Last official estimated population of Los Alamos County was 18,012 (year 2014)[1]. This was 0.006% of total US population and 0.9% of total New Mexico state population. Area of Los Alamos County is 109.3 mi² (=283 km²), in this year population density was 164.86 p/mi². If population growth rate would be same as in period 2010-2014 (+0.09%/yr), Los Alamos County population in 2021 would be 18,121 [0].
Historical population of Los Alamos 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] -100 %/yr
[1900-1910] -100 %/yr
[1910-1920] -100 %/yr
[1920-1930] -100 %/yr
[1930-1940] -100 %/yr
[1940-1950] -100 %/yr
[1950-1960] +2.21 %/yr
[1960-1970] +1.55 %/yr
[1970-1980] +1.48 %/yr
[1980-1990] +0.29 %/yr
[1990-2000] +0.13 %/yr
[2000-2005] +0.07 %/yr
[2005-2010] -0.5 %/yr
[2010-2014] +0.09 %/yr
Looking for settlements in Los Alamos County? Visit this page: Settlements in Los Alamos County, NM
Population of Los Alamos County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 505 | 472 | 977 |
| 5 to 9 | 583 | 537 | 1,120 |
| 10 to 14 | 630 | 600 | 1,230 |
| 15 to 19 | 609 | 604 | 1,213 |
| 20 to 24 | 409 | 345 | 754 |
| 25 to 29 | 386 | 315 | 701 |
| 30 to 34 | 559 | 470 | 1,029 |
| 35 to 39 | 550 | 499 | 1,049 |
| 40 to 44 | 544 | 566 | 1,110 |
| 45 to 49 | 603 | 642 | 1,245 |
| 50 to 54 | 775 | 770 | 1,545 |
| 55 to 59 | 773 | 711 | 1,484 |
| 60 to 64 | 638 | 647 | 1,285 |
| 65 to 69 | 487 | 459 | 946 |
| 70 to 74 | 352 | 366 | 718 |
| 75 to 79 | 238 | 243 | 481 |
| 80 to 84 | 164 | 192 | 356 |
| 85+ | 178 | 261 | 439 |
Los Alamos 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 | 8153 | 7990 | 16,143 |
| WA | 7964 | 7772 | 15,736 |
| NH | 7600 | 7137 | 14,737 |
| NHWAC | 6835 | 6494 | 13,329 |
| NHWA | 6686 | 6322 | 13,008 |
| H | 1383 | 1562 | 2,945 |
| HWAC | 1318 | 1496 | 2,814 |
| HWA | 1278 | 1450 | 2,728 |
| AAC | 695 | 609 | 1,304 |
| NHAAC | 673 | 594 | 1,267 |
| AA | 614 | 524 | 1,138 |
| NHAA | 604 | 520 | 1,124 |
| TOM | 210 | 227 | 437 |
| IAC | 199 | 203 | 402 |
| NHTOM | 165 | 180 | 345 |
| NHIAC | 135 | 131 | 266 |
| BAC | 124 | 109 | 233 |
| IA | 113 | 111 | 224 |
| NHBAC | 105 | 85 | 190 |
| NHIA | 73 | 63 | 136 |
| HIAC | 64 | 72 | 136 |
| BA | 75 | 56 | 131 |
| NHBA | 68 | 46 | 114 |
| HTOM | 45 | 47 | 92 |
| HIA | 40 | 48 | 88 |
| NAC | 24 | 22 | 46 |
| HBAC | 19 | 24 | 43 |
| HAAC | 22 | 15 | 37 |
| NHNAC | 18 | 16 | 34 |
| HBA | 7 | 10 | 17 |
| NA | 7 | 9 | 16 |
| HAA | 10 | 4 | 14 |
| HNAC | 6 | 6 | 12 |
| NHNA | 4 | 6 | 10 |
| HNA | 3 | 3 | 6 |
• Bernalillo County population
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[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
*Sandoval, Santa Fe New Mexico Notes
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