Fastest-growing counties in Idaho

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July 1, 2022
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Fastest-growing counties in Idaho

Why do people move from one county or region to another? The usual suspects are jobs, family, significant others, and overall cost of living, but there are other elements at play. For those with children, moving within close proximity of a highly rated school district is a key contributing factor. For younger adults just starting out, living someplace with a vibrant social scene might be a top priority. And for those whose careers have wound down after a lifetime of work, finding retirement-friendly communities is the goal—communities deemed to be safe, offer accessibility to medical resources and leisure activities in equal measure, and be affordable for those on a limited income.

This is, of course, by no means an exhaustive list. People’s reasons for choosing to live where they do are as diverse as people themselves.

As far as why certain counties across the U.S. have experienced growth, relocation is not the sole, or even primary, reason why. While more than 1,800 counties saw population gains in 2021, approximately 73% of all U.S. counties saw what the U.S. Census Bureau characterizes as a natural decrease. This was a significant jump from 2020, when 55.5% of countries experienced such a decrease. According to the Bureau, natural decrease is the simple result of “when there are more deaths than births in a population over a given time period.” In 2021, the conflation of fewer births with an aging population that was also absorbing a higher-than-usual mortality rate due to the ongoing COVID-19 pandemic led to this “increased decrease.”

Nonetheless, as stated 1,800 counties nationwide have grown larger over the last year, and a sizable percentage of them are in Idaho. Stacker compiled a list of the fastest-growing counties in Idaho using data from the U.S. Census Bureau. Counties are ranked by the highest population growth from 2010 to 2020, based on the U.S. Decennial Census.

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Squelle // Wikimedia Commons

#44. Butte County

- 2010 to 2020 population change: -317
--- #1,936 among all counties nationwide
- 2010 to 2020 percent population change: -11.0%
--- #43 among counties in Idaho, #2,919 among all counties nationwide
- 2020 population: 2,574
--- #42 largest county in Idaho, #2,987 largest county nationwide
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rustejunk // Wikimedia Commons

#43. Lewis County

- 2010 to 2020 population change: -288
--- #1,897 among all counties nationwide
- 2010 to 2020 percent population change: -7.5%
--- #42 among counties in Idaho, #2,673 among all counties nationwide
- 2020 population: 3,533
--- #41 largest county in Idaho, #2,919 largest county nationwide
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Kristen Taylor // Wikimedia Commons

#42. Clark County

- 2010 to 2020 population change: -192
--- #1,758 among all counties nationwide
- 2010 to 2020 percent population change: -19.6%
--- #44 among counties in Idaho, #3,115 among all counties nationwide
- 2020 population: 790
--- #44 largest county in Idaho, #3,115 largest county nationwide
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tinosa // Wikimedia Commons

#41. Custer County

- 2010 to 2020 population change: -93
--- #1,624 among all counties nationwide
- 2010 to 2020 percent population change: -2.1%
--- #40 among counties in Idaho, #1,876 among all counties nationwide
- 2020 population: 4,275
--- #40 largest county in Idaho, #2,866 largest county nationwide
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Tom Young // Wikimedia Commons

#40. Lincoln County

- 2010 to 2020 population change: -81
--- #1,600 among all counties nationwide
- 2010 to 2020 percent population change: -1.6%
--- #39 among counties in Idaho, #1,756 among all counties nationwide
- 2020 population: 5,127
--- #37 largest county in Idaho, #2,816 largest county nationwide

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Cornellrockey04 // Wikimedia Commons

#39. Camas County

- 2010 to 2020 population change: -40
--- #1,543 among all counties nationwide
- 2010 to 2020 percent population change: -3.6%
--- #41 among counties in Idaho, #2,089 among all counties nationwide
- 2020 population: 1,077
--- #43 largest county in Idaho, #3,104 largest county nationwide
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Jon Roanhaus // Wikimedia Commons

#38. Clearwater County

- 2010 to 2020 population change: -27
--- #1,528 among all counties nationwide
- 2010 to 2020 percent population change: -0.3%
--- #38 among counties in Idaho, #1,547 among all counties nationwide
- 2020 population: 8,734
--- #31 largest county in Idaho, #2,508 largest county nationwide
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John Stanton // Wikimedia Commons

#37. Lemhi County

- 2010 to 2020 population change: +38
--- #1,444 among all counties nationwide
- 2010 to 2020 percent population change: +0.5%
--- #37 among counties in Idaho, #1,416 among all counties nationwide
- 2020 population: 7,974
--- #32 largest county in Idaho, #2,580 largest county nationwide
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JERRYE & ROY KLOTZ MD // Wikimedia Commons

#36. Power County

- 2010 to 2020 population change: +61
--- #1,420 among all counties nationwide
- 2010 to 2020 percent population change: +0.8%
--- #36 among counties in Idaho, #1,366 among all counties nationwide
- 2020 population: 7,878
--- #33 largest county in Idaho, #2,584 largest county nationwide
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Dschwen // Wikimedia Commons

#35. Caribou County

- 2010 to 2020 population change: +64
--- #1,416 among all counties nationwide
- 2010 to 2020 percent population change: +0.9%
--- #34 among counties in Idaho, #1,346 among all counties nationwide
- 2020 population: 7,027
--- #35 largest county in Idaho, #2,656 largest county nationwide

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NPS photo // Wikimedia Commons

#34. Gooding County

- 2010 to 2020 population change: +134
--- #1,368 among all counties nationwide
- 2010 to 2020 percent population change: +0.9%
--- #35 among counties in Idaho, #1,352 among all counties nationwide
- 2020 population: 15,598
--- #21 largest county in Idaho, #2,056 largest county nationwide
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Aualliso // Wikimedia Commons

#33. Fremont County

- 2010 to 2020 population change: +146
--- #1,360 among all counties nationwide
- 2010 to 2020 percent population change: +1.1%
--- #33 among counties in Idaho, #1,323 among all counties nationwide
- 2020 population: 13,388
--- #23 largest county in Idaho, #2,189 largest county nationwide
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Ian Poellet // Wikimedia Commons

#32. Benewah County

- 2010 to 2020 population change: +245
--- #1,303 among all counties nationwide
- 2010 to 2020 percent population change: +2.6%
--- #31 among counties in Idaho, #1,102 among all counties nationwide
- 2020 population: 9,530
--- #30 largest county in Idaho, #2,451 largest county nationwide
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Forest Service Northern Region from Missoula, MT, USA // Wikimedia Commons

#31. Idaho County

- 2010 to 2020 population change: +274
--- #1,276 among all counties nationwide
- 2010 to 2020 percent population change: +1.7%
--- #32 among counties in Idaho, #1,232 among all counties nationwide
- 2020 population: 16,541
--- #20 largest county in Idaho, #2,001 largest county nationwide
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Tricia Simpson // Wikimedia Commons

#30. Oneida County

- 2010 to 2020 population change: +278
--- #1,274 among all counties nationwide
- 2010 to 2020 percent population change: +6.5%
--- #22 among counties in Idaho, #665 among all counties nationwide
- 2020 population: 4,564
--- #38 largest county in Idaho, #2,847 largest county nationwide

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Sam Beebe // Wikimedia Commons

#29. Washington County

- 2010 to 2020 population change: +302
--- #1,260 among all counties nationwide
- 2010 to 2020 percent population change: +3.0%
--- #30 among counties in Idaho, #1,061 among all counties nationwide
- 2020 population: 10,500
--- #29 largest county in Idaho, #2,379 largest county nationwide
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Tricia Simpson // Wikimedia Commons

#28. Bear Lake County

- 2010 to 2020 population change: +386
--- #1,212 among all counties nationwide
- 2010 to 2020 percent population change: +6.4%
--- #23 among counties in Idaho, #668 among all counties nationwide
- 2020 population: 6,372
--- #36 largest county in Idaho, #2,708 largest county nationwide
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United States Department of Agriculture // Wikimedia Commons

#27. Owyhee County

- 2010 to 2020 population change: +387
--- #1,211 among all counties nationwide
- 2010 to 2020 percent population change: +3.4%
--- #28 among counties in Idaho, #1,009 among all counties nationwide
- 2020 population: 11,913
--- #26 largest county in Idaho, #2,288 largest county nationwide
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Ken Lund // Wikimedia Commons

#26. Adams County

- 2010 to 2020 population change: +403
--- #1,203 among all counties nationwide
- 2010 to 2020 percent population change: +10.1%
--- #15 among counties in Idaho, #409 among all counties nationwide
- 2020 population: 4,379
--- #39 largest county in Idaho, #2,862 largest county nationwide
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jfergusonphotos // Shutterstock

#25. Shoshone County

- 2010 to 2020 population change: +404
--- #1,202 among all counties nationwide
- 2010 to 2020 percent population change: +3.2%
--- #29 among counties in Idaho, #1,030 among all counties nationwide
- 2020 population: 13,169
--- #24 largest county in Idaho, #2,204 largest county nationwide

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PdxCobra // Wikimedia Commons

#24. Boise County

- 2010 to 2020 population change: +582
--- #1,124 among all counties nationwide
- 2010 to 2020 percent population change: +8.3%
--- #18 among counties in Idaho, #539 among all counties nationwide
- 2020 population: 7,610
--- #34 largest county in Idaho, #2,609 largest county nationwide
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Federal Highway Administration // Wikimedia Commons

#23. Boundary County

- 2010 to 2020 population change: +1,084
--- #977 among all counties nationwide
- 2010 to 2020 percent population change: +9.9%
--- #16 among counties in Idaho, #427 among all counties nationwide
- 2020 population: 12,056
--- #25 largest county in Idaho, #2,276 largest county nationwide
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Ken Lund // Wikimedia Commons

#22. Franklin County

- 2010 to 2020 population change: +1,408
--- #924 among all counties nationwide
- 2010 to 2020 percent population change: +11.0%
--- #14 among counties in Idaho, #366 among all counties nationwide
- 2020 population: 14,194
--- #22 largest county in Idaho, #2,134 largest county nationwide
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Lowjumpingfrog // Wikimedia Commons

#21. Teton County

- 2010 to 2020 population change: +1,460
--- #914 among all counties nationwide
- 2010 to 2020 percent population change: +14.4%
--- #11 among counties in Idaho, #244 among all counties nationwide
- 2020 population: 11,630
--- #28 largest county in Idaho, #2,303 largest county nationwide
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Ken Lund // Wikimedia Commons

#20. Minidoka County

- 2010 to 2020 population change: +1,544
--- #893 among all counties nationwide
- 2010 to 2020 percent population change: +7.7%
--- #19 among counties in Idaho, #584 among all counties nationwide
- 2020 population: 21,613
--- #18 largest county in Idaho, #1,730 largest county nationwide

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Larry D. Moore // Wikimedia Commons

#19. Elmore County

- 2010 to 2020 population change: +1,628
--- #877 among all counties nationwide
- 2010 to 2020 percent population change: +6.0%
--- #25 among counties in Idaho, #713 among all counties nationwide
- 2020 population: 28,666
--- #13 largest county in Idaho, #1,468 largest county nationwide
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wilson44691 // Wikimedia Commons

#18. Cassia County

- 2010 to 2020 population change: +1,703
--- #866 among all counties nationwide
- 2010 to 2020 percent population change: +7.4%
--- #20 among counties in Idaho, #602 among all counties nationwide
- 2020 population: 24,655
--- #15 largest county in Idaho, #1,620 largest county nationwide
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Larry D. Moore // Wikimedia Commons

#17. Jerome County

- 2010 to 2020 population change: +1,863
--- #837 among all counties nationwide
- 2010 to 2020 percent population change: +8.3%
--- #17 among counties in Idaho, #533 among all counties nationwide
- 2020 population: 24,237
--- #17 largest county in Idaho, #1,637 largest county nationwide
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Karthikc123 // Wikimedia Commons

#16. Valley County

- 2010 to 2020 population change: +1,884
--- #835 among all counties nationwide
- 2010 to 2020 percent population change: +19.1%
--- #5 among counties in Idaho, #130 among all counties nationwide
- 2020 population: 11,746
--- #27 largest county in Idaho, #2,295 largest county nationwide
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Apstrinka // Wikimedia Commons

#15. Latah County

- 2010 to 2020 population change: +2,273
--- #786 among all counties nationwide
- 2010 to 2020 percent population change: +6.1%
--- #24 among counties in Idaho, #701 among all counties nationwide
- 2020 population: 39,517
--- #11 largest county in Idaho, #1,192 largest county nationwide

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KRRK // Wikimedia Commons

#14. Bingham County

- 2010 to 2020 population change: +2,385
--- #765 among all counties nationwide
- 2010 to 2020 percent population change: +5.2%
--- #26 among counties in Idaho, #794 among all counties nationwide
- 2020 population: 47,992
--- #8 largest county in Idaho, #1,022 largest county nationwide
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John D // Wikimedia Commons

#13. Gem County

- 2010 to 2020 population change: +2,404
--- #763 among all counties nationwide
- 2010 to 2020 percent population change: +14.4%
--- #10 among counties in Idaho, #242 among all counties nationwide
- 2020 population: 19,123
--- #19 largest county in Idaho, #1,864 largest county nationwide
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Ian Poellet // Wikimedia Commons

#12. Payette County

- 2010 to 2020 population change: +2,763
--- #738 among all counties nationwide
- 2010 to 2020 percent population change: +12.2%
--- #13 among counties in Idaho, #314 among all counties nationwide
- 2020 population: 25,386
--- #14 largest county in Idaho, #1,584 largest county nationwide
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Dsdugan // Wikimedia Commons

#11. Nez Perce County

- 2010 to 2020 population change: +2,825
--- #732 among all counties nationwide
- 2010 to 2020 percent population change: +7.2%
--- #21 among counties in Idaho, #618 among all counties nationwide
- 2020 population: 42,090
--- #10 largest county in Idaho, #1,142 largest county nationwide
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Greg L. Wright // Wikimedia Commons

#10. Blaine County

- 2010 to 2020 population change: +2,896
--- #722 among all counties nationwide
- 2010 to 2020 percent population change: +13.5%
--- #12 among counties in Idaho, #263 among all counties nationwide
- 2020 population: 24,272
--- #16 largest county in Idaho, #1,636 largest county nationwide

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Michlaovic // Wikimedia

#9. Bannock County

- 2010 to 2020 population change: +4,179
--- #615 among all counties nationwide
- 2010 to 2020 percent population change: +5.0%
--- #27 among counties in Idaho, #818 among all counties nationwide
- 2020 population: 87,018
--- #6 largest county in Idaho, #669 largest county nationwide
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Bathlander // Wikimedia Commons

#8. Jefferson County

- 2010 to 2020 population change: +4,751
--- #579 among all counties nationwide
- 2010 to 2020 percent population change: +18.2%
--- #7 among counties in Idaho, #146 among all counties nationwide
- 2020 population: 30,891
--- #12 largest county in Idaho, #1,409 largest county nationwide
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L'Aquatique // Wikimedia Commons

#7. Bonner County

- 2010 to 2020 population change: +6,233
--- #529 among all counties nationwide
- 2010 to 2020 percent population change: +15.2%
--- #9 among counties in Idaho, #219 among all counties nationwide
- 2020 population: 47,110
--- #9 largest county in Idaho, #1,033 largest county nationwide
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Karthikc123 // Wikimedia Commons

#6. Twin Falls County

- 2010 to 2020 population change: +12,816
--- #375 among all counties nationwide
- 2010 to 2020 percent population change: +16.6%
--- #8 among counties in Idaho, #178 among all counties nationwide
- 2020 population: 90,046
--- #5 largest county in Idaho, #660 largest county nationwide
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Ken Lund // Wikimedia Commons

#5. Madison County

- 2010 to 2020 population change: +15,377
--- #343 among all counties nationwide
- 2010 to 2020 percent population change: +41.0%
--- #1 among counties in Idaho, #14 among all counties nationwide
- 2020 population: 52,913
--- #7 largest county in Idaho, #951 largest county nationwide

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Jcarr29 // Wikimedia Commons

#4. Bonneville County

- 2010 to 2020 population change: +19,730
--- #295 among all counties nationwide
- 2010 to 2020 percent population change: +18.9%
--- #6 among counties in Idaho, #131 among all counties nationwide
- 2020 population: 123,964
--- #4 largest county in Idaho, #512 largest county nationwide
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Antony-22 // Wikimedia Commons

#3. Kootenai County

- 2010 to 2020 population change: +32,868
--- #191 among all counties nationwide
- 2010 to 2020 percent population change: +23.7%
--- #3 among counties in Idaho, #81 among all counties nationwide
- 2020 population: 171,362
--- #3 largest county in Idaho, #387 largest county nationwide
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Tamanoeconomico // Wikimedia Commons

#2. Canyon County

- 2010 to 2020 population change: +42,182
--- #153 among all counties nationwide
- 2010 to 2020 percent population change: +22.3%
--- #4 among counties in Idaho, #87 among all counties nationwide
- 2020 population: 231,105
--- #2 largest county in Idaho, #297 largest county nationwide
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Charles Knowles // Shutterstock

#1. Ada County

- 2010 to 2020 population change: +102,602
--- #50 among all counties nationwide
- 2010 to 2020 percent population change: +26.1%
--- #2 among counties in Idaho, #56 among all counties nationwide
- 2020 population: 494,967
--- #1 largest county in Idaho, #145 largest county nationwide

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