RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest senior population, Iowa counties · 2020

Iowa counties home to the most residents aged 65 and over as of 2020. Ranked by number of people, not the senior share. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

IowaAll states All rankings

SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPRESIDENTS 65 AND OVERVS 2000

01Polk County, IAIA516,54669,404+66%

02Linn County, IAIA232,02838,060+62%

03Scott County, IAIA175,25930,012+61%

04Black Hawk County, IAIA131,53223,265+30%

05Johnson County, IAIA160,04419,329+134%

06Dubuque County, IAIA99,38118,771+43%

07Pottawattamie County, IAIA92,99616,937+41%

08Woodbury County, IAIA106,64916,325+18%

09Story County, IAIA101,29112,869+64%

10Dallas County, IAIA118,45712,424+174%

11Cerro Gordo County, IAIA42,37210,042+22%

12Clinton County, IAIA46,0029,410+19%

13Warren County, IAIA57,3318,902+85%

14Des Moines County, IAIA38,0778,453+20%

15Muscatine County, IAIA41,8537,753+44%

16Marshall County, IAIA39,8907,746+20%

17Lee County, IAIA32,3067,635+21%

18Jasper County, IAIA38,1537,369+24%

19Webster County, IAIA36,8387,308+5%

20Wapello County, IAIA35,2106,626+3%

21Marion County, IAIA34,1926,560+29%

22Sioux County, IAIA36,7745,643+19%

23Boone County, IAIA26,7995,383+25%

24Bremer County, IAIA25,2965,073+36%

25Plymouth County, IAIA25,6974,899+24%

26Dickinson County, IAIA18,0774,877+44%

27Benton County, IAIA26,0044,684+20%

28Washington County, IAIA22,6674,669+26%

29Carroll County, IAIA20,3034,466+12%

30Fayette County, IAIA19,0474,450+6%

31Winneshiek County, IAIA19,7334,359+30%

32Jones County, IAIA21,2534,310+35%

33Jefferson County, IAIA15,2914,300+93%

34Jackson County, IAIA19,2884,283+22%

35Mahaska County, IAIA21,8804,273+17%

36Clayton County, IAIA16,8454,128+19%

37Henry County, IAIA19,3494,062+36%

38Poweshiek County, IAIA18,3684,035+22%

39Hardin County, IAIA16,4553,924+1%

40Buchanan County, IAIA20,8833,862+26%

41Cedar County, IAIA18,3593,797+29%

42Kossuth County, IAIA14,3223,632+5%

43Clay County, IAIA16,2023,611+16%

44Delaware County, IAIA17,6743,578+30%

45Tama County, IAIA16,7963,546+5%

46Page County, IAIA14,8563,528+5%

47Butler County, IAIA14,0493,482+13%

48Floyd County, IAIA14,9013,481+7%

49Buena Vista County, IAIA20,4493,368−2%

50Iowa County, IAIA16,5043,294+23%

51Allamakee County, IAIA14,2383,239+20%

52Hamilton County, IAIA14,9443,178+7%

53Cass County, IAIA12,9603,164+4%

54O'Brien County, IAIA14,2203,134−2%

55Harrison County, IAIA14,6233,023+9%

56Madison County, IAIA17,2702,994+41%

57Crawford County, IAIA16,2372,967+2%

58Appanoose County, IAIA12,0772,937+7%

59Cherokee County, IAIA11,3692,922+10%

60Wright County, IAIA12,8012,811−7%

61Mills County, IAIA14,7932,788+52%

62Shelby County, IAIA11,6892,745+2%

63Grundy County, IAIA12,3612,660+11%

64Chickasaw County, IAIA11,6632,619+12%

65Hancock County, IAIA10,5282,605+20%

66Union County, IAIA11,8292,560+11%

67Guthrie County, IAIA10,7822,523+8%

68Mitchell County, IAIA10,6502,434+4%

69Sac County, IAIA9,5252,407−8%

70Montgomery County, IAIA10,0022,390+0%

71Winnebago County, IAIA10,2512,383+7%

72Calhoun County, IAIA9,5622,293−7%

73Franklin County, IAIA9,8682,213+1%

74Monona County, IAIA8,5392,193−9%

75Lyon County, IAIA12,3542,191−1%

76Emmet County, IAIA9,1072,185+2%

77Keokuk County, IAIA9,7972,177−5%

78Louisa County, IAIA10,4162,142+25%

79Palo Alto County, IAIA8,8992,097−3%

80Greene County, IAIA8,6582,079−7%

81Humboldt County, IAIA9,4092,023−7%

82Howard County, IAIA9,4152,013+1%

83Clarke County, IAIA9,5741,936+24%

84Lucas County, IAIA8,8471,892+4%

85Adair County, IAIA7,4031,754−4%

86Pocahontas County, IAIA6,8191,696−10%

87Van Buren County, IAIA7,1311,655+11%

88Monroe County, IAIA7,4061,643+5%

89Ida County, IAIA6,7771,628−5%

90Davis County, IAIA9,2301,613+9%

91Worth County, IAIA7,3381,613+5%

92Decatur County, IAIA7,6551,604+4%

93Fremont County, IAIA6,5221,534−3%

94Taylor County, IAIA5,8351,419−9%

95Audubon County, IAIA5,5091,413−12%

96Wayne County, IAIA6,7381,369−14%

97Osceola County, IAIA5,9801,312−1%

98Ringgold County, IAIA4,6421,227−6%

99Adams County, IAIA3,617859−11%

SHOWING 1–99 OF 99

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