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San Mateo County Historical Household and Family Data
ACS 2010-2014 data
Total population: 739,837
| San Mateo County | California | U.S. | |
| Total Households | 258,683, 100% | 12,617,280 | 116,211,092 |
| Average Household Size | 2.82, see rank | 2.95 | 2.63 |
| 1 Person Households | 65,162, 25.19%, see rank | 24.10% | 27.57% |
| 2 or More Person Households | 193,521, 74.81%, see rank | 75.90% | 72.43% |
| Family Households (Families) | 175,308, 67.77%, see rank | 68.69% | 66.22% |
| Average Family Size | 3.53, see rank | 3.67 | 3.32 |
| Married-Couple Family | 136,793, 52.88%, see rank | 49.11% | 48.42% |
| Nonfamily Households | 83,375, 32.23%, see rank | 31.31% | 33.78% |
US Census 2010 data
Total population: 718,451
| San Mateo County | California | U.S. | |
| Total Households | 257,837, 100% | 12,577,498 | 116,716,292 |
| Average Household Size | 2.75, see rank | 2.90 | 2.58 |
| 1 Person Households | 63,219, 24.52%, see rank | 23.29% | 26.74% |
| 2 or More Person Households | 194,618, 75.48%, see rank | 76.71% | 73.26% |
| Family Households (Families) | 175,607, 68.11%, see rank | 68.71% | 66.43% |
| Average Family Size | 3.28, see rank | 3.45 | 3.14 |
| Married-Couple Family | 135,210, 52.44%, see rank | 49.40% | 48.42% |
| Nonfamily Households | 82,230, 31.89%, see rank | 31.29% | 33.57% |
ACS 2008-2012 data
Total population: 721,183
| San Mateo County | California | U.S. | |
| Total Households | 257,369, 100% | 12,466,331 | 115,226,802 |
| Average Household Size | 2.76, see rank | 2.93 | 2.61 |
| 1 Person Households | 65,999, 25.64%, see rank | 24.31% | 27.45% |
| 2 or More Person Households | 191,370, 74.36%, see rank | 75.69% | 72.55% |
| Family Households (Families) | 173,782, 67.52%, see rank | 68.59% | 66.47% |
| Average Family Size | 3.46, see rank | 3.65 | 3.29 |
| Married-Couple Family | 135,302, 52.57%, see rank | 49.35% | 48.97% |
| Nonfamily Households | 83,587, 32.48%, see rank | 31.41% | 33.53% |
ACS 2006-2010 data
Total population: 704,327
| San Mateo County | California | U.S. | |
| Total Households | 255,758, 100% | 12,392,852 | 114,235,996 |
| Average Household Size | 2.72, see rank | 2.89 | 2.59 |
| 1 Person Households | 65,523, 25.62%, see rank | 24.39% | 27.24% |
| 2 or More Person Households | 190,235, 74.38%, see rank | 75.61% | 72.76% |
| Family Households (Families) | 172,517, 67.45%, see rank | 68.55% | 66.75% |
| Average Family Size | 3.40, see rank | 3.60 | 3.25 |
| Married-Couple Family | 134,732, 52.68%, see rank | 49.76% | 49.60% |
| Nonfamily Households | 83,241, 32.55%, see rank | 31.45% | 33.25% |
ACS 2005-2009 data
Total population: 701,886
| San Mateo County | California | U.S. | |
| Total Households | 252,860, 100% | 12,187,191 | 112,611,029 |
| Average Household Size | 2.74, see rank | 2.91 | 2.60 |
| 1 Person Households | 64,302, 25.43%, see rank | 24.57% | 27.32% |
| 2 or More Person Households | 188,558, 74.57%, see rank | 75.43% | 72.68% |
| Family Households (Families) | 171,068, 67.65%, see rank | 68.38% | 66.67% |
| Average Family Size | 3.42, see rank | 3.63 | 3.27 |
| Married-Couple Family | 134,412, 53.16%, see rank | 49.93% | 49.71% |
| Nonfamily Households | 81,792, 32.35%, see rank | 31.62% | 33.33% |
US Census 2000 data
Total population: 707,161
| San Mateo County | California | U.S. | |
| Total Households | 254,103, 100% | 11,502,870 | 105,480,101 |
| Average Household Size | 2.74, see rank | 2.87 | 2.59 |
| 1 Person Households | 62,626, 24.65%, see rank | 23.54% | 25.82% |
| 2 or More Person Households | 191,477, 75.35%, see rank | 76.46% | 74.18% |
| Family Households (Families) | 171,249, 67.39%, see rank | 68.85% | 68.06% |
| Average Family Size | 3.29, see rank | 3.43 | 3.14 |
| Married-Couple Family | 134,739, 53.03%, see rank | 51.09% | 51.66% |
| Nonfamily Households | 82,854, 32.61%, see rank | 31.15% | 31.94% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.