Last official estimated population of Mendocino County was 87,761 (year 2014)[1]. This was 0.028% of total US population and 0.2% of total California state population. Area of Mendocino County is 3,878.2 mi² (=10044.4 km²), in this year population density was 22.63 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Mendocino County population in 2026 would be 87,521 [0].
Historical population of Mendocino County for period 1850-2014 [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

[1850-1860] +53.39 %/yr
[1860-1870] +6.64 %/yr
[1870-1880] +5.43 %/yr
[1880-1890] +3.24 %/yr
[1890-1900] +1.51 %/yr
[1900-1910] +1.58 %/yr
[1910-1920] +0.08 %/yr
[1920-1930] -0.26 %/yr
[1930-1940] +1.72 %/yr
[1940-1950] +3.9 %/yr
[1950-1960] +2.25 %/yr
[1960-1970] +0.01 %/yr
[1970-1980] +2.71 %/yr
[1980-1990] +1.87 %/yr
[1990-2000] +0.71 %/yr
[2000-2005] +0.4 %/yr
[2005-2010] -0.03 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Mendocino County? Visit this page: Settlements in Mendocino County, CA
Population of Mendocino County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2760 | 2670 | 5,430 |
| 5 to 9 | 2767 | 2587 | 5,354 |
| 10 to 14 | 2639 | 2569 | 5,208 |
| 15 to 19 | 2684 | 2497 | 5,181 |
| 20 to 24 | 2585 | 2298 | 4,883 |
| 25 to 29 | 2596 | 2381 | 4,977 |
| 30 to 34 | 2757 | 2588 | 5,345 |
| 35 to 39 | 2618 | 2524 | 5,142 |
| 40 to 44 | 2587 | 2494 | 5,081 |
| 45 to 49 | 2575 | 2468 | 5,043 |
| 50 to 54 | 2821 | 3038 | 5,859 |
| 55 to 59 | 3207 | 3380 | 6,587 |
| 60 to 64 | 3381 | 3770 | 7,151 |
| 65 to 69 | 3219 | 3227 | 6,446 |
| 70 to 74 | 1945 | 2009 | 3,954 |
| 75 to 79 | 1145 | 1261 | 2,406 |
| 80 to 84 | 735 | 952 | 1,687 |
| 85+ | 705 | 1430 | 2,135 |
Mendocino 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 | 39391 | 39624 | 79,015 |
| WA | 37816 | 38009 | 75,825 |
| NH | 32620 | 34075 | 66,695 |
| NHWAC | 29726 | 30778 | 60,504 |
| NHWA | 28594 | 29603 | 58,197 |
| H | 11106 | 10068 | 21,174 |
| HWAC | 9665 | 8846 | 18,511 |
| HWA | 9222 | 8406 | 17,628 |
| IAC | 3784 | 3813 | 7,597 |
| IA | 2773 | 2762 | 5,535 |
| NHIAC | 2314 | 2530 | 4,844 |
| NHIA | 1658 | 1822 | 3,480 |
| TOM | 1720 | 1754 | 3,474 |
| HIAC | 1470 | 1283 | 2,753 |
| AAC | 1147 | 1553 | 2,700 |
| NHTOM | 1242 | 1283 | 2,525 |
| NHAAC | 1011 | 1410 | 2,421 |
| HIA | 1115 | 940 | 2,055 |
| AA | 745 | 1170 | 1,915 |
| NHAA | 669 | 1084 | 1,753 |
| BAC | 946 | 719 | 1,665 |
| NHBAC | 692 | 534 | 1,226 |
| HTOM | 478 | 471 | 949 |
| BA | 560 | 337 | 897 |
| NHBA | 391 | 227 | 618 |
| NAC | 225 | 231 | 456 |
| HBAC | 254 | 185 | 439 |
| NHNAC | 158 | 147 | 305 |
| HBA | 169 | 110 | 279 |
| HAAC | 136 | 143 | 279 |
| NA | 112 | 111 | 223 |
| HAA | 76 | 86 | 162 |
| HNAC | 67 | 84 | 151 |
| NHNA | 66 | 56 | 122 |
| HNA | 46 | 55 | 101 |
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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
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