RANKING · 2000 CENSUS · 63 SHOWN OF 63

Most population lost, Colorado counties · 2000

Colorado counties that lost 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 gained Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01San Juan County, COCO813-187–

02Cheyenne County, COCO1,713-166–

03Kiowa County, COCO1,412-66–

04Baca County, COCO3,347-39–

05Jackson County, COCO1,211-28–

06Rio Blanco County, COCO6,683+14–

07Sedgwick County, COCO2,247+57–

08Washington County, COCO4,732+114–

09Otero County, COCO17,683+126–

10Mineral County, COCO910+273–

11Phillips County, COCO4,420+291–

12Hinsdale County, COCO753+323–

13Dolores County, COCO2,466+340–

14Costilla County, COCO3,679+473–

15Kit Carson County, COCO7,069+871–

16Yuma County, COCO9,896+887–

17Conejos County, COCO7,529+947–

18Bent County, COCO5,716+950–

19Prowers County, COCO11,884+1,136–

20Saguache County, COCO6,732+1,298–

21Alamosa County, COCO16,688+1,349–

22Las Animas County, COCO14,391+1,442–

23Ouray County, COCO5,265+1,447–

24Lincoln County, COCO5,645+1,558–

25Crowley County, COCO5,677+1,572–

26Custer County, COCO5,590+1,577–

27Rio Grande County, COCO11,087+1,643–

28Gilpin County, COCO6,073+1,687–

29Clear Creek County, COCO8,994+1,703–

30Lake County, COCO7,552+1,805–

31Moffat County, COCO13,122+1,827–

32Huerfano County, COCO7,011+1,853–

33Pitkin County, COCO16,625+2,211–

34Logan County, COCO20,654+2,937–

35San Miguel County, COCO7,753+2,941–

36Chaffee County, COCO20,831+3,558–

37Gunnison County, COCO17,439+3,683–

38Grand County, COCO16,496+4,476–

39Archuleta County, COCO14,306+4,553–

40Montezuma County, COCO26,678+5,158–

41Morgan County, COCO30,306+5,232–

42Routt County, COCO25,329+5,602–

43Delta County, COCO32,178+6,854–

44Park County, COCO18,314+7,349–

45Teller County, COCO24,756+8,087–

46Montrose County, COCO44,591+9,009–

47Elbert County, COCO30,534+10,226–

48Summit County, COCO31,517+10,667–

49La Plata County, COCO56,898+11,657–

50Garfield County, COCO63,474+13,817–

51Fremont County, COCO50,039+13,872–

52Pueblo County, COCO169,277+18,421–

53Eagle County, COCO54,291+19,731–

54Mesa County, COCO162,845+23,110–

55Weld County, COCO378,426+49,115–

56Larimer County, COCO377,292+65,358–

57Boulder County, COCO328,560+65,949–

58Denver County, COCO740,613+87,026–

59Jefferson County, COCO580,451+88,626–

60Arapahoe County, COCO673,820+96,456–

61Adams County, COCO554,668+98,819–

62Douglas County, COCO399,396+115,375–

63El Paso County, COCO757,040+119,915–

SHOWING 1–63 OF 63

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