RANKING · 2010 CENSUS · 99 SHOWN OF 99

Fastest growing, Iowa counties · 2010

Iowa counties ranked by population growth from the 2000 census to 2010. 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Dallas County, IAIA118,457+62.3%+25.3 pts

02Johnson County, IAIA160,044+17.9%+2.4 pts

03Polk County, IAIA516,546+15.0%+0.5 pts

04Warren County, IAIA57,331+13.7%+0.8 pts

05Story County, IAIA101,291+12.0%+4.2 pts

06Madison County, IAIA17,270+11.8%−0.5 pts

07Linn County, IAIA232,028+10.2%−3.4 pts

08Sioux County, IAIA36,774+6.7%+1.1 pts

09Pottawattamie County, IAIA92,996+6.2%+0.1 pts

10Dubuque County, IAIA99,381+5.1%+1.9 pts

11Washington County, IAIA22,667+5.0%−0.4 pts

12Iowa County, IAIA16,504+4.4%−2.8 pts

13Scott County, IAIA175,259+4.1%−1.0 pts

14Jefferson County, IAIA15,291+4.1%+4.9 pts

15Bremer County, IAIA25,296+4.1%+1.8 pts

16Marion County, IAIA34,192+3.9%−2.9 pts

17Mills County, IAIA14,793+3.5%−6.7 pts

18Marshall County, IAIA39,890+3.4%+0.7 pts

19Benton County, IAIA26,004+3.0%−9.8 pts

20Davis County, IAIA9,230+2.5%−0.3 pts

21Muscatine County, IAIA41,853+2.5%−2.1 pts

22Black Hawk County, IAIA131,532+2.4%−1.0 pts

23Jones County, IAIA21,253+2.1%−1.9 pts

24Union County, IAIA11,829+1.8%+5.3 pts

25Cedar County, IAIA18,359+1.7%−2.9 pts

26Clarke County, IAIA9,574+1.7%−8.5 pts

27Dickinson County, IAIA18,077+1.5%−8.7 pts

28Crawford County, IAIA16,237+0.9%−0.1 pts

29Grundy County, IAIA12,361+0.7%−2.1 pts

30Plymouth County, IAIA25,697+0.6%−5.7 pts

31Poweshiek County, IAIA18,368+0.5%+1.7 pts

32Boone County, IAIA26,799+0.3%−3.8 pts

33Mahaska County, IAIA21,880+0.2%−3.6 pts

34Franklin County, IAIA9,868-0.2%+5.6 pts

35Monroe County, IAIA7,406-0.6%+0.6 pts

36Buchanan County, IAIA20,883-0.6%−1.8 pts

37Buena Vista County, IAIA20,449-0.7%−3.0 pts

38Mitchell County, IAIA10,650-0.9%−0.4 pts

39Henry County, IAIA19,349-0.9%−6.7 pts

40Jasper County, IAIA38,153-1.0%−7.9 pts

41Wapello County, IAIA35,210-1.2%−2.2 pts

42Winneshiek County, IAIA19,733-1.2%−3.4 pts

43Lyon County, IAIA12,354-1.5%+0.0 pts

44Woodbury County, IAIA106,649-1.6%−7.3 pts

45Tama County, IAIA16,796-1.9%−5.8 pts

46Clinton County, IAIA46,002-2.1%−0.3 pts

47Jackson County, IAIA19,288-2.2%−3.9 pts

48Allamakee County, IAIA14,238-2.4%−8.3 pts

49Decatur County, IAIA7,655-2.7%−6.9 pts

50Carroll County, IAIA20,303-2.8%−2.8 pts

51Butler County, IAIA14,049-2.9%−0.2 pts

52Clayton County, IAIA16,845-2.9%−1.0 pts

53Van Buren County, IAIA7,131-3.1%−4.8 pts

54Delaware County, IAIA17,674-3.5%−5.5 pts

55Guthrie County, IAIA10,782-3.5%−7.3 pts

56Floyd County, IAIA14,901-3.5%−2.6 pts

57Howard County, IAIA9,415-3.7%−4.9 pts

58Worth County, IAIA7,338-3.9%−2.9 pts

59Clay County, IAIA16,202-4.1%−2.8 pts

60Hamilton County, IAIA14,944-4.7%−6.9 pts

61O'Brien County, IAIA14,220-4.7%−2.4 pts

62Harrison County, IAIA14,623-4.7%−11.1 pts

63Des Moines County, IAIA38,077-4.8%−4.2 pts

64Wayne County, IAIA6,738-4.9%−0.1 pts

65Cerro Gordo County, IAIA42,372-4.9%−4.3 pts

66Cass County, IAIA12,960-5.0%−2.0 pts

67Chickasaw County, IAIA11,663-5.0%−3.5 pts

68Fayette County, IAIA19,047-5.1%−5.9 pts

69Humboldt County, IAIA9,409-5.5%−2.0 pts

70Webster County, IAIA36,838-5.5%−5.3 pts

71Lucas County, IAIA8,847-5.6%−9.4 pts

72Lee County, IAIA32,306-5.8%−4.1 pts

73Appanoose County, IAIA12,077-6.1%−5.9 pts

74Page County, IAIA14,856-6.1%−6.8 pts

75Ringgold County, IAIA4,642-6.2%−7.1 pts

76Hancock County, IAIA10,528-6.3%−2.0 pts

77Louisa County, IAIA10,416-6.5%−11.6 pts

78Emmet County, IAIA9,107-6.6%−1.9 pts

79Hardin County, IAIA16,455-6.8%−5.3 pts

80Adair County, IAIA7,403-6.8%−4.8 pts

81Fremont County, IAIA6,522-7.1%−4.5 pts

82Palo Alto County, IAIA8,899-7.2%−2.3 pts

83Winnebago County, IAIA10,251-7.3%−4.0 pts

84Cherokee County, IAIA11,369-7.4%+0.2 pts

85Shelby County, IAIA11,689-7.6%−7.2 pts

86Wright County, IAIA12,801-7.7%−8.2 pts

87Osceola County, IAIA5,980-7.7%−4.1 pts

88Monona County, IAIA8,539-7.8%−7.6 pts

89Keokuk County, IAIA9,797-7.8%−5.9 pts

90Montgomery County, IAIA10,002-8.8%−6.2 pts

91Taylor County, IAIA5,835-9.2%−7.0 pts

92Kossuth County, IAIA14,322-9.4%−1.8 pts

93Ida County, IAIA6,777-9.5%−3.2 pts

94Greene County, IAIA8,658-9.9%−13.1 pts

95Adams County, IAIA3,617-10.1%−2.2 pts

96Sac County, IAIA9,525-10.2%−3.8 pts

97Audubon County, IAIA5,509-10.4%−3.5 pts

98Calhoun County, IAIA9,562-13.0%−9.6 pts

99Pocahontas County, IAIA6,819-15.6%−6.5 pts

SHOWING 1–99 OF 99

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS