Last official estimated population of Routt County was 23,426 (year 2014)[1]. This was 0.007% of total US population and 0.4% of total Colorado state population. Area of Routt County is 2,368.1 mi² (=6133.5 km²), in this year population density was 9.89 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Routt County population in 2026 would be 23,179 [0].
Historical population of Routt County for period 1880-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1880-1890] +32.69 %/yr
[1890-1900] +4.45 %/yr
[1900-1910] +7.52 %/yr
[1910-1920] +1.7 %/yr
[1920-1930] +0.44 %/yr
[1930-1940] +1.19 %/yr
[1940-1950] -1.62 %/yr
[1950-1960] -4.07 %/yr
[1960-1970] +1.12 %/yr
[1970-1980] +7.35 %/yr
[1980-1990] +0.5 %/yr
[1990-2000] +3.4 %/yr
[2000-2005] +1.69 %/yr
[2005-2010] +1.9 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Routt County? Visit this page: Settlements in Routt County, CO
Population of Routt County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 533 | 507 | 1,040 |
| 5 to 9 | 665 | 627 | 1,292 |
| 10 to 14 | 717 | 687 | 1,404 |
| 15 to 19 | 712 | 663 | 1,375 |
| 20 to 24 | 792 | 645 | 1,437 |
| 25 to 29 | 975 | 767 | 1,742 |
| 30 to 34 | 917 | 832 | 1,749 |
| 35 to 39 | 912 | 722 | 1,634 |
| 40 to 44 | 985 | 872 | 1,857 |
| 45 to 49 | 841 | 800 | 1,641 |
| 50 to 54 | 920 | 927 | 1,847 |
| 55 to 59 | 1014 | 1028 | 2,042 |
| 60 to 64 | 1017 | 855 | 1,872 |
| 65 to 69 | 707 | 657 | 1,364 |
| 70 to 74 | 396 | 324 | 720 |
| 75 to 79 | 219 | 182 | 401 |
| 80 to 84 | 106 | 109 | 215 |
| 85+ | 71 | 162 | 233 |
Routt County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 12215 | 11093 | 23,308 |
| WA | 12077 | 10930 | 23,007 |
| NH | 11618 | 10567 | 22,185 |
| NHWAC | 11399 | 10345 | 21,744 |
| NHWA | 11298 | 10214 | 21,512 |
| H | 881 | 799 | 1,680 |
| HWAC | 816 | 748 | 1,564 |
| HWA | 779 | 716 | 1,495 |
| TOM | 164 | 183 | 347 |
| AAC | 124 | 198 | 322 |
| IAC | 169 | 147 | 316 |
| NHAAC | 109 | 182 | 291 |
| NHTOM | 121 | 145 | 266 |
| BAC | 139 | 90 | 229 |
| AA | 69 | 132 | 201 |
| NHIAC | 103 | 91 | 194 |
| NHAA | 65 | 125 | 190 |
| NHBAC | 112 | 77 | 189 |
| IA | 86 | 60 | 146 |
| BA | 91 | 51 | 142 |
| NHBA | 77 | 45 | 122 |
| HIAC | 66 | 56 | 122 |
| HTOM | 43 | 38 | 81 |
| NHIA | 45 | 29 | 74 |
| HIA | 41 | 31 | 72 |
| NAC | 22 | 28 | 50 |
| NHNAC | 21 | 23 | 44 |
| HBAC | 27 | 13 | 40 |
| HAAC | 15 | 16 | 31 |
| NA | 12 | 10 | 22 |
| NHNA | 12 | 9 | 21 |
| HBA | 14 | 6 | 20 |
| HAA | 4 | 7 | 11 |
| HNAC | 1 | 5 | 6 |
| HNA | 0 | 1 | 1 |
• Larimer County population
79.7 mi,
81°
• Garfield County
78.2 mi,
218°
• Eagle County
61.2 mi,
165°
• Summit County
74.7 mi,
142°
• Pitkin County
87.6 mi,
177°
• Carbon County
84.3 mi,
1°
• Grand County
53.2 mi,
117°
• Moffat County
64.9 mi,
278°
• Rio Blanco County
73.1 mi,
241°
• Jackson County
36.7 mi,
70°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Summit Colorado Notes
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