Last official estimated population of Boulder County was 295,967 (year 2014)[1]. This was 0.093% of total US population and 5.4% of total Colorado state population. Area of Boulder County is 740.5 mi² (=1917.8 km²), in this year population density was 399.70 p/mi². If population growth rate would be same as in period 2010-2014 (+0.12%/yr), Boulder County population in 2024 would be 299,496 [0].
Historical population of Boulder County for period 1870-2014 [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
[1870-1880] +17.5 %/yr
[1880-1890] +3.77 %/yr
[1890-1900] +4.34 %/yr
[1900-1910] +3.48 %/yr
[1910-1920] +0.49 %/yr
[1920-1930] +0.19 %/yr
[1930-1940] +1.44 %/yr
[1940-1950] +2.58 %/yr
[1950-1960] +4.4 %/yr
[1960-1970] +5.91 %/yr
[1970-1980] +3.7 %/yr
[1980-1990] +1.74 %/yr
[1990-2000] +1.82 %/yr
[2000-2005] +0.76 %/yr
[2005-2010] +1 %/yr
[2010-2014] +0.12 %/yr
Looking for settlements in Boulder County? Visit this page: Settlements in Boulder County, CO
Population of Boulder County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8290 | 7532 | 15,822 |
| 5 to 9 | 9137 | 8814 | 17,951 |
| 10 to 14 | 9696 | 9133 | 18,829 |
| 15 to 19 | 12419 | 12266 | 24,685 |
| 20 to 24 | 17960 | 15948 | 33,908 |
| 25 to 29 | 11864 | 9792 | 21,656 |
| 30 to 34 | 10009 | 9554 | 19,563 |
| 35 to 39 | 9922 | 9765 | 19,687 |
| 40 to 44 | 10611 | 10403 | 21,014 |
| 45 to 49 | 10074 | 10413 | 20,487 |
| 50 to 54 | 10787 | 11120 | 21,907 |
| 55 to 59 | 10410 | 10828 | 21,238 |
| 60 to 64 | 8954 | 9364 | 18,318 |
| 65 to 69 | 6797 | 7192 | 13,989 |
| 70 to 74 | 4273 | 4787 | 9,060 |
| 75 to 79 | 2749 | 3273 | 6,022 |
| 80 to 84 | 1835 | 2418 | 4,253 |
| 85+ | 1606 | 3338 | 4,944 |
Boulder 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 | 146830 | 145451 | 292,281 |
| WA | 142988 | 141596 | 284,584 |
| NH | 135559 | 134485 | 270,044 |
| NHWAC | 126433 | 125249 | 251,682 |
| NHWA | 123276 | 122113 | 245,389 |
| H | 21834 | 21455 | 43,289 |
| HWAC | 20397 | 20202 | 40,599 |
| HWA | 19712 | 19483 | 39,195 |
| AAC | 8957 | 9432 | 18,389 |
| NHAAC | 8532 | 9027 | 17,559 |
| AA | 6847 | 7334 | 14,181 |
| NHAA | 6658 | 7178 | 13,836 |
| TOM | 4018 | 4061 | 8,079 |
| NHTOM | 3280 | 3292 | 6,572 |
| BAC | 2964 | 2504 | 5,468 |
| IAC | 2552 | 2576 | 5,128 |
| NHBAC | 2458 | 2028 | 4,486 |
| BA | 2018 | 1549 | 3,567 |
| NHBA | 1665 | 1217 | 2,882 |
| NHIAC | 1350 | 1475 | 2,825 |
| IA | 1365 | 1294 | 2,659 |
| HIAC | 1202 | 1101 | 2,303 |
| HTOM | 738 | 769 | 1,507 |
| HIA | 802 | 673 | 1,475 |
| NHIA | 563 | 621 | 1,184 |
| HBAC | 506 | 476 | 982 |
| HAAC | 425 | 405 | 830 |
| HBA | 353 | 332 | 685 |
| NAC | 358 | 314 | 672 |
| NHNAC | 275 | 232 | 507 |
| HAA | 189 | 156 | 345 |
| NA | 157 | 106 | 263 |
| NHNA | 117 | 64 | 181 |
| HNAC | 83 | 82 | 165 |
| HNA | 40 | 42 | 82 |
• Denver County population
35.8 mi, 
130°
• Jefferson County
36.5 mi, 
167°
• Adams County
58.4 mi, 
105°
• Larimer County
39.2 mi, 
353°
• Douglas County
58.8 mi, 
154°
• Broomfield County
20.7 mi, 
118°
• Summit County
51.1 mi, 
230°
• Grand County
36.9 mi, 
273°
• Clear Creek County
31.5 mi, 
207°
• Gilpin County
17.6 mi, 
203°
[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
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