, IAIA8,847-264−175%

55Poweshiek County, IAIA18,368-252+16%

56Pocahontas County, IAIA6,819-232−73%

57Humboldt County, IAIA9,409-218−42%

58O'Brien County, IAIA14,220-216−37%

59Mitchell County, IAIA10,650-211+291%

60Mahaska County, IAIA21,880-191−123%

61Wapello County, IAIA35,210-188−152%

62Winnebago County, IAIA10,251-187−53%

63Adair County, IAIA7,403-186+12%

64Worth County, IAIA7,338-155+89%

65Grundy County, IAIA12,361-124−136%

66Howard County, IAIA9,415-97−179%

67Ida County, IAIA6,777-84−84%

68Carroll County, IAIA20,303-56+2700%

69Cedar County, IAIA18,359+6−99%

70Jones County, IAIA21,253+8−99%

71Black Hawk County, IAIA131,532+54−99%

72Wayne County, IAIA6,738+94−128%

73Marion County, IAIA34,192+105−95%

74Calhoun County, IAIA9,562+257−165%

75Iowa County, IAIA16,504+307−71%

76Henry County, IAIA19,349+337−70%

77Lyon County, IAIA12,354+353−287%

78Davis County, IAIA9,230+357+56%

79Boone County, IAIA26,799+409−61%

80Clarke County, IAIA9,574+462−45%

81Muscatine County, IAIA41,853+490−73%

82Pottawattamie County, IAIA92,996+509−90%

83Buena Vista County, IAIA20,449+563+26%

84Bremer County, IAIA25,296+712+39%

85Plymouth County, IAIA25,697+712−51%

86Washington County, IAIA22,667+861−19%

87Madison County, IAIA17,270+869−43%

88Jasper County, IAIA38,153+971−60%

89Dickinson County, IAIA18,077+1,036−32%

90Sioux County, IAIA36,774+2,168+29%

91Woodbury County, IAIA106,649+3,769−33%

92Dubuque County, IAIA99,381+5,613+105%

93Warren County, IAIA57,331+6,178+33%

94Story County, IAIA101,291+8,995+57%

95Scott County, IAIA175,259+9,445+23%

96Linn County, IAIA232,028+19,073−17%

97Johnson County, IAIA160,044+21,972+48%

98Dallas County, IAIA118,457+33,543+205%

99Polk County, IAIA516,546+61,761+30%

SHOWING 1–99 OF 99

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