Last official estimated population of Rio Blanco County was 6,660 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Colorado state population. Area of Rio Blanco County is 3,222.9 mi² (=8347.2 km²), in this year population density was 2.07 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Rio Blanco County population in 2026 would be 6,642 [0].
Historical population of Rio Blanco County for period 1890-2014 [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
[1890-1900] +3.48 %/yr
[1900-1910] +3.27 %/yr
[1910-1920] +3 %/yr
[1920-1930] -0.51 %/yr
[1930-1940] -0.12 %/yr
[1940-1950] +4.83 %/yr
[1950-1960] +0.88 %/yr
[1960-1970] -0.61 %/yr
[1970-1980] +2.59 %/yr
[1980-1990] -0.33 %/yr
[1990-2000] -0.1 %/yr
[2000-2005] -0.16 %/yr
[2005-2010] +2.32 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Rio Blanco County? Visit this page: Settlements in Rio Blanco County, CO
Population of Rio Blanco County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 243 | 212 | 455 |
| 5 to 9 | 260 | 249 | 509 |
| 10 to 14 | 232 | 201 | 433 |
| 15 to 19 | 259 | 257 | 516 |
| 20 to 24 | 254 | 195 | 449 |
| 25 to 29 | 232 | 218 | 450 |
| 30 to 34 | 238 | 207 | 445 |
| 35 to 39 | 208 | 169 | 377 |
| 40 to 44 | 189 | 191 | 380 |
| 45 to 49 | 195 | 171 | 366 |
| 50 to 54 | 241 | 247 | 488 |
| 55 to 59 | 267 | 259 | 526 |
| 60 to 64 | 222 | 175 | 397 |
| 65 to 69 | 154 | 154 | 308 |
| 70 to 74 | 118 | 115 | 233 |
| 75 to 79 | 75 | 86 | 161 |
| 80 to 84 | 50 | 52 | 102 |
| 85+ | 44 | 68 | 112 |
Rio Blanco 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 | 3351 | 3120 | 6,471 |
| WA | 3278 | 3043 | 6,321 |
| NH | 3056 | 2908 | 5,964 |
| NHWAC | 2950 | 2815 | 5,765 |
| NHWA | 2888 | 2753 | 5,641 |
| H | 425 | 318 | 743 |
| HWAC | 401 | 305 | 706 |
| HWA | 390 | 290 | 680 |
| IAC | 102 | 81 | 183 |
| TOM | 80 | 84 | 164 |
| NHIAC | 76 | 65 | 141 |
| NHTOM | 67 | 66 | 133 |
| BAC | 67 | 50 | 117 |
| IA | 63 | 39 | 102 |
| NHBAC | 61 | 41 | 102 |
| AAC | 33 | 53 | 86 |
| NHAAC | 29 | 47 | 76 |
| BA | 44 | 30 | 74 |
| NHIA | 42 | 31 | 73 |
| NHBA | 44 | 28 | 72 |
| HIAC | 26 | 16 | 42 |
| AA | 12 | 24 | 36 |
| NHAA | 11 | 24 | 35 |
| HTOM | 13 | 18 | 31 |
| HIA | 21 | 8 | 29 |
| NAC | 11 | 10 | 21 |
| NHNAC | 10 | 9 | 19 |
| HBAC | 6 | 9 | 15 |
| HAAC | 4 | 6 | 10 |
| NA | 4 | 6 | 10 |
| NHNA | 4 | 6 | 10 |
| HNAC | 1 | 1 | 2 |
| HBA | 0 | 2 | 2 |
| HAA | 1 | 0 | 1 |
| HNA | 0 | 0 | 0 |
• Mesa County population
67.3 mi, 
191°
• Garfield County
30.1 mi, 
149°
• Eagle County
83.4 mi, 
106°
• Uintah County
70.5 mi, 
278°
• Delta County
78.8 mi, 
166°
• Routt County
73.1 mi, 
61°
• Pitkin County
86 mi, 
127°
• Moffat County
44.5 mi, 
359°
• Grand County
100.6 mi, 
226°
• Daggett County
93.4 mi, 
312°
[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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