Fastest-growing counties in Idaho

Written by:
February 23, 2021
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Fastest-growing counties in Idaho

From 2018 to 2019, the U.S. population grew by .48%, its slowest rate in 100 years. Declining births, increasing deaths largely due to the graying Baby Boomer population, and a crackdown on immigration have contributed to many states seeing net population losses in recent years.

But in other pockets of the country, populations are growing. These shifts can be due to job opportunities, high quality of life, easy commutability to job centers, low rents, or any combination of these or other factors. 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 2019, based on 5-year estimates.

A county typically sees population growth as a “bedroom community” (a municipality with an atypically large commuting population) to a large city. These communities are typically quieter than their feeder cities, offer lower rents and a higher quality of living, and are remote enough to be immune to the feeder city’s crime, traffic, and crowds. Keep reading to see if your home county made the list.

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Larry D. Moore // Wikimedia Commons

#30. Elmore County

- 2010 to 2019 population change: +74
--- #1,462 among all counties nationwide
- 2010 to 2019 percent population change: +0.3%
--- #33 among counties in Idaho, #1,503 among all counties nationwide
- 2019 population: 26,743
--- #13 largest county in Idaho, #1,536 largest county nationwide
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rustejunk // Wikimedia Commons

#29. Lewis County

- 2010 to 2019 population change: +77
--- #1,456 among all counties nationwide
- 2010 to 2019 percent population change: +2.0%
--- #29 among counties in Idaho, #1,204 among all counties nationwide
- 2019 population: 3,838
--- #41 largest county in Idaho, #2,913 largest county nationwide
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Ken Lund // Wikimedia Commons

#28. Adams County

- 2010 to 2019 population change: +155
--- #1,379 among all counties nationwide
- 2010 to 2019 percent population change: +3.9%
--- #22 among counties in Idaho, #923 among all counties nationwide
- 2019 population: 4,097
--- #40 largest county in Idaho, #2,893 largest county nationwide
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United States Department of Agriculture // Wikimedia Commons

#27. Owyhee County

- 2010 to 2019 population change: +163
--- #1,374 among all counties nationwide
- 2010 to 2019 percent population change: +1.4%
--- #30 among counties in Idaho, #1,295 among all counties nationwide
- 2019 population: 11,552
--- #26 largest county in Idaho, #2,321 largest county nationwide
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Tricia Simpson // Wikimedia Commons

#26. Oneida County

- 2010 to 2019 population change: +173
--- #1,364 among all counties nationwide
- 2010 to 2019 percent population change: +4.1%
--- #21 among counties in Idaho, #900 among all counties nationwide
- 2019 population: 4,385
--- #38 largest county in Idaho, #2,869 largest county nationwide
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PdxCobra // Wikimedia Commons

#25. Boise County

- 2010 to 2019 population change: +256
--- #1,290 among all counties nationwide
- 2010 to 2019 percent population change: +3.6%
--- #24 among counties in Idaho, #971 among all counties nationwide
- 2019 population: 7,378
--- #34 largest county in Idaho, #2,636 largest county nationwide
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Tom Young // Wikimedia Commons

#24. Lincoln County

- 2010 to 2019 population change: +329
--- #1,240 among all counties nationwide
- 2010 to 2019 percent population change: +6.6%
--- #16 among counties in Idaho, #647 among all counties nationwide
- 2019 population: 5,350
--- #37 largest county in Idaho, #2,807 largest county nationwide
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Forest Service Northern Region from Missoula, MT, USA // Wikimedia Commons

#23. Idaho County

- 2010 to 2019 population change: +464
--- #1,174 among all counties nationwide
- 2010 to 2019 percent population change: +2.9%
--- #28 among counties in Idaho, #1,072 among all counties nationwide
- 2019 population: 16,411
--- #20 largest county in Idaho, #2,016 largest county nationwide
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John D // Wikimedia Commons

#22. Gem County

- 2010 to 2019 population change: +553
--- #1,131 among all counties nationwide
- 2010 to 2019 percent population change: +3.3%
--- #26 among counties in Idaho, #1,004 among all counties nationwide
- 2019 population: 17,331
--- #19 largest county in Idaho, #1,956 largest county nationwide
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Ian Poellet // Wikimedia Commons

#21. Payette County

- 2010 to 2019 population change: +809
--- #1,036 among all counties nationwide
- 2010 to 2019 percent population change: +3.6%
--- #23 among counties in Idaho, #970 among all counties nationwide
- 2019 population: 23,260
--- #16 largest county in Idaho, #1,668 largest county nationwide
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Karthikc123 // Wikimedia Commons

#20. Valley County

- 2010 to 2019 population change: +863
--- #1,018 among all counties nationwide
- 2010 to 2019 percent population change: +8.8%
--- #10 among counties in Idaho, #486 among all counties nationwide
- 2019 population: 10,709
--- #28 largest county in Idaho, #2,372 largest county nationwide
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Ken Lund // Wikimedia Commons

#19. Franklin County

- 2010 to 2019 population change: +967
--- #987 among all counties nationwide
- 2010 to 2019 percent population change: +7.7%
--- #12 among counties in Idaho, #551 among all counties nationwide
- 2019 population: 13,464
--- #22 largest county in Idaho, #2,194 largest county nationwide
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Greg L. Wright // Wikimedia Commons

#18. Blaine County

- 2010 to 2019 population change: +1,044
--- #964 among all counties nationwide
- 2010 to 2019 percent population change: +4.9%
--- #20 among counties in Idaho, #811 among all counties nationwide
- 2019 population: 22,373
--- #17 largest county in Idaho, #1,710 largest county nationwide
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Federal Highway Administration // Wikimedia Commons

#17. Boundary County

- 2010 to 2019 population change: +1,053
--- #961 among all counties nationwide
- 2010 to 2019 percent population change: +9.8%
--- #9 among counties in Idaho, #413 among all counties nationwide
- 2019 population: 11,845
--- #25 largest county in Idaho, #2,301 largest county nationwide
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Ken Lund // Wikimedia Commons

#16. Minidoka County

- 2010 to 2019 population change: +1,181
--- #939 among all counties nationwide
- 2010 to 2019 percent population change: +6.0%
--- #19 among counties in Idaho, #691 among all counties nationwide
- 2019 population: 20,705
--- #18 largest county in Idaho, #1,790 largest county nationwide
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Dsdugan // Wikimedia Commons

#15. Nez Perce County

- 2010 to 2019 population change: +1,331
--- #898 among all counties nationwide
- 2010 to 2019 percent population change: +3.4%
--- #25 among counties in Idaho, #991 among all counties nationwide
- 2019 population: 40,217
--- #9 largest county in Idaho, #1,171 largest county nationwide
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KRRK // Wikimedia Commons

#14. Bingham County

- 2010 to 2019 population change: +1,343
--- #894 among all counties nationwide
- 2010 to 2019 percent population change: +3.0%
--- #27 among counties in Idaho, #1,046 among all counties nationwide
- 2019 population: 45,839
--- #7 largest county in Idaho, #1,053 largest county nationwide
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wilson44691 // Wikimedia Commons

#13. Cassia County

- 2010 to 2019 population change: +1,581
--- #841 among all counties nationwide
- 2010 to 2019 percent population change: +7.2%
--- #14 among counties in Idaho, #599 among all counties nationwide
- 2019 population: 23,690
--- #15 largest county in Idaho, #1,656 largest county nationwide
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Lowjumpingfrog // Wikimedia Commons

#12. Teton County

- 2010 to 2019 population change: +2,013
--- #774 among all counties nationwide
- 2010 to 2019 percent population change: +21.4%
--- #1 among counties in Idaho, #86 among all counties nationwide
- 2019 population: 11,426
--- #27 largest county in Idaho, #2,327 largest county nationwide
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Larry D. Moore // Wikimedia Commons

#11. Jerome County

- 2010 to 2019 population change: +2,448
--- #718 among all counties nationwide
- 2010 to 2019 percent population change: +11.5%
--- #8 among counties in Idaho, #317 among all counties nationwide
- 2019 population: 23,730
--- #14 largest county in Idaho, #1,655 largest county nationwide
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Ken Lund // Wikimedia Commons

#10. Madison County

- 2010 to 2019 population change: +2,687
--- #695 among all counties nationwide
- 2010 to 2019 percent population change: +7.4%
--- #13 among counties in Idaho, #575 among all counties nationwide
- 2019 population: 39,100
--- #11 largest county in Idaho, #1,201 largest county nationwide
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Apstrinka // Wikimedia Commons

#9. Latah County

- 2010 to 2019 population change: +2,860
--- #678 among all counties nationwide
- 2010 to 2019 percent population change: +7.8%
--- #11 among counties in Idaho, #547 among all counties nationwide
- 2019 population: 39,505
--- #10 largest county in Idaho, #1,188 largest county nationwide
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L'Aquatique // Wikimedia Commons

#8. Bonner County

- 2010 to 2019 population change: +2,900
--- #674 among all counties nationwide
- 2010 to 2019 percent population change: +7.1%
--- #15 among counties in Idaho, #605 among all counties nationwide
- 2019 population: 43,611
--- #8 largest county in Idaho, #1,098 largest county nationwide
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Bathlander // Wikimedia Commons

#7. Jefferson County

- 2010 to 2019 population change: +4,011
--- #591 among all counties nationwide
- 2010 to 2019 percent population change: +16.4%
--- #5 among counties in Idaho, #164 among all counties nationwide
- 2019 population: 28,534
--- #12 largest county in Idaho, #1,474 largest county nationwide
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Michlaovic // Wikimedia

#6. Bannock County

- 2010 to 2019 population change: +5,064
--- #542 among all counties nationwide
- 2010 to 2019 percent population change: +6.3%
--- #18 among counties in Idaho, #667 among all counties nationwide
- 2019 population: 85,765
--- #5 largest county in Idaho, #667 largest county nationwide
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Karthikc123 // Wikimedia Commons

#5. Twin Falls County

- 2010 to 2019 population change: +9,940
--- #395 among all counties nationwide
- 2010 to 2019 percent population change: +13.3%
--- #7 among counties in Idaho, #241 among all counties nationwide
- 2019 population: 84,869
--- #6 largest county in Idaho, #674 largest county nationwide
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Jcarr29 // Wikimedia Commons

#4. Bonneville County

- 2010 to 2019 population change: +14,179
--- #327 among all counties nationwide
- 2010 to 2019 percent population change: +14.1%
--- #6 among counties in Idaho, #216 among all counties nationwide
- 2019 population: 114,392
--- #4 largest county in Idaho, #539 largest county nationwide
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Antony-22 // Wikimedia Commons

#3. Kootenai County

- 2010 to 2019 population change: +22,471
--- #242 among all counties nationwide
- 2010 to 2019 percent population change: +16.7%
--- #4 among counties in Idaho, #157 among all counties nationwide
- 2019 population: 157,322
--- #3 largest county in Idaho, #419 largest county nationwide
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Tamanoeconomico // Wikimedia Commons

#2. Canyon County

- 2010 to 2019 population change: +34,910
--- #152 among all counties nationwide
- 2010 to 2019 percent population change: +19.1%
--- #3 among counties in Idaho, #115 among all counties nationwide
- 2019 population: 217,633
--- #2 largest county in Idaho, #305 largest county nationwide
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Charles Knowles // Shutterstock

#1. Ada County

- 2010 to 2019 population change: +76,131
--- #61 among all counties nationwide
- 2010 to 2019 percent population change: +20.0%
--- #2 among counties in Idaho, #104 among all counties nationwide
- 2019 population: 456,849
--- #1 largest county in Idaho, #154 largest county nationwide

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