Last official estimated population of Larimer County was 300,484 (year 2014)[1]. This was 0.094% of total US population and 5.5% of total Colorado state population. Area of Larimer County is 2,634.0 mi² (=6822 km²), in this year population density was 114.08 p/mi². If population growth rate would be same as in period 2010-2014 (+0.07%/yr), Larimer County population in 2026 would be 303,061 [0].
Historical population of Larimer 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] +19.3 %/yr
[1880-1890] +7.1 %/yr
[1890-1900] +2.28 %/yr
[1900-1910] +7.58 %/yr
[1910-1920] +0.98 %/yr
[1920-1930] +1.75 %/yr
[1930-1940] +0.7 %/yr
[1940-1950] +2.05 %/yr
[1950-1960] +2.05 %/yr
[1960-1970] +5.36 %/yr
[1970-1980] +5.2 %/yr
[1980-1990] +2.24 %/yr
[1990-2000] +3.05 %/yr
[2000-2005] +1.81 %/yr
[2005-2010] +1.72 %/yr
[2010-2014] +0.07 %/yr
Looking for settlements in Larimer County? Visit this page: Settlements in Larimer County, CO
Population of Larimer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8966 | 8560 | 17,526 |
| 5 to 9 | 9643 | 9239 | 18,882 |
| 10 to 14 | 9720 | 9247 | 18,967 |
| 15 to 19 | 11332 | 11360 | 22,692 |
| 20 to 24 | 18552 | 17429 | 35,981 |
| 25 to 29 | 12345 | 11049 | 23,394 |
| 30 to 34 | 11226 | 10569 | 21,795 |
| 35 to 39 | 10284 | 9608 | 19,892 |
| 40 to 44 | 9915 | 9270 | 19,185 |
| 45 to 49 | 8806 | 9041 | 17,847 |
| 50 to 54 | 10020 | 10798 | 20,818 |
| 55 to 59 | 10538 | 11417 | 21,955 |
| 60 to 64 | 9639 | 10375 | 20,014 |
| 65 to 69 | 7815 | 8234 | 16,049 |
| 70 to 74 | 5275 | 5860 | 11,135 |
| 75 to 79 | 3272 | 3868 | 7,140 |
| 80 to 84 | 2245 | 2945 | 5,190 |
| 85+ | 1950 | 3710 | 5,660 |
Larimer 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 | 154169 | 155341 | 309,510 |
| WA | 150532 | 151621 | 302,153 |
| NH | 143126 | 144957 | 288,083 |
| NHWAC | 137184 | 139186 | 276,370 |
| NHWA | 134306 | 136239 | 270,545 |
| H | 18417 | 17622 | 36,039 |
| HWAC | 16985 | 16155 | 33,140 |
| HWA | 16226 | 15382 | 31,608 |
| AAC | 4936 | 5239 | 10,175 |
| NHAAC | 4556 | 4898 | 9,454 |
| TOM | 3819 | 3897 | 7,716 |
| AA | 3412 | 3727 | 7,139 |
| NHAA | 3235 | 3577 | 6,812 |
| IAC | 3113 | 3226 | 6,339 |
| NHTOM | 3010 | 3072 | 6,082 |
| BAC | 3007 | 2548 | 5,555 |
| NHBAC | 2549 | 2110 | 4,659 |
| BA | 1993 | 1496 | 3,489 |
| NHIAC | 1735 | 1749 | 3,484 |
| IA | 1614 | 1669 | 3,283 |
| NHBA | 1711 | 1239 | 2,950 |
| HIAC | 1378 | 1477 | 2,855 |
| HIA | 874 | 956 | 1,830 |
| HTOM | 809 | 825 | 1,634 |
| NHIA | 740 | 713 | 1,453 |
| HBAC | 458 | 438 | 896 |
| NAC | 397 | 399 | 796 |
| HAAC | 380 | 341 | 721 |
| NHNAC | 304 | 300 | 604 |
| HBA | 282 | 257 | 539 |
| NA | 173 | 169 | 342 |
| HAA | 177 | 150 | 327 |
| NHNA | 124 | 117 | 241 |
| HNAC | 93 | 99 | 192 |
| HNA | 49 | 52 | 101 |
• Denver County population
69.7 mi,
152°
• Boulder County
39.2 mi,
173°
• Weld County
57.8 mi,
97°
• Laramie County
61.5 mi,
44°
• Broomfield County
53.8 mi,
154°
• Albany County
70.7 mi,
350°
• Grand County
48.9 mi,
220°
• Clear Creek County
67.6 mi,
188°
• Gilpin County
55.1 mi,
182°
• Jackson County
44.2 mi,
270°
[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
See note 3 Colorado Notes
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