RANKING · 2000 CENSUS · 44 SHOWN OF 44

Most population gained, Idaho counties · 2000

Idaho counties that added the most residents from the 1990 census to 2000, by raw count of people rather than percentage. This list covers the 44 counties in Idaho that qualify, ranked against each other statewide. The median across all 44 is +2,097.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01Ada County, IDID546,141+95,129–

02Canyon County, IDID275,123+41,365–

03Kootenai County, IDID191,864+38,890–

04Twin Falls County, IDID97,539+10,704–

05Bonneville County, IDID135,771+10,315–

06Bonner County, IDID54,420+10,213–

07Bannock County, IDID91,591+9,539–

08Elmore County, IDID29,465+7,925–

09Blaine County, IDID25,517+5,439–

10Latah County, IDID41,842+4,318–

11Bingham County, IDID51,153+4,152–

12Payette County, IDID27,824+4,144–

13Madison County, IDID55,172+3,793–

14Nez Perce County, IDID42,905+3,656–

15Gem County, IDID21,773+3,337–

16Jerome County, IDID26,362+3,204–

17Boise County, IDID8,545+3,161–

18Jefferson County, IDID35,297+2,612–

19Teton County, IDID13,254+2,560–

20Gooding County, IDID16,446+2,522–

21Owyhee County, IDID12,661+2,252–

22Franklin County, IDID15,889+2,097–

23Cassia County, IDID26,397+1,884–

24Idaho County, IDID17,874+1,728–

25Valley County, IDID12,831+1,542–

26Boundary County, IDID13,997+1,539–

27Washington County, IDID11,583+1,427–

28Benewah County, IDID10,508+1,234–

29Lemhi County, IDID8,474+907–

30Fremont County, IDID14,208+882–

31Minidoka County, IDID22,911+813–

32Lincoln County, IDID5,603+736–

33Oneida County, IDID5,085+633–

34Power County, IDID8,246+452–

35Clearwater County, IDID9,118+425–

36Caribou County, IDID7,252+341–

37Bear Lake County, IDID6,727+327–

38Camas County, IDID1,316+264–

39Clark County, IDID783+260–

40Lewis County, IDID3,704+231–

41Adams County, IDID5,013+222–

42Custer County, IDID4,636+209–

43Butte County, IDID2,783-19–

44Shoshone County, IDID14,130-160–

SHOWING 1–44 OF 44

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