Fastest-growing counties in Montana
Stacker
#50. Wheatland County
- 2010 to 2020 population change: -99
--- #1,629 among all counties nationwide
- 2010 to 2020 percent population change: -4.6%
--- #49 among counties in Montana, #2,254 among all counties nationwide
- 2020 population: 2,069
--- #43 largest county in Montana, #3,035 largest county nationwide
--- #1,629 among all counties nationwide
- 2010 to 2020 percent population change: -4.6%
--- #49 among counties in Montana, #2,254 among all counties nationwide
- 2020 population: 2,069
--- #43 largest county in Montana, #3,035 largest county nationwide
#49. Prairie County
- 2010 to 2020 population change: -91
--- #1,622 among all counties nationwide
- 2010 to 2020 percent population change: -7.7%
--- #53 among counties in Montana, #2,692 among all counties nationwide
- 2020 population: 1,088
--- #52 largest county in Montana, #3,103 largest county nationwide
--- #1,622 among all counties nationwide
- 2010 to 2020 percent population change: -7.7%
--- #53 among counties in Montana, #2,692 among all counties nationwide
- 2020 population: 1,088
--- #52 largest county in Montana, #3,103 largest county nationwide
#48. Daniels County
- 2010 to 2020 population change: -90
--- #1,621 among all counties nationwide
- 2010 to 2020 percent population change: -5.1%
--- #50 among counties in Montana, #2,350 among all counties nationwide
- 2020 population: 1,661
--- #49 largest county in Montana, #3,070 largest county nationwide
--- #1,621 among all counties nationwide
- 2010 to 2020 percent population change: -5.1%
--- #50 among counties in Montana, #2,350 among all counties nationwide
- 2020 population: 1,661
--- #49 largest county in Montana, #3,070 largest county nationwide
#47. Powell County
- 2010 to 2020 population change: -81
--- #1,600 among all counties nationwide
- 2010 to 2020 percent population change: -1.2%
--- #42 among counties in Montana, #1,680 among all counties nationwide
- 2020 population: 6,946
--- #30 largest county in Montana, #2,665 largest county nationwide
--- #1,600 among all counties nationwide
- 2010 to 2020 percent population change: -1.2%
--- #42 among counties in Montana, #1,680 among all counties nationwide
- 2020 population: 6,946
--- #30 largest county in Montana, #2,665 largest county nationwide
#46. Wibaux County
- 2010 to 2020 population change: -80
--- #1,597 among all counties nationwide
- 2010 to 2020 percent population change: -7.9%
--- #54 among counties in Montana, #2,704 among all counties nationwide
- 2020 population: 937
--- #53 largest county in Montana, #3,107 largest county nationwide
--- #1,597 among all counties nationwide
- 2010 to 2020 percent population change: -7.9%
--- #54 among counties in Montana, #2,704 among all counties nationwide
- 2020 population: 937
--- #53 largest county in Montana, #3,107 largest county nationwide
#45. Golden Valley County
- 2010 to 2020 population change: -61
--- #1,576 among all counties nationwide
- 2010 to 2020 percent population change: -6.9%
--- #52 among counties in Montana, #2,598 among all counties nationwide
- 2020 population: 823
--- #54 largest county in Montana, #3,114 largest county nationwide
--- #1,576 among all counties nationwide
- 2010 to 2020 percent population change: -6.9%
--- #52 among counties in Montana, #2,598 among all counties nationwide
- 2020 population: 823
--- #54 largest county in Montana, #3,114 largest county nationwide
#44. Judith Basin County
- 2010 to 2020 population change: -49
--- #1,555 among all counties nationwide
- 2010 to 2020 percent population change: -2.4%
--- #45 among counties in Montana, #1,903 among all counties nationwide
- 2020 population: 2,023
--- #44 largest county in Montana, #3,037 largest county nationwide
--- #1,555 among all counties nationwide
- 2010 to 2020 percent population change: -2.4%
--- #45 among counties in Montana, #1,903 among all counties nationwide
- 2020 population: 2,023
--- #44 largest county in Montana, #3,037 largest county nationwide
#43. Powder River County
- 2010 to 2020 population change: -49
--- #1,555 among all counties nationwide
- 2010 to 2020 percent population change: -2.8%
--- #47 among counties in Montana, #1,969 among all counties nationwide
- 2020 population: 1,694
--- #48 largest county in Montana, #3,067 largest county nationwide
--- #1,555 among all counties nationwide
- 2010 to 2020 percent population change: -2.8%
--- #47 among counties in Montana, #1,969 among all counties nationwide
- 2020 population: 1,694
--- #48 largest county in Montana, #3,067 largest county nationwide
#42. Phillips County
- 2010 to 2020 population change: -36
--- #1,537 among all counties nationwide
- 2010 to 2020 percent population change: -0.8%
--- #41 among counties in Montana, #1,622 among all counties nationwide
- 2020 population: 4,217
--- #38 largest county in Montana, #2,870 largest county nationwide
--- #1,537 among all counties nationwide
- 2010 to 2020 percent population change: -0.8%
--- #41 among counties in Montana, #1,622 among all counties nationwide
- 2020 population: 4,217
--- #38 largest county in Montana, #2,870 largest county nationwide
#41. Garfield County
- 2010 to 2020 population change: -33
--- #1,530 among all counties nationwide
- 2010 to 2020 percent population change: -2.7%
--- #46 among counties in Montana, #1,962 among all counties nationwide
- 2020 population: 1,173
--- #51 largest county in Montana, #3,099 largest county nationwide
--- #1,530 among all counties nationwide
- 2010 to 2020 percent population change: -2.7%
--- #46 among counties in Montana, #1,962 among all counties nationwide
- 2020 population: 1,173
--- #51 largest county in Montana, #3,099 largest county nationwide
#40. Dawson County
- 2010 to 2020 population change: -26
--- #1,524 among all counties nationwide
- 2010 to 2020 percent population change: -0.3%
--- #40 among counties in Montana, #1,545 among all counties nationwide
- 2020 population: 8,940
--- #25 largest county in Montana, #2,495 largest county nationwide
--- #1,524 among all counties nationwide
- 2010 to 2020 percent population change: -0.3%
--- #40 among counties in Montana, #1,545 among all counties nationwide
- 2020 population: 8,940
--- #25 largest county in Montana, #2,495 largest county nationwide
#39. Lincoln County
- 2010 to 2020 population change: -10
--- #1,502 among all counties nationwide
- 2010 to 2020 percent population change: -0.1%
--- #38 among counties in Montana, #1,498 among all counties nationwide
- 2020 population: 19,677
--- #10 largest county in Montana, #1,834 largest county nationwide
--- #1,502 among all counties nationwide
- 2010 to 2020 percent population change: -0.1%
--- #38 among counties in Montana, #1,498 among all counties nationwide
- 2020 population: 19,677
--- #10 largest county in Montana, #1,834 largest county nationwide
#38. McCone County
- 2010 to 2020 population change: -5
--- #1,498 among all counties nationwide
- 2010 to 2020 percent population change: -0.3%
--- #39 among counties in Montana, #1,544 among all counties nationwide
- 2020 population: 1,729
--- #47 largest county in Montana, #3,064 largest county nationwide
--- #1,498 among all counties nationwide
- 2010 to 2020 percent population change: -0.3%
--- #39 among counties in Montana, #1,544 among all counties nationwide
- 2020 population: 1,729
--- #47 largest county in Montana, #3,064 largest county nationwide
#37. Petroleum County
- 2010 to 2020 population change: +2
--- #1,489 among all counties nationwide
- 2010 to 2020 percent population change: +0.4%
--- #37 among counties in Montana, #1,426 among all counties nationwide
- 2020 population: 496
--- #56 largest county in Montana, #3,135 largest county nationwide
--- #1,489 among all counties nationwide
- 2010 to 2020 percent population change: +0.4%
--- #37 among counties in Montana, #1,426 among all counties nationwide
- 2020 population: 496
--- #56 largest county in Montana, #3,135 largest county nationwide
#36. Sweet Grass County
- 2010 to 2020 population change: +27
--- #1,456 among all counties nationwide
- 2010 to 2020 percent population change: +0.7%
--- #36 among counties in Montana, #1,371 among all counties nationwide
- 2020 population: 3,678
--- #39 largest county in Montana, #2,911 largest county nationwide
--- #1,456 among all counties nationwide
- 2010 to 2020 percent population change: +0.7%
--- #36 among counties in Montana, #1,371 among all counties nationwide
- 2020 population: 3,678
--- #39 largest county in Montana, #2,911 largest county nationwide
#35. Meagher County
- 2010 to 2020 population change: +36
--- #1,448 among all counties nationwide
- 2010 to 2020 percent population change: +1.9%
--- #30 among counties in Montana, #1,201 among all counties nationwide
- 2020 population: 1,927
--- #46 largest county in Montana, #3,046 largest county nationwide
--- #1,448 among all counties nationwide
- 2010 to 2020 percent population change: +1.9%
--- #30 among counties in Montana, #1,201 among all counties nationwide
- 2020 population: 1,927
--- #46 largest county in Montana, #3,046 largest county nationwide
#34. Treasure County
- 2010 to 2020 population change: +44
--- #1,437 among all counties nationwide
- 2010 to 2020 percent population change: +6.1%
--- #17 among counties in Montana, #696 among all counties nationwide
- 2020 population: 762
--- #55 largest county in Montana, #3,119 largest county nationwide
--- #1,437 among all counties nationwide
- 2010 to 2020 percent population change: +6.1%
--- #17 among counties in Montana, #696 among all counties nationwide
- 2020 population: 762
--- #55 largest county in Montana, #3,119 largest county nationwide
#33. Chouteau County
- 2010 to 2020 population change: +82
--- #1,409 among all counties nationwide
- 2010 to 2020 percent population change: +1.4%
--- #32 among counties in Montana, #1,263 among all counties nationwide
- 2020 population: 5,895
--- #34 largest county in Montana, #2,744 largest county nationwide
--- #1,409 among all counties nationwide
- 2010 to 2020 percent population change: +1.4%
--- #32 among counties in Montana, #1,263 among all counties nationwide
- 2020 population: 5,895
--- #34 largest county in Montana, #2,744 largest county nationwide
#32. Deer Lodge County
- 2010 to 2020 population change: +123
--- #1,378 among all counties nationwide
- 2010 to 2020 percent population change: +1.3%
--- #35 among counties in Montana, #1,280 among all counties nationwide
- 2020 population: 9,421
--- #22 largest county in Montana, #2,461 largest county nationwide
--- #1,378 among all counties nationwide
- 2010 to 2020 percent population change: +1.3%
--- #35 among counties in Montana, #1,280 among all counties nationwide
- 2020 population: 9,421
--- #22 largest county in Montana, #2,461 largest county nationwide
#31. Beaverhead County
- 2010 to 2020 population change: +125
--- #1,375 among all counties nationwide
- 2010 to 2020 percent population change: +1.4%
--- #33 among counties in Montana, #1,272 among all counties nationwide
- 2020 population: 9,371
--- #23 largest county in Montana, #2,465 largest county nationwide
--- #1,375 among all counties nationwide
- 2010 to 2020 percent population change: +1.4%
--- #33 among counties in Montana, #1,272 among all counties nationwide
- 2020 population: 9,371
--- #23 largest county in Montana, #2,465 largest county nationwide
#30. Teton County
- 2010 to 2020 population change: +153
--- #1,356 among all counties nationwide
- 2010 to 2020 percent population change: +2.5%
--- #28 among counties in Montana, #1,114 among all counties nationwide
- 2020 population: 6,226
--- #32 largest county in Montana, #2,720 largest county nationwide
--- #1,356 among all counties nationwide
- 2010 to 2020 percent population change: +2.5%
--- #28 among counties in Montana, #1,114 among all counties nationwide
- 2020 population: 6,226
--- #32 largest county in Montana, #2,720 largest county nationwide
#29. Sheridan County
- 2010 to 2020 population change: +155
--- #1,354 among all counties nationwide
- 2010 to 2020 percent population change: +4.6%
--- #20 among counties in Montana, #865 among all counties nationwide
- 2020 population: 3,539
--- #40 largest county in Montana, #2,917 largest county nationwide
--- #1,354 among all counties nationwide
- 2010 to 2020 percent population change: +4.6%
--- #20 among counties in Montana, #865 among all counties nationwide
- 2020 population: 3,539
--- #40 largest county in Montana, #2,917 largest county nationwide
#28. Fallon County
- 2010 to 2020 population change: +159
--- #1,351 among all counties nationwide
- 2010 to 2020 percent population change: +5.5%
--- #19 among counties in Montana, #770 among all counties nationwide
- 2020 population: 3,049
--- #42 largest county in Montana, #2,956 largest county nationwide
--- #1,351 among all counties nationwide
- 2010 to 2020 percent population change: +5.5%
--- #19 among counties in Montana, #770 among all counties nationwide
- 2020 population: 3,049
--- #42 largest county in Montana, #2,956 largest county nationwide
#27. Custer County
- 2010 to 2020 population change: +168
--- #1,347 among all counties nationwide
- 2010 to 2020 percent population change: +1.4%
--- #31 among counties in Montana, #1,260 among all counties nationwide
- 2020 population: 11,867
--- #17 largest county in Montana, #2,290 largest county nationwide
--- #1,347 among all counties nationwide
- 2010 to 2020 percent population change: +1.4%
--- #31 among counties in Montana, #1,260 among all counties nationwide
- 2020 population: 11,867
--- #17 largest county in Montana, #2,290 largest county nationwide
#26. Musselshell County
- 2010 to 2020 population change: +192
--- #1,336 among all counties nationwide
- 2010 to 2020 percent population change: +4.2%
--- #21 among counties in Montana, #903 among all counties nationwide
- 2020 population: 4,730
--- #36 largest county in Montana, #2,837 largest county nationwide
--- #1,336 among all counties nationwide
- 2010 to 2020 percent population change: +4.2%
--- #21 among counties in Montana, #903 among all counties nationwide
- 2020 population: 4,730
--- #36 largest county in Montana, #2,837 largest county nationwide
#25. Valley County
- 2010 to 2020 population change: +209
--- #1,323 among all counties nationwide
- 2010 to 2020 percent population change: +2.8%
--- #25 among counties in Montana, #1,080 among all counties nationwide
- 2020 population: 7,578
--- #28 largest county in Montana, #2,611 largest county nationwide
--- #1,323 among all counties nationwide
- 2010 to 2020 percent population change: +2.8%
--- #25 among counties in Montana, #1,080 among all counties nationwide
- 2020 population: 7,578
--- #28 largest county in Montana, #2,611 largest county nationwide
#24. Hill County
- 2010 to 2020 population change: +213
--- #1,318 among all counties nationwide
- 2010 to 2020 percent population change: +1.3%
--- #34 among counties in Montana, #1,278 among all counties nationwide
- 2020 population: 16,309
--- #12 largest county in Montana, #2,015 largest county nationwide
--- #1,318 among all counties nationwide
- 2010 to 2020 percent population change: +1.3%
--- #34 among counties in Montana, #1,278 among all counties nationwide
- 2020 population: 16,309
--- #12 largest county in Montana, #2,015 largest county nationwide
#23. Granite County
- 2010 to 2020 population change: +230
--- #1,309 among all counties nationwide
- 2010 to 2020 percent population change: +7.5%
--- #15 among counties in Montana, #599 among all counties nationwide
- 2020 population: 3,309
--- #41 largest county in Montana, #2,939 largest county nationwide
--- #1,309 among all counties nationwide
- 2010 to 2020 percent population change: +7.5%
--- #15 among counties in Montana, #599 among all counties nationwide
- 2020 population: 3,309
--- #41 largest county in Montana, #2,939 largest county nationwide
#22. Carter County
- 2010 to 2020 population change: +255
--- #1,292 among all counties nationwide
- 2010 to 2020 percent population change: +22.0%
--- #2 among counties in Montana, #89 among all counties nationwide
- 2020 population: 1,415
--- #50 largest county in Montana, #3,085 largest county nationwide
--- #1,292 among all counties nationwide
- 2010 to 2020 percent population change: +22.0%
--- #2 among counties in Montana, #89 among all counties nationwide
- 2020 population: 1,415
--- #50 largest county in Montana, #3,085 largest county nationwide
#21. Big Horn County
- 2010 to 2020 population change: +259
--- #1,289 among all counties nationwide
- 2010 to 2020 percent population change: +2.0%
--- #29 among counties in Montana, #1,182 among all counties nationwide
- 2020 population: 13,124
--- #14 largest county in Montana, #2,207 largest county nationwide
--- #1,289 among all counties nationwide
- 2010 to 2020 percent population change: +2.0%
--- #29 among counties in Montana, #1,182 among all counties nationwide
- 2020 population: 13,124
--- #14 largest county in Montana, #2,207 largest county nationwide
#20. Mineral County
- 2010 to 2020 population change: +312
--- #1,251 among all counties nationwide
- 2010 to 2020 percent population change: +7.4%
--- #16 among counties in Montana, #605 among all counties nationwide
- 2020 population: 4,535
--- #37 largest county in Montana, #2,853 largest county nationwide
--- #1,251 among all counties nationwide
- 2010 to 2020 percent population change: +7.4%
--- #16 among counties in Montana, #605 among all counties nationwide
- 2020 population: 4,535
--- #37 largest county in Montana, #2,853 largest county nationwide
#19. Roosevelt County
- 2010 to 2020 population change: +369
--- #1,220 among all counties nationwide
- 2010 to 2020 percent population change: +3.5%
--- #24 among counties in Montana, #981 among all counties nationwide
- 2020 population: 10,794
--- #20 largest county in Montana, #2,362 largest county nationwide
--- #1,220 among all counties nationwide
- 2010 to 2020 percent population change: +3.5%
--- #24 among counties in Montana, #981 among all counties nationwide
- 2020 population: 10,794
--- #20 largest county in Montana, #2,362 largest county nationwide
#18. Glacier County
- 2010 to 2020 population change: +379
--- #1,215 among all counties nationwide
- 2010 to 2020 percent population change: +2.8%
--- #26 among counties in Montana, #1,082 among all counties nationwide
- 2020 population: 13,778
--- #13 largest county in Montana, #2,168 largest county nationwide
--- #1,215 among all counties nationwide
- 2010 to 2020 percent population change: +2.8%
--- #26 among counties in Montana, #1,082 among all counties nationwide
- 2020 population: 13,778
--- #13 largest county in Montana, #2,168 largest county nationwide
#17. Carbon County
- 2010 to 2020 population change: +395
--- #1,208 among all counties nationwide
- 2010 to 2020 percent population change: +3.9%
--- #22 among counties in Montana, #936 among all counties nationwide
- 2020 population: 10,473
--- #21 largest county in Montana, #2,381 largest county nationwide
--- #1,208 among all counties nationwide
- 2010 to 2020 percent population change: +3.9%
--- #22 among counties in Montana, #936 among all counties nationwide
- 2020 population: 10,473
--- #21 largest county in Montana, #2,381 largest county nationwide
#16. Blaine County
- 2010 to 2020 population change: +553
--- #1,133 among all counties nationwide
- 2010 to 2020 percent population change: +8.5%
--- #12 among counties in Montana, #517 among all counties nationwide
- 2020 population: 7,044
--- #29 largest county in Montana, #2,654 largest county nationwide
--- #1,133 among all counties nationwide
- 2010 to 2020 percent population change: +8.5%
--- #12 among counties in Montana, #517 among all counties nationwide
- 2020 population: 7,044
--- #29 largest county in Montana, #2,654 largest county nationwide
#15. Jefferson County
- 2010 to 2020 population change: +679
--- #1,098 among all counties nationwide
- 2010 to 2020 percent population change: +6.0%
--- #18 among counties in Montana, #724 among all counties nationwide
- 2020 population: 12,085
--- #16 largest county in Montana, #2,272 largest county nationwide
--- #1,098 among all counties nationwide
- 2010 to 2020 percent population change: +6.0%
--- #18 among counties in Montana, #724 among all counties nationwide
- 2020 population: 12,085
--- #16 largest county in Montana, #2,272 largest county nationwide
#14. Madison County
- 2010 to 2020 population change: +932
--- #1,018 among all counties nationwide
- 2010 to 2020 percent population change: +12.1%
--- #6 among counties in Montana, #318 among all counties nationwide
- 2020 population: 8,623
--- #26 largest county in Montana, #2,521 largest county nationwide
--- #1,018 among all counties nationwide
- 2010 to 2020 percent population change: +12.1%
--- #6 among counties in Montana, #318 among all counties nationwide
- 2020 population: 8,623
--- #26 largest county in Montana, #2,521 largest county nationwide
#13. Silver Bow County
- 2010 to 2020 population change: +933
--- #1,017 among all counties nationwide
- 2010 to 2020 percent population change: +2.7%
--- #27 among counties in Montana, #1,091 among all counties nationwide
- 2020 population: 35,133
--- #8 largest county in Montana, #1,299 largest county nationwide
--- #1,017 among all counties nationwide
- 2010 to 2020 percent population change: +2.7%
--- #27 among counties in Montana, #1,091 among all counties nationwide
- 2020 population: 35,133
--- #8 largest county in Montana, #1,299 largest county nationwide
#12. Sanders County
- 2010 to 2020 population change: +987
--- #1,002 among all counties nationwide
- 2010 to 2020 percent population change: +8.6%
--- #11 among counties in Montana, #506 among all counties nationwide
- 2020 population: 12,400
--- #15 largest county in Montana, #2,248 largest county nationwide
--- #1,002 among all counties nationwide
- 2010 to 2020 percent population change: +8.6%
--- #11 among counties in Montana, #506 among all counties nationwide
- 2020 population: 12,400
--- #15 largest county in Montana, #2,248 largest county nationwide
#11. Broadwater County
- 2010 to 2020 population change: +1,162
--- #966 among all counties nationwide
- 2010 to 2020 percent population change: +20.7%
--- #3 among counties in Montana, #102 among all counties nationwide
- 2020 population: 6,774
--- #31 largest county in Montana, #2,674 largest county nationwide
--- #966 among all counties nationwide
- 2010 to 2020 percent population change: +20.7%
--- #3 among counties in Montana, #102 among all counties nationwide
- 2020 population: 6,774
--- #31 largest county in Montana, #2,674 largest county nationwide
#10. Park County
- 2010 to 2020 population change: +1,555
--- #891 among all counties nationwide
- 2010 to 2020 percent population change: +9.9%
--- #9 among counties in Montana, #424 among all counties nationwide
- 2020 population: 17,191
--- #11 largest county in Montana, #1,957 largest county nationwide
--- #891 among all counties nationwide
- 2010 to 2020 percent population change: +9.9%
--- #9 among counties in Montana, #424 among all counties nationwide
- 2020 population: 17,191
--- #11 largest county in Montana, #1,957 largest county nationwide
#9. Richland County
- 2010 to 2020 population change: +1,745
--- #857 among all counties nationwide
- 2010 to 2020 percent population change: +17.9%
--- #4 among counties in Montana, #151 among all counties nationwide
- 2020 population: 11,491
--- #18 largest county in Montana, #2,317 largest county nationwide
--- #857 among all counties nationwide
- 2010 to 2020 percent population change: +17.9%
--- #4 among counties in Montana, #151 among all counties nationwide
- 2020 population: 11,491
--- #18 largest county in Montana, #2,317 largest county nationwide
#8. Lake County
- 2010 to 2020 population change: +2,388
--- #764 among all counties nationwide
- 2010 to 2020 percent population change: +8.3%
--- #13 among counties in Montana, #535 among all counties nationwide
- 2020 population: 31,134
--- #9 largest county in Montana, #1,396 largest county nationwide
--- #764 among all counties nationwide
- 2010 to 2020 percent population change: +8.3%
--- #13 among counties in Montana, #535 among all counties nationwide
- 2020 population: 31,134
--- #9 largest county in Montana, #1,396 largest county nationwide
#7. Cascade County
- 2010 to 2020 population change: +3,087
--- #695 among all counties nationwide
- 2010 to 2020 percent population change: +3.8%
--- #23 among counties in Montana, #954 among all counties nationwide
- 2020 population: 84,414
--- #5 largest county in Montana, #681 largest county nationwide
--- #695 among all counties nationwide
- 2010 to 2020 percent population change: +3.8%
--- #23 among counties in Montana, #954 among all counties nationwide
- 2020 population: 84,414
--- #5 largest county in Montana, #681 largest county nationwide
#6. Ravalli County
- 2010 to 2020 population change: +3,962
--- #630 among all counties nationwide
- 2010 to 2020 percent population change: +9.9%
--- #10 among counties in Montana, #431 among all counties nationwide
- 2020 population: 44,174
--- #7 largest county in Montana, #1,094 largest county nationwide
--- #630 among all counties nationwide
- 2010 to 2020 percent population change: +9.9%
--- #10 among counties in Montana, #431 among all counties nationwide
- 2020 population: 44,174
--- #7 largest county in Montana, #1,094 largest county nationwide
#5. Lewis and Clark County
- 2010 to 2020 population change: +7,578
--- #498 among all counties nationwide
- 2010 to 2020 percent population change: +12.0%
--- #7 among counties in Montana, #326 among all counties nationwide
- 2020 population: 70,973
--- #6 largest county in Montana, #767 largest county nationwide
--- #498 among all counties nationwide
- 2010 to 2020 percent population change: +12.0%
--- #7 among counties in Montana, #326 among all counties nationwide
- 2020 population: 70,973
--- #6 largest county in Montana, #767 largest county nationwide
#4. Missoula County
- 2010 to 2020 population change: +8,623
--- #461 among all counties nationwide
- 2010 to 2020 percent population change: +7.9%
--- #14 among counties in Montana, #574 among all counties nationwide
- 2020 population: 117,922
--- #3 largest county in Montana, #533 largest county nationwide
--- #461 among all counties nationwide
- 2010 to 2020 percent population change: +7.9%
--- #14 among counties in Montana, #574 among all counties nationwide
- 2020 population: 117,922
--- #3 largest county in Montana, #533 largest county nationwide
#3. Flathead County
- 2010 to 2020 population change: +13,429
--- #365 among all counties nationwide
- 2010 to 2020 percent population change: +14.8%
--- #5 among counties in Montana, #233 among all counties nationwide
- 2020 population: 104,357
--- #4 largest county in Montana, #584 largest county nationwide
--- #365 among all counties nationwide
- 2010 to 2020 percent population change: +14.8%
--- #5 among counties in Montana, #233 among all counties nationwide
- 2020 population: 104,357
--- #4 largest county in Montana, #584 largest county nationwide
#2. Yellowstone County
- 2010 to 2020 population change: +16,759
--- #326 among all counties nationwide
- 2010 to 2020 percent population change: +11.3%
--- #8 among counties in Montana, #356 among all counties nationwide
- 2020 population: 164,731
--- #1 largest county in Montana, #406 largest county nationwide
--- #326 among all counties nationwide
- 2010 to 2020 percent population change: +11.3%
--- #8 among counties in Montana, #356 among all counties nationwide
- 2020 population: 164,731
--- #1 largest county in Montana, #406 largest county nationwide
#1. Gallatin County
- 2010 to 2020 population change: +29,447
--- #220 among all counties nationwide
- 2010 to 2020 percent population change: +32.9%
--- #1 among counties in Montana, #28 among all counties nationwide
- 2020 population: 118,960
--- #2 largest county in Montana, #528 largest county nationwide
--- #220 among all counties nationwide
- 2010 to 2020 percent population change: +32.9%
--- #1 among counties in Montana, #28 among all counties nationwide
- 2020 population: 118,960
--- #2 largest county in Montana, #528 largest county nationwide
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