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Snohomish County Historical Household and Family Data
ACS 2010-2014 data
Total population: 735,351
| Snohomish County | Washington | U.S. | |
| Total Households | 271,514, 100% | 2,645,396 | 116,211,092 |
| Average Household Size | 2.67, see rank | 2.55 | 2.63 |
| 1 Person Households | 67,762, 24.96%, see rank | 27.79% | 27.57% |
| 2 or More Person Households | 203,752, 75.04%, see rank | 72.21% | 72.43% |
| Family Households (Families) | 184,712, 68.03%, see rank | 64.48% | 66.22% |
| Average Family Size | 3.31, see rank | 3.23 | 3.32 |
| Married-Couple Family | 143,474, 52.84%, see rank | 49.73% | 48.42% |
| Nonfamily Households | 86,802, 31.97%, see rank | 35.52% | 33.78% |
US Census 2010 data
Total population: 713,335
| Snohomish County | Washington | U.S. | |
| Total Households | 268,325, 100% | 2,620,076 | 116,716,292 |
| Average Household Size | 2.62, see rank | 2.51 | 2.58 |
| 1 Person Households | 65,319, 24.34%, see rank | 27.16% | 26.74% |
| 2 or More Person Households | 203,006, 75.66%, see rank | 72.84% | 73.26% |
| Family Households (Families) | 182,282, 67.93%, see rank | 64.40% | 66.43% |
| Average Family Size | 3.12, see rank | 3.06 | 3.14 |
| Married-Couple Family | 140,500, 52.36%, see rank | 49.19% | 48.42% |
| Nonfamily Households | 86,043, 32.07%, see rank | 35.60% | 33.57% |
ACS 2008-2012 data
Total population: 714,443
| Snohomish County | Washington | U.S. | |
| Total Households | 268,546, 100% | 2,619,995 | 115,226,802 |
| Average Household Size | 2.62, see rank | 2.52 | 2.61 |
| 1 Person Households | 66,370, 24.71%, see rank | 27.74% | 27.45% |
| 2 or More Person Households | 202,176, 75.29%, see rank | 72.26% | 72.55% |
| Family Households (Families) | 183,376, 68.28%, see rank | 64.49% | 66.47% |
| Average Family Size | 3.23, see rank | 3.18 | 3.29 |
| Married-Couple Family | 142,656, 53.12%, see rank | 49.98% | 48.97% |
| Nonfamily Households | 85,170, 31.72%, see rank | 35.51% | 33.53% |
ACS 2006-2010 data
Total population: 694,219
| Snohomish County | Washington | U.S. | |
| Total Households | 263,931, 100% | 2,577,375 | 114,235,996 |
| Average Household Size | 2.60, see rank | 2.49 | 2.59 |
| 1 Person Households | 65,975, 25.00%, see rank | 27.74% | 27.24% |
| 2 or More Person Households | 197,956, 75.00%, see rank | 72.26% | 72.76% |
| Family Households (Families) | 180,063, 68.22%, see rank | 64.62% | 66.75% |
| Average Family Size | 3.21, see rank | 3.14 | 3.25 |
| Married-Couple Family | 140,435, 53.21%, see rank | 50.17% | 49.60% |
| Nonfamily Households | 83,868, 31.78%, see rank | 35.38% | 33.25% |
ACS 2005-2009 data
Total population: 673,709
| Snohomish County | Washington | U.S. | |
| Total Households | 259,142, 100% | 2,512,327 | 112,611,029 |
| Average Household Size | 2.56, see rank | 2.52 | 2.60 |
| 1 Person Households | 64,243, 24.79%, see rank | 27.81% | 27.32% |
| 2 or More Person Households | 194,899, 75.21%, see rank | 72.19% | 72.68% |
| Family Households (Families) | 176,262, 68.02%, see rank | 64.50% | 66.67% |
| Average Family Size | 3.17, see rank | 3.18 | 3.27 |
| Married-Couple Family | 137,674, 53.13%, see rank | 50.27% | 49.71% |
| Nonfamily Households | 82,880, 31.98%, see rank | 35.50% | 33.33% |
US Census 2000 data
Total population: 606,024
| Snohomish County | Washington | U.S. | |
| Total Households | 224,852, 100% | 2,271,398 | 105,480,101 |
| Average Household Size | 2.65, see rank | 2.53 | 2.59 |
| 1 Person Households | 50,820, 22.60%, see rank | 26.17% | 25.82% |
| 2 or More Person Households | 174,032, 77.40%, see rank | 73.83% | 74.18% |
| Family Households (Families) | 157,820, 70.19%, see rank | 66.00% | 68.06% |
| Average Family Size | 3.13, see rank | 3.07 | 3.14 |
| Married-Couple Family | 125,957, 56.02%, see rank | 52.04% | 51.66% |
| Nonfamily Households | 67,032, 29.81%, see rank | 34.00% | 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.