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About this map

Half of residents are older than this, half younger. Retirement areas run 50+, college towns can be in the low 20s.

Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024).

U.S.
38.9
Idaho
37.3
Rankings
Full list

Top and bottom zip codes in Idaho

Zip codes with 1,000+ residents

Oldest zip codes (highest median age)

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  1. 183810Cataldo64
  2. 283612Council62
  3. 383251Mackay60.6
  4. 483833Harrison59.8
  5. 583622Garden Valley59.2
  6. 683553Weippe59
  7. 783539Kooskia58.8
  8. 883340Ketchum58.5
  9. 983813Cocolalla58
  10. 1083226Challis57.2

Youngest zip codes (lowest median age)

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  1. 183844Moscow19.4
  2. 283440Rexburg21.3
  3. 383648Mountain Home Afb22.9
  4. 483448Sugar City26.7
  5. 583237Franklin27.3
  6. 683320Carey27.7
  7. 783427Iona27.9
  8. 883347Paul28
  9. 983286Weston29
  10. 1083450Terreton29.3

Median age by county in Idaho

  1. 1Custer County60
  2. 2Adams County53.9
  3. 3Boise County53.4
  4. 4Lemhi County53.3
  5. 5Clearwater County52.2
  6. 6Idaho County49.4
  7. 7Lewis County49
  8. 8Bonner County48.1
  9. 9Valley County46.9
  10. 10Blaine County45.6
  11. 11Benewah County45.5
  12. 12Washington County45
  13. 13Shoshone County44.8
  14. 14Gem County44.2
  15. 15Boundary County43.7
  16. 16Butte County41.3
  17. 17Nez Perce County41.2
  18. 18Kootenai County40.9
  19. 19Oneida County40.8
  20. 20Bear Lake County40.5
  21. 21Fremont County40
  22. 22Teton County39.6
  23. 23Owyhee County39
  24. 24Payette County38.9
  25. 25Caribou County38.5
  26. 26Ada County38.4
  27. 27Gooding County38.1
  28. 28Lincoln County37.2
  29. 29Camas County36.8
  30. 30Twin Falls County36.1
  31. 31Bannock County35.2
  32. 32Bingham County35
  33. 33Canyon County34.9
  34. 34Minidoka County34.9
  35. 35Power County34.6
  36. 36Jerome County34
  37. 37Bonneville County33.6
  38. 38Franklin County33.3
  39. 39Cassia County33.2
  40. 40Elmore County33.1
  41. 41Jefferson County32.8
  42. 42Clark County31.1
  43. 43Latah County30.6
  44. 44Madison County21.4

Questions about this map

Which zip code has the highest median age in Idaho?

Among zip codes with at least 1,000 residents, 83810 (Cataldo, ID) has the highest: 64.

Which zip code has the lowest median age in Idaho?

83844 (Moscow, ID) has the lowest: 19.4.

What is the median age for the United States?

38.9; in Idaho it is 37.3.

Where does this data come from?

U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024). Half of residents are older than this, half younger. Retirement areas run 50+, college towns can be in the low 20s.

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