RANKING · 2000 CENSUS · 63 SHOWN OF 63

Most population gained, Colorado counties · 2000

Colorado counties that added the most residents from the 1990 census to 2000, by raw count of people rather than percentage. This list covers the 63 counties in Colorado that qualify, ranked against each other statewide. The median across all 63 is +1,853.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01El Paso County, COCO757,040+119,915–

02Douglas County, COCO399,396+115,375–

03Adams County, COCO554,668+98,819–

04Arapahoe County, COCO673,820+96,456–

05Jefferson County, COCO580,451+88,626–

06Denver County, COCO740,613+87,026–

07Boulder County, COCO328,560+65,949–

08Larimer County, COCO377,292+65,358–

09Weld County, COCO378,426+49,115–

10Mesa County, COCO162,845+23,110–

11Eagle County, COCO54,291+19,731–

12Pueblo County, COCO169,277+18,421–

13Fremont County, COCO50,039+13,872–

14Garfield County, COCO63,474+13,817–

15La Plata County, COCO56,898+11,657–

16Summit County, COCO31,517+10,667–

17Elbert County, COCO30,534+10,226–

18Montrose County, COCO44,591+9,009–

19Teller County, COCO24,756+8,087–

20Park County, COCO18,314+7,349–

21Delta County, COCO32,178+6,854–

22Routt County, COCO25,329+5,602–

23Morgan County, COCO30,306+5,232–

24Montezuma County, COCO26,678+5,158–

25Archuleta County, COCO14,306+4,553–

26Grand County, COCO16,496+4,476–

27Gunnison County, COCO17,439+3,683–

28Chaffee County, COCO20,831+3,558–

29San Miguel County, COCO7,753+2,941–

30Logan County, COCO20,654+2,937–

31Pitkin County, COCO16,625+2,211–

32Huerfano County, COCO7,011+1,853–

33Moffat County, COCO13,122+1,827–

34Lake County, COCO7,552+1,805–

35Clear Creek County, COCO8,994+1,703–

36Gilpin County, COCO6,073+1,687–

37Rio Grande County, COCO11,087+1,643–

38Custer County, COCO5,590+1,577–

39Crowley County, COCO5,677+1,572–

40Lincoln County, COCO5,645+1,558–

41Ouray County, COCO5,265+1,447–

42Las Animas County, COCO14,391+1,442–

43Alamosa County, COCO16,688+1,349–

44Saguache County, COCO6,732+1,298–

45Prowers County, COCO11,884+1,136–

46Bent County, COCO5,716+950–

47Conejos County, COCO7,529+947–

48Yuma County, COCO9,896+887–

49Kit Carson County, COCO7,069+871–

50Costilla County, COCO3,679+473–

51Dolores County, COCO2,466+340–

52Hinsdale County, COCO753+323–

53Phillips County, COCO4,420+291–

54Mineral County, COCO910+273–

55Otero County, COCO17,683+126–

56Washington County, COCO4,732+114–

57Sedgwick County, COCO2,247+57–

58Rio Blanco County, COCO6,683+14–

59Jackson County, COCO1,211-28–

60Baca County, COCO3,347-39–

61Kiowa County, COCO1,412-66–

62Cheyenne County, COCO1,713-166–

63San Juan County, COCO813-187–

SHOWING 1–63 OF 63

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS