RANKING · 1990 CENSUS · 99 SHOWN OF 99

Largest senior population, Iowa counties · 1990

Iowa counties home to the most residents aged 65 and over as of 1990. Ranked by number of people, not the senior share. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 2,946.

IowaAll states All rankings

SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPRESIDENTS 65 AND OVERVS –

01Polk County, IAIA516,54637,539–

02Linn County, IAIA232,02820,526–

03Scott County, IAIA175,25917,298–

04Black Hawk County, IAIA131,53216,889–

05Woodbury County, IAIA106,64914,476–

06Dubuque County, IAIA99,38112,143–

07Pottawattamie County, IAIA92,99611,055–

08Clinton County, IAIA46,0028,137–

09Cerro Gordo County, IAIA42,3727,874–

10Johnson County, IAIA160,0447,163–

11Story County, IAIA101,2917,133–

12Webster County, IAIA36,8387,106–

13Des Moines County, IAIA38,0776,884–

14Wapello County, IAIA35,2106,675–

15Marshall County, IAIA39,8906,672–

16Lee County, IAIA32,3066,436–

17Jasper County, IAIA38,1535,546–

18Muscatine County, IAIA41,8535,312–

19Marion County, IAIA34,1924,859–

20Boone County, IAIA26,7994,531–

21Sioux County, IAIA36,7744,409–

22Dallas County, IAIA118,4574,350–

23Fayette County, IAIA19,0474,183–

24Hardin County, IAIA16,4554,049–

25Warren County, IAIA57,3313,945–

26Plymouth County, IAIA25,6973,816–

27Carroll County, IAIA20,3033,809–

28Bremer County, IAIA25,2963,806–

29Mahaska County, IAIA21,8803,803–

30Benton County, IAIA26,0043,723–

31Washington County, IAIA22,6673,641–

32Buena Vista County, IAIA20,4493,571–

33Page County, IAIA14,8563,534–

34Kossuth County, IAIA14,3223,526–

35Clayton County, IAIA16,8453,451–

36Tama County, IAIA16,7963,380–

37Floyd County, IAIA14,9013,349–

38Jackson County, IAIA19,2883,312–

39Buchanan County, IAIA20,8833,244–

40Butler County, IAIA14,0493,231–

41Winneshiek County, IAIA19,7333,211–

42O'Brien County, IAIA14,2203,189–

43Poweshiek County, IAIA18,3683,188–

44Henry County, IAIA19,3493,177–

45Cass County, IAIA12,9603,169–

46Wright County, IAIA12,8013,159–

47Jones County, IAIA21,2533,101–

48Dickinson County, IAIA18,0773,097–

49Hamilton County, IAIA14,9442,969–

50Appanoose County, IAIA12,0772,946–

51Cedar County, IAIA18,3592,933–

52Crawford County, IAIA16,2372,927–

53Clay County, IAIA16,2022,901–

54Harrison County, IAIA14,6232,868–

55Iowa County, IAIA16,5042,757–

56Calhoun County, IAIA9,5622,731–

57Sac County, IAIA9,5252,705–

58Allamakee County, IAIA14,2382,697–

59Shelby County, IAIA11,6892,693–

60Delaware County, IAIA17,6742,655–

61Montgomery County, IAIA10,0022,637–

62Cherokee County, IAIA11,3692,611–

63Union County, IAIA11,8292,464–

64Grundy County, IAIA12,3612,410–

65Keokuk County, IAIA9,7972,410–

66Jefferson County, IAIA15,2912,407–

67Mitchell County, IAIA10,6502,383–

68Monona County, IAIA8,5392,381–

69Chickasaw County, IAIA11,6632,368–

70Winnebago County, IAIA10,2512,318–

71Guthrie County, IAIA10,7822,296–

72Hancock County, IAIA10,5282,288–

73Franklin County, IAIA9,8682,278–

74Humboldt County, IAIA9,4092,263–

75Greene County, IAIA8,6582,262–

76Madison County, IAIA17,2702,250–

77Palo Alto County, IAIA8,8992,189–

78Emmet County, IAIA9,1072,183–

79Lyon County, IAIA12,3542,149–

80Howard County, IAIA9,4152,123–

81Pocahontas County, IAIA6,8192,078–

82Adair County, IAIA7,4031,981–

83Lucas County, IAIA8,8471,878–

84Wayne County, IAIA6,7381,856–

85Mills County, IAIA14,7931,812–

86Fremont County, IAIA6,5221,775–

87Louisa County, IAIA10,4161,741–

88Taylor County, IAIA5,8351,716–

89Decatur County, IAIA7,6551,710–

90Audubon County, IAIA5,5091,696–

91Ida County, IAIA6,7771,696–

92Monroe County, IAIA7,4061,672–

93Worth County, IAIA7,3381,668–

94Van Buren County, IAIA7,1311,568–

95Davis County, IAIA9,2301,558–

96Clarke County, IAIA9,5741,539–

97Osceola County, IAIA5,9801,406–

98Ringgold County, IAIA4,6421,313–

99Adams County, IAIA3,6171,057–

SHOWING 1–99 OF 99

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS