RANKING · 2020 CENSUS · 44 SHOWN OF 44

Largest senior population, Idaho counties · 2020

Idaho 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 44 counties in Idaho that qualify, ranked against each other statewide.

IdahoAll states All rankings

SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPRESIDENTS 65 AND OVERVS 2000

01Ada County, IDID546,14176,920+182%

02Kootenai County, IDID191,86435,204+164%

03Canyon County, IDID275,12334,167+136%

04Bonneville County, IDID135,77117,067+103%

05Twin Falls County, IDID97,53914,835+62%

06Bannock County, IDID91,59113,339+74%

07Bonner County, IDID54,42012,410+157%

08Nez Perce County, IDID42,9058,877+44%

09Bingham County, IDID51,1537,170+66%

10Latah County, IDID41,8425,814+76%

11Blaine County, IDID25,5175,314+259%

12Payette County, IDID27,8244,972+83%

13Idaho County, IDID17,8744,859+84%

14Gem County, IDID21,7734,398+85%

15Elmore County, IDID29,4653,991+92%

16Cassia County, IDID26,3973,738+37%

17Jefferson County, IDID35,2973,731+110%

18Minidoka County, IDID22,9113,437+29%

19Jerome County, IDID26,3623,329+48%

20Shoshone County, IDID14,1303,315+38%

21Madison County, IDID55,1723,238+95%

22Boundary County, IDID13,9973,128+137%

23Valley County, IDID12,8313,101+173%

24Gooding County, IDID16,4462,801+29%

25Washington County, IDID11,5832,725+55%

26Clearwater County, IDID9,1182,533+82%

27Lemhi County, IDID8,4742,464+88%

28Fremont County, IDID14,2082,421+65%

29Benewah County, IDID10,5082,396+84%

30Franklin County, IDID15,8892,158+63%

31Owyhee County, IDID12,6612,134+65%

32Boise County, IDID8,5452,030+177%

33Teton County, IDID13,2541,490+233%

34Bear Lake County, IDID6,7271,372+38%

35Adams County, IDID5,0131,325+136%

36Power County, IDID8,2461,288+64%

37Custer County, IDID4,6361,281+103%

38Caribou County, IDID7,2521,251+26%

39Oneida County, IDID5,085921+41%

40Lewis County, IDID3,704919+33%

41Lincoln County, IDID5,603838+59%

42Butte County, IDID2,783582+34%

43Camas County, IDID1,316248+92%

44Clark County, IDID783152+62%

SHOWING 1–44 OF 44

Download CSV (full list, 44 rows)

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