RANKING · 2010 CENSUS · 99 SHOWN OF 99

Most population lost, Iowa counties · 2010

Iowa counties that lost the most residents from the 2000 census to 2010, 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

01Cerro Gordo County, IAIA42,372-2,296+703%

02Webster County, IAIA36,838-2,222+1977%

03Lee County, IAIA32,306-2,190+245%

04Des Moines County, IAIA38,077-2,026+670%

05Woodbury County, IAIA106,649-1,705−130%

06Kossuth County, IAIA14,322-1,620+13%

07Calhoun County, IAIA9,562-1,445+268%

08Pocahontas County, IAIA6,819-1,352+57%

09Hardin County, IAIA16,455-1,278+353%

10Sac County, IAIA9,525-1,179+48%

11Fayette County, IAIA19,047-1,128−784%

12Wright County, IAIA12,801-1,105−1800%

13Page County, IAIA14,856-1,044−1085%

14Clinton County, IAIA46,002-1,033+16%

15Montgomery County, IAIA10,002-1,031+238%

16Greene County, IAIA8,658-1,030−421%

17Shelby County, IAIA11,689-1,006+1665%

18Cherokee County, IAIA11,369-963−9%

19Keokuk County, IAIA9,797-889+297%

20Winnebago County, IAIA10,251-857+115%

21Appanoose County, IAIA12,077-834+3691%

22Louisa County, IAIA10,416-796−235%

23Monona County, IAIA8,539-777+5450%

24Hamilton County, IAIA14,944-765−308%

25Hancock County, IAIA10,528-759+41%

26Ida County, IAIA6,777-748+42%

27Harrison County, IAIA14,623-738−179%

28Cass County, IAIA12,960-728+64%

29Palo Alto County, IAIA8,899-726+39%

30Emmet County, IAIA9,107-725+34%

31Audubon County, IAIA5,509-711+41%

32Clay County, IAIA16,202-705+231%

33O'Brien County, IAIA14,220-704+106%

34Chickasaw County, IAIA11,663-656+228%

35Taylor County, IAIA5,835-641+311%

36Delaware County, IAIA17,674-640−273%

37Carroll County, IAIA20,303-605+30150%

38Floyd County, IAIA14,901-597+278%

39Fremont County, IAIA6,522-569+163%

40Humboldt County, IAIA9,409-566+51%

41Adair County, IAIA7,403-561+238%

42Clayton County, IAIA16,845-549+46%

43Osceola County, IAIA5,980-541+105%

44Lucas County, IAIA8,847-524−249%

45Adams County, IAIA3,617-453+18%

46Jackson County, IAIA19,288-448−229%

47Butler County, IAIA14,049-438+3%

48Wapello County, IAIA35,210-426−217%

49Guthrie County, IAIA10,782-399−195%

50Jasper County, IAIA38,153-371−115%

51Howard County, IAIA9,415-366−398%

52Allamakee County, IAIA14,238-345−142%

53Ringgold County, IAIA4,642-338−790%

54Tama County, IAIA16,796-336−149%

55Wayne County, IAIA6,738-327−3%

56Worth County, IAIA7,338-311+279%

57Winneshiek County, IAIA19,733-254−155%

58Van Buren County, IAIA7,131-239−280%

59Decatur County, IAIA7,655-232−166%

60Henry County, IAIA19,349-191−117%

61Lyon County, IAIA12,354-182−4%

62Buena Vista County, IAIA20,449-151−134%

63Buchanan County, IAIA20,883-135−154%

64Mitchell County, IAIA10,650-98+81%

65Monroe County, IAIA7,406-46−53%

66Franklin County, IAIA9,868-24−96%

67Mahaska County, IAIA21,880+46−94%

68Boone County, IAIA26,799+82−92%

69Grundy County, IAIA12,361+84−75%

70Poweshiek County, IAIA18,368+99−145%

71Plymouth County, IAIA25,697+137−91%

72Clarke County, IAIA9,574+153−82%

73Crawford County, IAIA16,237+154−8%

74Davis County, IAIA9,230+212−7%

75Union County, IAIA11,829+225−151%

76Dickinson County, IAIA18,077+243−84%

77Cedar County, IAIA18,359+312−61%

78Jones County, IAIA21,253+417−46%

79Mills County, IAIA14,793+512−62%

80Jefferson County, IAIA15,291+662−613%

81Iowa County, IAIA16,504+684−34%

82Benton County, IAIA26,004+768−73%

83Bremer County, IAIA25,296+951+86%

84Muscatine County, IAIA41,853+1,023−44%

85Washington County, IAIA22,667+1,034−2%

86Marion County, IAIA34,192+1,257−39%

87Marshall County, IAIA39,890+1,337+29%

88Madison County, IAIA17,270+1,660+8%

89Sioux County, IAIA36,774+2,115+25%

90Black Hawk County, IAIA131,532+3,078−27%

91Dubuque County, IAIA99,381+4,510+65%

92Pottawattamie County, IAIA92,996+5,454+7%

93Warren County, IAIA57,331+5,554+20%

94Scott County, IAIA175,259+6,556−15%

95Story County, IAIA101,291+9,561+67%

96Linn County, IAIA232,028+19,525−15%

97Johnson County, IAIA160,044+19,876+34%

98Dallas County, IAIA118,457+25,385+131%

99Polk County, IAIA516,546+56,039+18%

SHOWING 1–99 OF 99

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