Fastest-growing counties in Colorado

Written by:
July 1, 2022
f11photo // Shutterstock

Fastest-growing counties in Colorado

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 Colorado. 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 2020, based on the U.S. Decennial Census.

You may also like: Biggest sources of immigrants to Colorado

1 / 50
Jeffrey Beall // Wikimedia Commons

#50. Costilla County

- 2010 to 2020 population change: -25
--- #1,519 among all counties nationwide
- 2010 to 2020 percent population change: -0.7%
--- #50 among counties in Colorado, #1,595 among all counties nationwide
- 2020 population: 3,499
--- #56 largest county in Colorado, #2,922 largest county nationwide
2 / 50
Wusel007 // Wikimedia Commons

#49. Jackson County

- 2010 to 2020 population change: -15
--- #1,507 among all counties nationwide
- 2010 to 2020 percent population change: -1.1%
--- #52 among counties in Colorado, #1,663 among all counties nationwide
- 2020 population: 1,379
--- #61 largest county in Colorado, #3,087 largest county nationwide
3 / 50
Jeffrey Beall // Wikimedia Commons

#48. Washington County

- 2010 to 2020 population change: +3
--- #1,488 among all counties nationwide
- 2010 to 2020 percent population change: +0.1%
--- #48 among counties in Colorado, #1,479 among all counties nationwide
- 2020 population: 4,817
--- #52 largest county in Colorado, #2,835 largest county nationwide
4 / 50
JERRYE AND ROY KLOTZ MD // Wikimedia Commons

#47. San Juan County

- 2010 to 2020 population change: +6
--- #1,482 among all counties nationwide
- 2010 to 2020 percent population change: +0.9%
--- #46 among counties in Colorado, #1,355 among all counties nationwide
- 2020 population: 705
--- #64 largest county in Colorado, #3,126 largest county nationwide
5 / 50
Calvin Beale // Wikimedia Commons

#46. Sedgwick County

- 2010 to 2020 population change: +25
--- #1,459 among all counties nationwide
- 2010 to 2020 percent population change: +1.1%
--- #45 among counties in Colorado, #1,329 among all counties nationwide
- 2020 population: 2,404
--- #57 largest county in Colorado, #3,008 largest county nationwide

You may also like: Where people in Colorado are moving to most

6 / 50
Aualliso // Wikimedia Commons

#45. Kiowa County

- 2010 to 2020 population change: +48
--- #1,433 among all counties nationwide
- 2010 to 2020 percent population change: +3.4%
--- #35 among counties in Colorado, #998 among all counties nationwide
- 2020 population: 1,446
--- #60 largest county in Colorado, #3,079 largest county nationwide
7 / 50
Jeffrey Beall // Wikimedia Commons

#44. Phillips County

- 2010 to 2020 population change: +88
--- #1,405 among all counties nationwide
- 2010 to 2020 percent population change: +2.0%
--- #39 among counties in Colorado, #1,185 among all counties nationwide
- 2020 population: 4,530
--- #54 largest county in Colorado, #2,854 largest county nationwide
8 / 50
Jeffrey Beall // Wikimedia Commons

#43. Crowley County

- 2010 to 2020 population change: +99
--- #1,396 among all counties nationwide
- 2010 to 2020 percent population change: +1.7%
--- #41 among counties in Colorado, #1,226 among all counties nationwide
- 2020 population: 5,922
--- #47 largest county in Colorado, #2,740 largest county nationwide
9 / 50
Jeffrey Beall // Wikimedia Commons

#42. Huerfano County

- 2010 to 2020 population change: +109
--- #1,387 among all counties nationwide
- 2010 to 2020 percent population change: +1.6%
--- #42 among counties in Colorado, #1,239 among all counties nationwide
- 2020 population: 6,820
--- #44 largest county in Colorado, #2,671 largest county nationwide
10 / 50
Daniel Schwen // Wikimedia Commons

#41. Lake County

- 2010 to 2020 population change: +126
--- #1,374 among all counties nationwide
- 2010 to 2020 percent population change: +1.7%
--- #40 among counties in Colorado, #1,224 among all counties nationwide
- 2020 population: 7,436
--- #42 largest county in Colorado, #2,626 largest county nationwide

You may also like: Famous actresses from Colorado

11 / 50
Canva

#40. Mineral County

- 2010 to 2020 population change: +153
--- #1,356 among all counties nationwide
- 2010 to 2020 percent population change: +21.5%
--- #4 among counties in Colorado, #92 among all counties nationwide
- 2020 population: 865
--- #62 largest county in Colorado, #3,110 largest county nationwide
12 / 50
Ammodramus // Wikimedia Commons

#39. Lincoln County

- 2010 to 2020 population change: +208
--- #1,325 among all counties nationwide
- 2010 to 2020 percent population change: +3.8%
--- #34 among counties in Colorado, #952 among all counties nationwide
- 2020 population: 5,675
--- #49 largest county in Colorado, #2,763 largest county nationwide
13 / 50
Canva

#38. Pitkin County

- 2010 to 2020 population change: +210
--- #1,321 among all counties nationwide
- 2010 to 2020 percent population change: +1.2%
--- #44 among counties in Colorado, #1,303 among all counties nationwide
- 2020 population: 17,358
--- #29 largest county in Colorado, #1,946 largest county nationwide
14 / 50
Originalgum // Wikimedia Commons

#37. Delta County

- 2010 to 2020 population change: +244
--- #1,304 among all counties nationwide
- 2010 to 2020 percent population change: +0.8%
--- #47 among counties in Colorado, #1,365 among all counties nationwide
- 2020 population: 31,196
--- #18 largest county in Colorado, #1,392 largest county nationwide
15 / 50
Jeffrey Beall // Wikimedia Commons

#36. Saguache County

- 2010 to 2020 population change: +260
--- #1,288 among all counties nationwide
- 2010 to 2020 percent population change: +4.3%
--- #33 among counties in Colorado, #902 among all counties nationwide
- 2020 population: 6,368
--- #46 largest county in Colorado, #2,709 largest county nationwide

You may also like: Highest-rated Class of 2022 football recruits from Colorado

16 / 50
Acroterion // Wikimedia Commons

#35. Dolores County

- 2010 to 2020 population change: +262
--- #1,285 among all counties nationwide
- 2010 to 2020 percent population change: +12.7%
--- #11 among counties in Colorado, #299 among all counties nationwide
- 2020 population: 2,326
--- #58 largest county in Colorado, #3,014 largest county nationwide
17 / 50
Dsdugan // Wikimedia Commons

#34. Clear Creek County

- 2010 to 2020 population change: +309
--- #1,255 among all counties nationwide
- 2010 to 2020 percent population change: +3.4%
--- #36 among counties in Colorado, #1,004 among all counties nationwide
- 2020 population: 9,397
--- #39 largest county in Colorado, #2,462 largest county nationwide
18 / 50
Jeffrey Beall // Wikimedia Commons

#33. Montezuma County

- 2010 to 2020 population change: +314
--- #1,248 among all counties nationwide
- 2010 to 2020 percent population change: +1.2%
--- #43 among counties in Colorado, #1,300 among all counties nationwide
- 2020 population: 25,849
--- #22 largest county in Colorado, #1,565 largest county nationwide
19 / 50
Jeffrey Beall // Wikimedia Commons

#32. Gilpin County

- 2010 to 2020 population change: +367
--- #1,221 among all counties nationwide
- 2010 to 2020 percent population change: +6.7%
--- #25 among counties in Colorado, #651 among all counties nationwide
- 2020 population: 5,808
--- #48 largest county in Colorado, #2,750 largest county nationwide
20 / 50
Ken Lund from Las Vegas, Nevada, USA // Wikimedia Commons

#31. Ouray County

- 2010 to 2020 population change: +438
--- #1,183 among all counties nationwide
- 2010 to 2020 percent population change: +9.9%
--- #17 among counties in Colorado, #428 among all counties nationwide
- 2020 population: 4,874
--- #51 largest county in Colorado, #2,831 largest county nationwide

You may also like: Fastest growing cities in Colorado

21 / 50
Jeffrey Beall // Wikimedia Commons

#30. Custer County

- 2010 to 2020 population change: +449
--- #1,171 among all counties nationwide
- 2010 to 2020 percent population change: +10.6%
--- #14 among counties in Colorado, #389 among all counties nationwide
- 2020 population: 4,704
--- #53 largest county in Colorado, #2,839 largest county nationwide
22 / 50
JERREYE AND ROYKLOTZ MD // Wikimedia Commons

#29. San Miguel County

- 2010 to 2020 population change: +713
--- #1,086 among all counties nationwide
- 2010 to 2020 percent population change: +9.7%
--- #18 among counties in Colorado, #442 among all counties nationwide
- 2020 population: 8,072
--- #40 largest county in Colorado, #2,572 largest county nationwide
23 / 50
Jeffrey Beall // Wikimedia Commons

#28. Grand County

- 2010 to 2020 population change: +874
--- #1,033 among all counties nationwide
- 2010 to 2020 percent population change: +5.9%
--- #28 among counties in Colorado, #728 among all counties nationwide
- 2020 population: 15,717
--- #32 largest county in Colorado, #2,045 largest county nationwide
24 / 50
Milan Suvajac // Wikimedia Commons

#27. Alamosa County

- 2010 to 2020 population change: +931
--- #1,019 among all counties nationwide
- 2010 to 2020 percent population change: +6.0%
--- #27 among counties in Colorado, #712 among all counties nationwide
- 2020 population: 16,376
--- #31 largest county in Colorado, #2,011 largest county nationwide
25 / 50
Jeffrey Beall // Wikimedia Commons

#26. Morgan County

- 2010 to 2020 population change: +952
--- #1,012 among all counties nationwide
- 2010 to 2020 percent population change: +3.4%
--- #38 among counties in Colorado, #1,007 among all counties nationwide
- 2020 population: 29,111
--- #20 largest county in Colorado, #1,451 largest county nationwide

You may also like: Lowest-earning counties in Colorado

26 / 50
Thomson200 // Wikimedia Commons

#25. Park County

- 2010 to 2020 population change: +1,184
--- #963 among all counties nationwide
- 2010 to 2020 percent population change: +7.3%
--- #23 among counties in Colorado, #608 among all counties nationwide
- 2020 population: 17,390
--- #28 largest county in Colorado, #1,945 largest county nationwide
27 / 50
Milan Suvajac // Wikimedia Commons

#24. Archuleta County

- 2010 to 2020 population change: +1,275
--- #951 among all counties nationwide
- 2010 to 2020 percent population change: +10.6%
--- #15 among counties in Colorado, #390 among all counties nationwide
- 2020 population: 13,359
--- #34 largest county in Colorado, #2,192 largest county nationwide
28 / 50
Canva

#23. Routt County

- 2010 to 2020 population change: +1,320
--- #944 among all counties nationwide
- 2010 to 2020 percent population change: +5.6%
--- #31 among counties in Colorado, #759 among all counties nationwide
- 2020 population: 24,829
--- #23 largest county in Colorado, #1,608 largest county nationwide
29 / 50
David Shankbone // Wikimedia Commons

#22. Teller County

- 2010 to 2020 population change: +1,360
--- #934 among all counties nationwide
- 2010 to 2020 percent population change: +5.8%
--- #29 among counties in Colorado, #739 among all counties nationwide
- 2020 population: 24,710
--- #24 largest county in Colorado, #1,617 largest county nationwide
30 / 50
Jeffrey Beall from Colorado, USA // Wikimedia Commons

#21. Montrose County

- 2010 to 2020 population change: +1,403
--- #927 among all counties nationwide
- 2010 to 2020 percent population change: +3.4%
--- #37 among counties in Colorado, #1,005 among all counties nationwide
- 2020 population: 42,679
--- #17 largest county in Colorado, #1,129 largest county nationwide

You may also like: Counties with the highest COVID-19 vaccination rate in Colorado

31 / 50
The Greater Southwestern Exploration Company from Long Beach, California, United States // Wikimedia Commons

#20. Gunnison County

- 2010 to 2020 population change: +1,594
--- #885 among all counties nationwide
- 2010 to 2020 percent population change: +10.4%
--- #16 among counties in Colorado, #396 among all counties nationwide
- 2020 population: 16,918
--- #30 largest county in Colorado, #1,974 largest county nationwide
32 / 50
Jeffrey Beall // Wikimedia Commons

#19. Chaffee County

- 2010 to 2020 population change: +1,667
--- #871 among all counties nationwide
- 2010 to 2020 percent population change: +9.4%
--- #20 among counties in Colorado, #459 among all counties nationwide
- 2020 population: 19,476
--- #26 largest county in Colorado, #1,851 largest county nationwide
33 / 50
Jeffrey Beall // Wikimedia Commons

#18. Fremont County

- 2010 to 2020 population change: +2,115
--- #802 among all counties nationwide
- 2010 to 2020 percent population change: +4.5%
--- #32 among counties in Colorado, #876 among all counties nationwide
- 2020 population: 48,939
--- #16 largest county in Colorado, #1,007 largest county nationwide
34 / 50
Jeffrey Beall // Wikimedia Commons

#17. Elbert County

- 2010 to 2020 population change: +2,976
--- #711 among all counties nationwide
- 2010 to 2020 percent population change: +12.9%
--- #10 among counties in Colorado, #294 among all counties nationwide
- 2020 population: 26,062
--- #21 largest county in Colorado, #1,555 largest county nationwide
35 / 50
Canva

#16. Summit County

- 2010 to 2020 population change: +3,061
--- #697 among all counties nationwide
- 2010 to 2020 percent population change: +10.9%
--- #13 among counties in Colorado, #369 among all counties nationwide
- 2020 population: 31,055
--- #19 largest county in Colorado, #1,399 largest county nationwide

You may also like: Cities with the most expensive homes in Colorado

36 / 50
Jeffrey Beall // Wikimedia Commons

#15. Eagle County

- 2010 to 2020 population change: +3,534
--- #660 among all counties nationwide
- 2010 to 2020 percent population change: +6.8%
--- #24 among counties in Colorado, #649 among all counties nationwide
- 2020 population: 55,731
--- #14 largest county in Colorado, #922 largest county nationwide
37 / 50
Canva

#14. La Plata County

- 2010 to 2020 population change: +4,304
--- #602 among all counties nationwide
- 2010 to 2020 percent population change: +8.4%
--- #22 among counties in Colorado, #529 among all counties nationwide
- 2020 population: 55,638
--- #15 largest county in Colorado, #925 largest county nationwide
38 / 50
GSpics // Wikimedia Commons

#13. Garfield County

- 2010 to 2020 population change: +5,296
--- #556 among all counties nationwide
- 2010 to 2020 percent population change: +9.4%
--- #19 among counties in Colorado, #456 among all counties nationwide
- 2020 population: 61,685
--- #13 largest county in Colorado, #860 largest county nationwide
39 / 50
Eleaf // Wikimedia Commons

#12. Mesa County

- 2010 to 2020 population change: +8,980
--- #452 among all counties nationwide
- 2010 to 2020 percent population change: +6.1%
--- #26 among counties in Colorado, #697 among all counties nationwide
- 2020 population: 155,703
--- #11 largest county in Colorado, #435 largest county nationwide
40 / 50
John Wark // Wikicommons

#11. Pueblo County

- 2010 to 2020 population change: +9,099
--- #447 among all counties nationwide
- 2010 to 2020 percent population change: +5.7%
--- #30 among counties in Colorado, #747 among all counties nationwide
- 2020 population: 168,162
--- #10 largest county in Colorado, #401 largest county nationwide

You may also like: Counties with the highest COVID-19 death rate in Colorado

41 / 50
Canva

#10. Broomfield County

- 2010 to 2020 population change: +18,223
--- #310 among all counties nationwide
- 2010 to 2020 percent population change: +32.6%
--- #1 among counties in Colorado, #30 among all counties nationwide
- 2020 population: 74,112
--- #12 largest county in Colorado, #748 largest county nationwide
42 / 50
Maciej Bledowski // Shutterstock

#9. Boulder County

- 2010 to 2020 population change: +36,191
--- #178 among all counties nationwide
- 2010 to 2020 percent population change: +12.3%
--- #12 among counties in Colorado, #310 among all counties nationwide
- 2020 population: 330,758
--- #8 largest county in Colorado, #216 largest county nationwide
43 / 50
Yassie // Wikimedia Commons

#8. Jefferson County

- 2010 to 2020 population change: +48,367
--- #134 among all counties nationwide
- 2010 to 2020 percent population change: +9.0%
--- #21 among counties in Colorado, #481 among all counties nationwide
- 2020 population: 582,910
--- #4 largest county in Colorado, #118 largest county nationwide
44 / 50
Citycommunications // Wikicommons

#7. Larimer County

- 2010 to 2020 population change: +59,436
--- #106 among all counties nationwide
- 2010 to 2020 percent population change: +19.8%
--- #5 among counties in Colorado, #123 among all counties nationwide
- 2020 population: 359,066
--- #6 largest county in Colorado, #202 largest county nationwide
45 / 50
Billy Hathorn // Wikimedia Commons

#6. Douglas County

- 2010 to 2020 population change: +72,513
--- #83 among all counties nationwide
- 2010 to 2020 percent population change: +25.4%
--- #3 among counties in Colorado, #62 among all counties nationwide
- 2020 population: 357,978
--- #7 largest county in Colorado, #203 largest county nationwide

You may also like: Highest-earning cities in Colorado

46 / 50
Peter Romero // Wikimedia Commons

#5. Weld County

- 2010 to 2020 population change: +76,156
--- #76 among all counties nationwide
- 2010 to 2020 percent population change: +30.1%
--- #2 among counties in Colorado, #37 among all counties nationwide
- 2020 population: 328,981
--- #9 largest county in Colorado, #218 largest county nationwide
47 / 50
Bdearthco // Wikimedia Commons

#4. Adams County

- 2010 to 2020 population change: +77,969
--- #71 among all counties nationwide
- 2010 to 2020 percent population change: +17.7%
--- #7 among counties in Colorado, #153 among all counties nationwide
- 2020 population: 519,572
--- #5 largest county in Colorado, #139 largest county nationwide
48 / 50
Mountain Mike Johans // Wikimedia Commons

#3. Arapahoe County

- 2010 to 2020 population change: +83,067
--- #62 among all counties nationwide
- 2010 to 2020 percent population change: +14.5%
--- #9 among counties in Colorado, #238 among all counties nationwide
- 2020 population: 655,070
--- #3 largest county in Colorado, #106 largest county nationwide
49 / 50
Robert Corby // Wikimedia Commons

#2. El Paso County

- 2010 to 2020 population change: +108,132
--- #48 among all counties nationwide
- 2010 to 2020 percent population change: +17.4%
--- #8 among counties in Colorado, #157 among all counties nationwide
- 2020 population: 730,395
--- #1 largest county in Colorado, #90 largest county nationwide
50 / 50
f11photo // Shutterstock

#1. Denver County

- 2010 to 2020 population change: +115,364
--- #44 among all counties nationwide
- 2010 to 2020 percent population change: +19.2%
--- #6 among counties in Colorado, #128 among all counties nationwide
- 2020 population: 715,522
--- #2 largest county in Colorado, #96 largest county nationwide

You may also like: Counties with the most renters in Colorado

Trending Now