Last official estimated population of Sonoma County was 484,666 (year 2014)[1]. This was 0.152% of total US population and 1.2% of total California state population. Area of Sonoma County is 1,767.9 mi² (=4579 km²), in this year population density was 274.14 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Sonoma County population in 2026 would be 487,038 [0].
Historical population of Sonoma 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] +35.71 %/yr
[1860-1870] +5.26 %/yr
[1870-1880] +2.72 %/yr
[1880-1890] +2.36 %/yr
[1890-1900] +1.63 %/yr
[1900-1910] +2.32 %/yr
[1910-1920] +0.74 %/yr
[1920-1930] +1.79 %/yr
[1930-1940] +1.05 %/yr
[1940-1950] +4.12 %/yr
[1950-1960] +3.61 %/yr
[1960-1970] +3.35 %/yr
[1970-1980] +3.88 %/yr
[1980-1990] +2.62 %/yr
[1990-2000] +1.68 %/yr
[2000-2005] +0.32 %/yr
[2005-2010] +0.76 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Sonoma County? Visit this page: Settlements in Sonoma County, CA
Population of Sonoma County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 13449 | 13051 | 26,500 |
| 5 to 9 | 14827 | 14245 | 29,072 |
| 10 to 14 | 15138 | 14297 | 29,435 |
| 15 to 19 | 15442 | 15311 | 30,753 |
| 20 to 24 | 16783 | 15417 | 32,200 |
| 25 to 29 | 16798 | 15547 | 32,345 |
| 30 to 34 | 16639 | 16271 | 32,910 |
| 35 to 39 | 15305 | 14766 | 30,071 |
| 40 to 44 | 15351 | 15274 | 30,625 |
| 45 to 49 | 16210 | 16268 | 32,478 |
| 50 to 54 | 17709 | 19284 | 36,993 |
| 55 to 59 | 17880 | 19568 | 37,448 |
| 60 to 64 | 16924 | 19089 | 36,013 |
| 65 to 69 | 14159 | 16070 | 30,229 |
| 70 to 74 | 9018 | 10337 | 19,355 |
| 75 to 79 | 5616 | 6984 | 12,600 |
| 80 to 84 | 3756 | 5348 | 9,104 |
| 85+ | 4120 | 8041 | 12,161 |
Sonoma 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 | 222916 | 231968 | 454,884 |
| WA | 214355 | 223004 | 437,359 |
| NH | 177654 | 192043 | 369,697 |
| NHWAC | 161506 | 174402 | 335,908 |
| NHWA | 155473 | 167865 | 323,338 |
| H | 67470 | 63125 | 130,595 |
| HWAC | 61410 | 57566 | 118,976 |
| HWA | 58882 | 55139 | 114,021 |
| AAC | 13684 | 15839 | 29,523 |
| NHAAC | 12139 | 14377 | 26,516 |
| AA | 9726 | 11729 | 21,455 |
| NHAA | 8970 | 11020 | 19,990 |
| TOM | 9228 | 9675 | 18,903 |
| IAC | 9255 | 9445 | 18,700 |
| BAC | 7778 | 6701 | 14,479 |
| NHTOM | 6517 | 7071 | 13,588 |
| NHBAC | 6003 | 5165 | 11,168 |
| IA | 5545 | 5489 | 11,034 |
| HIAC | 5416 | 5097 | 10,513 |
| BA | 5438 | 4236 | 9,674 |
| NHIAC | 3839 | 4348 | 8,187 |
| NHBA | 4258 | 3270 | 7,528 |
| HIA | 3765 | 3537 | 7,302 |
| HTOM | 2711 | 2604 | 5,315 |
| NAC | 1787 | 2045 | 3,832 |
| NHIA | 1780 | 1952 | 3,732 |
| HBAC | 1775 | 1536 | 3,311 |
| NHNAC | 1372 | 1642 | 3,014 |
| HAAC | 1545 | 1462 | 3,007 |
| HBA | 1180 | 966 | 2,146 |
| NA | 832 | 1035 | 1,867 |
| NHNA | 656 | 865 | 1,521 |
| HAA | 756 | 709 | 1,465 |
| HNAC | 415 | 403 | 818 |
| HNA | 176 | 170 | 346 |
• Contra Costa County population
67.4 mi,
128°
• San Francisco County
55.4 mi,
185°
• Solano County
56.3 mi,
108°
• Marin County
34.1 mi,
163°
• Yolo County
56.3 mi,
79°
• Napa County
32.5 mi,
92°
• Sutter County
74.7 mi,
61°
• Mendocino County
68.5 mi,
336°
• Lake County
40.5 mi,
13°
• Colusa County
58.4 mi,
39°
[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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