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Contra Costa County Historical Household and Family Data
ACS 2010-2014 data
Total population: 1,081,232
| Contra Costa County | California | U.S. | |
| Total Households | 380,183, 100% | 12,617,280 | 116,211,092 |
| Average Household Size | 2.82, see rank | 2.95 | 2.63 |
| 1 Person Households | 87,948, 23.13%, see rank | 24.10% | 27.57% |
| 2 or More Person Households | 292,235, 76.87%, see rank | 75.90% | 72.43% |
| Family Households (Families) | 269,678, 70.93%, see rank | 68.69% | 66.22% |
| Average Family Size | 3.43, see rank | 3.67 | 3.32 |
| Married-Couple Family | 204,860, 53.88%, see rank | 49.11% | 48.42% |
| Nonfamily Households | 110,505, 29.07%, see rank | 31.31% | 33.78% |
US Census 2010 data
Total population: 1,049,025
| Contra Costa County | California | U.S. | |
| Total Households | 375,364, 100% | 12,577,498 | 116,716,292 |
| Average Household Size | 2.77, see rank | 2.90 | 2.58 |
| 1 Person Households | 85,055, 22.66%, see rank | 23.29% | 26.74% |
| 2 or More Person Households | 290,309, 77.34%, see rank | 76.71% | 73.26% |
| Family Households (Families) | 265,280, 70.67%, see rank | 68.71% | 66.43% |
| Average Family Size | 3.26, see rank | 3.45 | 3.14 |
| Married-Couple Family | 199,021, 53.02%, see rank | 49.40% | 48.42% |
| Nonfamily Households | 110,084, 29.33%, see rank | 31.29% | 33.57% |
ACS 2008-2012 data
Total population: 1,052,047
| Contra Costa County | California | U.S. | |
| Total Households | 373,145, 100% | 12,466,331 | 115,226,802 |
| Average Household Size | 2.79, see rank | 2.93 | 2.61 |
| 1 Person Households | 89,647, 24.02%, see rank | 24.31% | 27.45% |
| 2 or More Person Households | 283,498, 75.98%, see rank | 75.69% | 72.55% |
| Family Households (Families) | 262,863, 70.45%, see rank | 68.59% | 66.47% |
| Average Family Size | 3.43, see rank | 3.65 | 3.29 |
| Married-Couple Family | 199,468, 53.46%, see rank | 49.35% | 48.97% |
| Nonfamily Households | 110,282, 29.55%, see rank | 31.41% | 33.53% |
ACS 2006-2010 data
Total population: 1,024,809
| Contra Costa County | California | U.S. | |
| Total Households | 368,087, 100% | 12,392,852 | 114,235,996 |
| Average Household Size | 2.75, see rank | 2.89 | 2.59 |
| 1 Person Households | 87,899, 23.88%, see rank | 24.39% | 27.24% |
| 2 or More Person Households | 280,188, 76.12%, see rank | 75.61% | 72.76% |
| Family Households (Families) | 259,502, 70.50%, see rank | 68.55% | 66.75% |
| Average Family Size | 3.38, see rank | 3.60 | 3.25 |
| Married-Couple Family | 197,800, 53.74%, see rank | 49.76% | 49.60% |
| Nonfamily Households | 108,585, 29.50%, see rank | 31.45% | 33.25% |
ACS 2005-2009 data
Total population: 1,015,571
| Contra Costa County | California | U.S. | |
| Total Households | 364,336, 100% | 12,187,191 | 112,611,029 |
| Average Household Size | 2.75, see rank | 2.91 | 2.60 |
| 1 Person Households | 87,268, 23.95%, see rank | 24.57% | 27.32% |
| 2 or More Person Households | 277,068, 76.05%, see rank | 75.43% | 72.68% |
| Family Households (Families) | 256,196, 70.32%, see rank | 68.38% | 66.67% |
| Average Family Size | 3.38, see rank | 3.63 | 3.27 |
| Married-Couple Family | 196,652, 53.98%, see rank | 49.93% | 49.71% |
| Nonfamily Households | 108,140, 29.68%, see rank | 31.62% | 33.33% |
US Census 2000 data
Total population: 948,816
| Contra Costa County | California | U.S. | |
| Total Households | 344,129, 100% | 11,502,870 | 105,480,101 |
| Average Household Size | 2.72, see rank | 2.87 | 2.59 |
| 1 Person Households | 78,759, 22.89%, see rank | 23.54% | 25.82% |
| 2 or More Person Households | 265,370, 77.11%, see rank | 76.46% | 74.18% |
| Family Households (Families) | 242,233, 70.39%, see rank | 68.85% | 68.06% |
| Average Family Size | 3.23, see rank | 3.43 | 3.14 |
| Married-Couple Family | 187,613, 54.52%, see rank | 51.09% | 51.66% |
| Nonfamily Households | 101,896, 29.61%, 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.