RANKING · 2010 CENSUS · 99 SHOWN OF 99

Most population gained, Iowa counties · 2010

Iowa counties that added 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

01Polk County, IAIA516,546+56,039+18%

02Dallas County, IAIA118,457+25,385+131%

03Johnson County, IAIA160,044+19,876+34%

04Linn County, IAIA232,028+19,525−15%

05Story County, IAIA101,291+9,561+67%

06Scott County, IAIA175,259+6,556−15%

07Warren County, IAIA57,331+5,554+20%

08Pottawattamie County, IAIA92,996+5,454+7%

09Dubuque County, IAIA99,381+4,510+65%

10Black Hawk County, IAIA131,532+3,078−27%

11Sioux County, IAIA36,774+2,115+25%

12Madison County, IAIA17,270+1,660+8%

13Marshall County, IAIA39,890+1,337+29%

14Marion County, IAIA34,192+1,257−39%

15Washington County, IAIA22,667+1,034−2%

16Muscatine County, IAIA41,853+1,023−44%

17Bremer County, IAIA25,296+951+86%

18Benton County, IAIA26,004+768−73%

19Iowa County, IAIA16,504+684−34%

20Jefferson County, IAIA15,291+662−613%

21Mills County, IAIA14,793+512−62%

22Jones County, IAIA21,253+417−46%

23Cedar County, IAIA18,359+312−61%

24Dickinson County, IAIA18,077+243−84%

25Union County, IAIA11,829+225−151%

26Davis County, IAIA9,230+212−7%

27Crawford County, IAIA16,237+154−8%

28Clarke County, IAIA9,574+153−82%

29Plymouth County, IAIA25,697+137−91%

30Poweshiek County, IAIA18,368+99−145%

31Grundy County, IAIA12,361+84−75%

32Boone County, IAIA26,799+82−92%

33Mahaska County, IAIA21,880+46−94%

34Franklin County, IAIA9,868-24−96%

35Monroe County, IAIA7,406-46−53%

36Mitchell County, IAIA10,650-98+81%

37Buchanan County, IAIA20,883-135−154%

38Buena Vista County, IAIA20,449-151−134%

39Lyon County, IAIA12,354-182−4%

40Henry County, IAIA19,349-191−117%

41Decatur County, IAIA7,655-232−166%

42Van Buren County, IAIA7,131-239−280%

43Winneshiek County, IAIA19,733-254−155%

44Worth County, IAIA7,338-311+279%

45Wayne County, IAIA6,738-327−3%

46Tama County, IAIA16,796-336−149%

47Ringgold County, IAIA4,642-338−790%

48Allamakee County, IAIA14,238-345−142%

49Howard County, IAIA9,415-366−398%

50Jasper County, IAIA38,153-371−115%

51Guthrie County, IAIA10,782-399−195%

52Wapello County, IAIA35,210-426−217%

53Butler County, IAIA14,049-438+3%

54Jackson County, IAIA19,288-448−229%

55Adams County, IAIA3,617-453+18%

56Lucas County, IAIA8,847-524−249%

57Osceola County, IAIA5,980-541+105%

58Clayton County, IAIA16,845-549+46%

59Adair County, IAIA7,403-561+238%

60Humboldt County, IAIA9,409-566+51%

61Fremont County, IAIA6,522-569+163%

62Floyd County, IAIA14,901-597+278%

63Carroll County, IAIA20,303-605+30150%

64Delaware County, IAIA17,674-640−273%

65Taylor County, IAIA5,835-641+311%

66Chickasaw County, IAIA11,663-656+228%

67O'Brien County, IAIA14,220-704+106%

68Clay County, IAIA16,202-705+231%

69Audubon County, IAIA5,509-711+41%

70Emmet County, IAIA9,107-725+34%

71Palo Alto County, IAIA8,899-726+39%

72Cass County, IAIA12,960-728+64%

73Harrison County, IAIA14,623-738−179%

74Ida County, IAIA6,777-748+42%

75Hancock County, IAIA10,528-759+41%

76Hamilton County, IAIA14,944-765−308%

77Monona County, IAIA8,539-777+5450%

78Louisa County, IAIA10,416-796−235%

79Appanoose County, IAIA12,077-834+3691%

80Winnebago County, IAIA10,251-857+115%

81Keokuk County, IAIA9,797-889+297%

82Cherokee County, IAIA11,369-963−9%

83Shelby County, IAIA11,689-1,006+1665%

84Greene County, IAIA8,658-1,030−421%

85Montgomery County, IAIA10,002-1,031+238%

86Clinton County, IAIA46,002-1,033+16%

87Page County, IAIA14,856-1,044−1085%

88Wright County, IAIA12,801-1,105−1800%

89Fayette County, IAIA19,047-1,128−784%

90Sac County, IAIA9,525-1,179+48%

91Hardin County, IAIA16,455-1,278+353%

92Pocahontas County, IAIA6,819-1,352+57%

93Calhoun County, IAIA9,562-1,445+268%

94Kossuth County, IAIA14,322-1,620+13%

95Woodbury County, IAIA106,649-1,705−130%

96Des Moines County, IAIA38,077-2,026+670%

97Lee County, IAIA32,306-2,190+245%

98Webster County, IAIA36,838-2,222+1977%

99Cerro Gordo County, IAIA42,372-2,296+703%

SHOWING 1–99 OF 99

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