Fastest-growing counties in Colorado

Written by:
August 1, 2021
f11photo // Shutterstock

Fastest-growing counties in Colorado

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 Colorado 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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Jeffrey Beall // Wikimedia Commons

#30. Montezuma County

- 2010 to 2019 population change: +752
--- #1,053 among all counties nationwide
- 2010 to 2019 percent population change: +3.0%
--- #37 among counties in Colorado, #1,055 among all counties nationwide
- 2019 population: 26,031
--- #21 largest county in Colorado, #1,562 largest county nationwide
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Jeffrey Beall // Wikimedia Commons

#29. Grand County

- 2010 to 2019 population change: +777
--- #1,043 among all counties nationwide
- 2010 to 2019 percent population change: +5.3%
--- #33 among counties in Colorado, #762 among all counties nationwide
- 2019 population: 15,303
--- #32 largest county in Colorado, #2,076 largest county nationwide
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Milan Suvajac // Wikimedia Commons

#28. Alamosa County

- 2010 to 2019 population change: +814
--- #1,033 among all counties nationwide
- 2010 to 2019 percent population change: +5.3%
--- #34 among counties in Colorado, #765 among all counties nationwide
- 2019 population: 16,107
--- #31 largest county in Colorado, #2,032 largest county nationwide
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Jeffrey Beall // Wikimedia Commons

#27. Custer County

- 2010 to 2019 population change: +877
--- #1,014 among all counties nationwide
- 2010 to 2019 percent population change: +22.5%
--- #5 among counties in Colorado, #73 among all counties nationwide
- 2019 population: 4,776
--- #53 largest county in Colorado, #2,849 largest county nationwide
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Jeffrey Beall // Wikimedia Commons

#26. Gilpin County

- 2010 to 2019 population change: +892
--- #1,010 among all counties nationwide
- 2010 to 2019 percent population change: +17.4%
--- #9 among counties in Colorado, #141 among all counties nationwide
- 2019 population: 6,018
--- #47 largest county in Colorado, #2,748 largest county nationwide
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Milan Suvajac // Wikimedia Commons

#25. Archuleta County

- 2010 to 2019 population change: +1,117
--- #948 among all counties nationwide
- 2010 to 2019 percent population change: +9.2%
--- #24 among counties in Colorado, #457 among all counties nationwide
- 2019 population: 13,253
--- #34 largest county in Colorado, #2,217 largest county nationwide
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Jeffrey Beall from Colorado, USA // Wikimedia Commons

#24. Montrose County

- 2010 to 2019 population change: +1,420
--- #882 among all counties nationwide
- 2010 to 2019 percent population change: +3.5%
--- #36 among counties in Colorado, #981 among all counties nationwide
- 2019 population: 41,686
--- #17 largest county in Colorado, #1,139 largest county nationwide
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#23. Pitkin County

- 2010 to 2019 population change: +1,537
--- #849 among all counties nationwide
- 2010 to 2019 percent population change: +9.4%
--- #22 among counties in Colorado, #441 among all counties nationwide
- 2019 population: 17,926
--- #28 largest county in Colorado, #1,922 largest county nationwide
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Thomson200 // Wikimedia Commons

#22. Park County

- 2010 to 2019 population change: +1,581
--- #841 among all counties nationwide
- 2010 to 2019 percent population change: +9.7%
--- #21 among counties in Colorado, #417 among all counties nationwide
- 2019 population: 17,867
--- #29 largest county in Colorado, #1,926 largest county nationwide
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The Greater Southwestern Exploration Company from Long Beach, California, United States // Wikimedia Commons

#21. Gunnison County

- 2010 to 2019 population change: +1,666
--- #829 among all counties nationwide
- 2010 to 2019 percent population change: +11.0%
--- #17 among counties in Colorado, #341 among all counties nationwide
- 2019 population: 16,802
--- #30 largest county in Colorado, #1,992 largest county nationwide
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David Shankbone // Wikimedia Commons

#20. Teller County

- 2010 to 2019 population change: +1,703
--- #822 among all counties nationwide
- 2010 to 2019 percent population change: +7.5%
--- #28 among counties in Colorado, #572 among all counties nationwide
- 2019 population: 24,524
--- #24 largest county in Colorado, #1,622 largest county nationwide
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Jeffrey Beall // Wikimedia Commons

#19. Chaffee County

- 2010 to 2019 population change: +2,017
--- #773 among all counties nationwide
- 2010 to 2019 percent population change: +11.5%
--- #14 among counties in Colorado, #318 among all counties nationwide
- 2019 population: 19,557
--- #26 largest county in Colorado, #1,847 largest county nationwide
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#18. Routt County

- 2010 to 2019 population change: +2,148
--- #752 among all counties nationwide
- 2010 to 2019 percent population change: +9.4%
--- #23 among counties in Colorado, #442 among all counties nationwide
- 2019 population: 25,072
--- #23 largest county in Colorado, #1,602 largest county nationwide
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Jeffrey Beall // Wikimedia Commons

#17. Elbert County

- 2010 to 2019 population change: +3,005
--- #661 among all counties nationwide
- 2010 to 2019 percent population change: +13.2%
--- #12 among counties in Colorado, #243 among all counties nationwide
- 2019 population: 25,717
--- #22 largest county in Colorado, #1,573 largest county nationwide
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#16. Summit County

- 2010 to 2019 population change: +3,544
--- #620 among all counties nationwide
- 2010 to 2019 percent population change: +13.1%
--- #13 among counties in Colorado, #251 among all counties nationwide
- 2019 population: 30,649
--- #18 largest county in Colorado, #1,416 largest county nationwide
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Jeffrey Beall // Wikimedia Commons

#15. Eagle County

- 2010 to 2019 population change: +3,888
--- #598 among all counties nationwide
- 2010 to 2019 percent population change: +7.7%
--- #27 among counties in Colorado, #558 among all counties nationwide
- 2019 population: 54,681
--- #15 largest county in Colorado, #928 largest county nationwide
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GSpics // Wikimedia Commons

#14. Garfield County

- 2010 to 2019 population change: +4,294
--- #575 among all counties nationwide
- 2010 to 2019 percent population change: +7.8%
--- #26 among counties in Colorado, #544 among all counties nationwide
- 2019 population: 59,055
--- #13 largest county in Colorado, #877 largest county nationwide
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#13. La Plata County

- 2010 to 2019 population change: +5,468
--- #524 among all counties nationwide
- 2010 to 2019 percent population change: +10.9%
--- #18 among counties in Colorado, #347 among all counties nationwide
- 2019 population: 55,617
--- #14 largest county in Colorado, #912 largest county nationwide
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Eleaf // Wikimedia Commons

#12. Mesa County

- 2010 to 2019 population change: +8,934
--- #419 among all counties nationwide
- 2010 to 2019 percent population change: +6.3%
--- #30 among counties in Colorado, #666 among all counties nationwide
- 2019 population: 151,218
--- #11 largest county in Colorado, #435 largest county nationwide
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John Wark // Wikicommons

#11. Pueblo County

- 2010 to 2019 population change: +9,738
--- #400 among all counties nationwide
- 2010 to 2019 percent population change: +6.2%
--- #31 among counties in Colorado, #673 among all counties nationwide
- 2019 population: 165,982
--- #10 largest county in Colorado, #389 largest county nationwide
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#10. Broomfield County

- 2010 to 2019 population change: +15,014
--- #316 among all counties nationwide
- 2010 to 2019 percent population change: +28.4%
--- #2 among counties in Colorado, #40 among all counties nationwide
- 2019 population: 67,886
--- #12 largest county in Colorado, #785 largest county nationwide
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Maciej Bledowski // Shutterstock

#9. Boulder County

- 2010 to 2019 population change: +32,333
--- #167 among all counties nationwide
- 2010 to 2019 percent population change: +11.1%
--- #15 among counties in Colorado, #333 among all counties nationwide
- 2019 population: 322,510
--- #8 largest county in Colorado, #214 largest county nationwide
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Yassie // Wikimedia Commons

#8. Jefferson County

- 2010 to 2019 population change: +46,184
--- #114 among all counties nationwide
- 2010 to 2019 percent population change: +8.7%
--- #25 among counties in Colorado, #488 among all counties nationwide
- 2019 population: 574,798
--- #4 largest county in Colorado, #114 largest county nationwide
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Citycommunications // Wikicommons

#7. Larimer County

- 2010 to 2019 population change: +53,624
--- #99 among all counties nationwide
- 2010 to 2019 percent population change: +18.4%
--- #8 among counties in Colorado, #124 among all counties nationwide
- 2019 population: 344,786
--- #6 largest county in Colorado, #203 largest county nationwide
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Peter Romero // Wikimedia Commons

#6. Weld County

- 2010 to 2019 population change: +62,485
--- #83 among all counties nationwide
- 2010 to 2019 percent population change: +25.7%
--- #3 among counties in Colorado, #56 among all counties nationwide
- 2019 population: 305,345
--- #9 largest county in Colorado, #229 largest county nationwide
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Billy Hathorn // Wikimedia Commons

#5. Douglas County

- 2010 to 2019 population change: +62,601
--- #82 among all counties nationwide
- 2010 to 2019 percent population change: +22.9%
--- #4 among counties in Colorado, #68 among all counties nationwide
- 2019 population: 336,041
--- #7 largest county in Colorado, #206 largest county nationwide
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Bdearthco // Wikimedia Commons

#4. Adams County

- 2010 to 2019 population change: +78,778
--- #60 among all counties nationwide
- 2010 to 2019 percent population change: +18.5%
--- #7 among counties in Colorado, #121 among all counties nationwide
- 2019 population: 504,108
--- #5 largest county in Colorado, #139 largest county nationwide
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Mountain Mike Johans // Wikimedia Commons

#3. Arapahoe County

- 2010 to 2019 population change: +91,700
--- #54 among all counties nationwide
- 2010 to 2019 percent population change: +16.6%
--- #10 among counties in Colorado, #158 among all counties nationwide
- 2019 population: 644,560
--- #3 largest county in Colorado, #104 largest county nationwide
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Robert Corby // Wikimedia Commons

#2. El Paso County

- 2010 to 2019 population change: +98,986
--- #45 among all counties nationwide
- 2010 to 2019 percent population change: +16.5%
--- #11 among counties in Colorado, #160 among all counties nationwide
- 2019 population: 698,974
--- #2 largest county in Colorado, #93 largest county nationwide
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f11photo // Shutterstock

#1. Denver County

- 2010 to 2019 population change: +127,489
--- #34 among all counties nationwide
- 2010 to 2019 percent population change: +22.1%
--- #6 among counties in Colorado, #78 among all counties nationwide
- 2019 population: 705,576
--- #1 largest county in Colorado, #90 largest county nationwide

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