Last official estimated population of San Mateo County was 719,951 (year 2014)[1]. This was 0.226% of total US population and 1.8% of total California state population. Area of San Mateo County is 741.0 mi² (=1919.1 km²), in this year population density was 971.65 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), San Mateo County population in 2024 would be 723,715 [0].
Historical population of San Mateo County for period 1860-2014 [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
[1860-1870] +7.52 %/yr
[1870-1880] +2.71 %/yr
[1880-1890] +1.53 %/yr
[1890-1900] +1.83 %/yr
[1900-1910] +8.19 %/yr
[1910-1920] +3.3 %/yr
[1920-1930] +7.72 %/yr
[1930-1940] +3.74 %/yr
[1940-1950] +7.74 %/yr
[1950-1960] +6.55 %/yr
[1960-1970] +2.27 %/yr
[1970-1980] +0.55 %/yr
[1980-1990] +1.01 %/yr
[1990-2000] +0.85 %/yr
[2000-2005] -0.49 %/yr
[2005-2010] +0.81 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in San Mateo County? Visit this page: Settlements in San Mateo County, CA
Population of San Mateo County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 23540 | 22653 | 46,193 |
| 5 to 9 | 23680 | 22642 | 46,322 |
| 10 to 14 | 22816 | 21712 | 44,528 |
| 15 to 19 | 20838 | 19923 | 40,761 |
| 20 to 24 | 22054 | 20482 | 42,536 |
| 25 to 29 | 26462 | 24226 | 50,688 |
| 30 to 34 | 28719 | 27700 | 56,419 |
| 35 to 39 | 27404 | 27482 | 54,886 |
| 40 to 44 | 27993 | 27947 | 55,940 |
| 45 to 49 | 26924 | 27827 | 54,751 |
| 50 to 54 | 27645 | 28827 | 56,472 |
| 55 to 59 | 25596 | 27116 | 52,712 |
| 60 to 64 | 21642 | 23525 | 45,167 |
| 65 to 69 | 16884 | 19542 | 36,426 |
| 70 to 74 | 11279 | 14060 | 25,339 |
| 75 to 79 | 8067 | 10341 | 18,408 |
| 80 to 84 | 5936 | 8092 | 14,028 |
| 85+ | 5952 | 11053 | 17,005 |
San Mateo 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 |
| NH | 276828 | 290150 | 566,978 |
| WAC | 252015 | 251387 | 503,402 |
| WA | 237507 | 236745 | 474,252 |
| NHWAC | 164276 | 164863 | 329,139 |
| NHWA | 153180 | 153652 | 306,832 |
| AAC | 110157 | 123294 | 233,451 |
| NHAAC | 105022 | 118186 | 223,208 |
| AA | 98335 | 111413 | 209,748 |
| NHAA | 95369 | 108497 | 203,866 |
| H | 96603 | 95000 | 191,603 |
| HWAC | 87739 | 86524 | 174,263 |
| HWA | 84327 | 83093 | 167,420 |
| TOM | 16733 | 16940 | 33,673 |
| BAC | 15003 | 14435 | 29,438 |
| NHTOM | 12889 | 13057 | 25,946 |
| NHBAC | 12234 | 11623 | 23,857 |
| BA | 11637 | 10920 | 22,557 |
| NHBA | 9678 | 8963 | 18,641 |
| NAC | 8316 | 8656 | 16,972 |
| NHNAC | 7094 | 7427 | 14,521 |
| IAC | 6319 | 6160 | 12,479 |
| NA | 5827 | 6047 | 11,874 |
| NHNA | 5158 | 5388 | 10,546 |
| HAAC | 5135 | 5108 | 10,243 |
| HIAC | 4170 | 3833 | 8,003 |
| HTOM | 3844 | 3883 | 7,727 |
| IA | 3392 | 3085 | 6,477 |
| HAA | 2966 | 2916 | 5,882 |
| HBAC | 2769 | 2812 | 5,581 |
| HIA | 2838 | 2492 | 5,330 |
| NHIAC | 2149 | 2327 | 4,476 |
| HBA | 1959 | 1957 | 3,916 |
| HNAC | 1222 | 1229 | 2,451 |
| HNA | 669 | 659 | 1,328 |
| NHIA | 554 | 593 | 1,147 |
• Santa Clara County population
39.7 mi, 
109°
• Alameda County
29.9 mi, 
57°
• Contra Costa County
41.8 mi, 
33°
• San Francisco County
42.1 mi, 
300°
• San Joaquin County
70 mi, 59°
• Stanislaus County
75.7 mi, 
82°
• Solano County
63.4 mi, 
21°
• Santa Cruz County
34.3 mi, 
144°
• Marin County
48.5 mi, 
335°
• Napa County
75.5 mi, 
1°
[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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