RANKING · 2025 ESTIMATES · 99 SHOWN OF 99

Most population lost, Iowa counties

Iowa counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

Flip the list · Most population gained, US counties →

IowaAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Muscatine County, IAIA41,853-1,382−176%

02Lee County, IAIA32,306-1,249+97%

03Henry County, IAIA19,349-1,133−202%

04Des Moines County, IAIA38,077-833+217%

05Cerro Gordo County, IAIA42,372-755+164%

06Floyd County, IAIA14,901-726+359%

07Pottawattamie County, IAIA92,996-671−113%

08Kossuth County, IAIA14,322-506−65%

09Fayette County, IAIA19,047-462−380%

10Clinton County, IAIA46,002-458−49%

11Carroll County, IAIA20,303-457+22750%

12Winnebago County, IAIA10,251-428+7%

13Hardin County, IAIA16,455-423+50%

14Louisa County, IAIA10,416-421−171%

15Buena Vista County, IAIA20,449-374−184%

16Jefferson County, IAIA15,291-372+188%

17Calhoun County, IAIA9,562-365−7%

18Page County, IAIA14,856-355−435%

19Chickasaw County, IAIA11,663-349+75%

20Tama County, IAIA16,796-339−150%

21Winneshiek County, IAIA19,733-337−173%

22Montgomery County, IAIA10,002-328+8%

23Mahaska County, IAIA21,880-310−138%

24Union County, IAIA11,829-309−30%

25Poweshiek County, IAIA18,368-294+35%

26Cherokee County, IAIA11,369-289−73%

27Sac County, IAIA9,525-289−64%

28Crawford County, IAIA16,237-288−272%

29Butler County, IAIA14,049-285−33%

30Emmet County, IAIA9,107-281−48%

31Hancock County, IAIA10,528-267−50%

32Pocahontas County, IAIA6,819-259−70%

33Appanoose County, IAIA12,077-240+991%

34Keokuk County, IAIA9,797-236+5%

35Ida County, IAIA6,777-228−57%

36Wapello County, IAIA35,210-227−162%

37Marshall County, IAIA39,890-215−121%

38Monona County, IAIA8,539-212+1414%

39Osceola County, IAIA5,980-212−20%

40Clayton County, IAIA16,845-198−47%

41Jackson County, IAIA19,288-197−157%

42Humboldt County, IAIA9,409-188−50%

43Clay County, IAIA16,202-182−15%

44Clarke County, IAIA9,574-174−121%

45Monroe County, IAIA7,406-171+74%

46Cass County, IAIA12,960-167−62%

47Audubon County, IAIA5,509-165−67%

48Webster County, IAIA36,838-161+50%

49Iowa County, IAIA16,504-158−115%

50Franklin County, IAIA9,868-151−77%

51Cedar County, IAIA18,359-146−118%

52Wright County, IAIA12,801-142−318%

53Greene County, IAIA8,658-113−135%

54Worth County, IAIA7,338-105+28%

55Palo Alto County, IAIA8,899-97−81%

56Hamilton County, IAIA14,944-95−126%

57Adair County, IAIA7,403-93−44%

58Adams County, IAIA3,617-87−77%

59Fremont County, IAIA6,522-83−62%

60Van Buren County, IAIA7,131-72−154%

61Taylor County, IAIA5,835-61−61%

62Shelby County, IAIA11,689-57+0%

63Howard County, IAIA9,415-54−144%

64Ringgold County, IAIA4,642-21−143%

65Plymouth County, IAIA25,697-1−100%

66Decatur County, IAIA7,655+10−97%

67Grundy County, IAIA12,361+32−91%

68O'Brien County, IAIA14,220+38−111%

69Harrison County, IAIA14,623+41−96%

70Boone County, IAIA26,799+84−92%

71Mitchell County, IAIA10,650+85−257%

72Washington County, IAIA22,667+102−90%

73Dubuque County, IAIA99,381+115−96%

74Davis County, IAIA9,230+120−48%

75Guthrie County, IAIA10,782+159−62%

76Allamakee County, IAIA14,238+177−78%

77Delaware County, IAIA17,674+186−50%

78Lucas County, IAIA8,847+213−39%

79Wayne County, IAIA6,738+241−172%

80Bremer County, IAIA25,296+308−40%

81Mills County, IAIA14,793+309−77%

82Buchanan County, IAIA20,883+318+28%

83Jasper County, IAIA38,153+340−86%

84Dickinson County, IAIA18,077+374−75%

85Black Hawk County, IAIA131,532+388−91%

86Lyon County, IAIA12,354+420−322%

87Benton County, IAIA26,004+429−85%

88Scott County, IAIA175,259+590−92%

89Jones County, IAIA21,253+607−22%

90Woodbury County, IAIA106,649+708−87%

91Madison County, IAIA17,270+722−53%

92Marion County, IAIA34,192+778−62%

93Sioux County, IAIA36,774+902−47%

94Linn County, IAIA232,028+1,729−92%

95Story County, IAIA101,291+2,754−52%

96Warren County, IAIA57,331+4,928+6%

97Johnson County, IAIA160,044+7,190−52%

98Dallas County, IAIA118,457+18,779+71%

99Polk County, IAIA516,546+24,145−49%

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES