Nassau County Historical Household and Family Data
ACS 2010-2014 data
Total population: 1,350,601
| Nassau County | New York | U.S. | |
| Total Households | 441,912, 100% | 7,255,528 | 116,211,092 |
| Average Household Size | 3.01, see rank | 2.62 | 2.63 |
| 1 Person Households | 87,558, 19.81%, see rank | 29.55% | 27.57% |
| 2 or More Person Households | 354,354, 80.19%, see rank | 70.45% | 72.43% |
| Family Households (Families) | 338,607, 76.62%, see rank | 63.90% | 66.22% |
| Average Family Size | 3.55, see rank | 3.38 | 3.32 |
| Married-Couple Family | 267,172, 60.46%, see rank | 44.12% | 48.42% |
| Nonfamily Households | 103,305, 23.38%, see rank | 36.10% | 33.78% |
US Census 2010 data
Total population: 1,339,532
| Nassau County | New York | U.S. | |
| Total Households | 448,528, 100% | 7,317,755 | 116,716,292 |
| Average Household Size | 2.94, see rank | 2.57 | 2.58 |
| 1 Person Households | 90,292, 20.13%, see rank | 29.12% | 26.74% |
| 2 or More Person Households | 358,236, 79.87%, see rank | 70.88% | 73.26% |
| Family Households (Families) | 340,523, 75.92%, see rank | 63.54% | 66.43% |
| Average Family Size | 3.38, see rank | 3.20 | 3.14 |
| Married-Couple Family | 269,043, 59.98%, see rank | 43.63% | 48.42% |
| Nonfamily Households | 108,005, 24.08%, see rank | 36.46% | 33.57% |
ACS 2008-2012 data
Total population: 1,338,712
| Nassau County | New York | U.S. | |
| Total Households | 442,869, 100% | 7,230,896 | 115,226,802 |
| Average Household Size | 2.97, see rank | 2.60 | 2.61 |
| 1 Person Households | 87,761, 19.82%, see rank | 29.31% | 27.45% |
| 2 or More Person Households | 355,108, 80.18%, see rank | 70.69% | 72.55% |
| Family Households (Families) | 340,577, 76.90%, see rank | 64.26% | 66.47% |
| Average Family Size | 3.50, see rank | 3.35 | 3.29 |
| Married-Couple Family | 271,101, 61.21%, see rank | 44.60% | 48.97% |
| Nonfamily Households | 102,292, 23.10%, see rank | 35.74% | 33.53% |
ACS 2006-2010 data
Total population: 1,329,083
| Nassau County | New York | U.S. | |
| Total Households | 442,833, 100% | 7,205,740 | 114,235,996 |
| Average Household Size | 2.95, see rank | 2.59 | 2.59 |
| 1 Person Households | 88,204, 19.92%, see rank | 29.08% | 27.24% |
| 2 or More Person Households | 354,629, 80.08%, see rank | 70.92% | 72.76% |
| Family Households (Families) | 340,122, 76.81%, see rank | 64.62% | 66.75% |
| Average Family Size | 3.48, see rank | 3.31 | 3.25 |
| Married-Couple Family | 273,493, 61.76%, see rank | 45.20% | 49.60% |
| Nonfamily Households | 102,711, 23.19%, see rank | 35.38% | 33.25% |
ACS 2005-2009 data
Total population: 1,354,141
| Nassau County | New York | U.S. | |
| Total Households | 435,764, 100% | 7,137,013 | 112,611,029 |
| Average Household Size | 3.05, see rank | 2.64 | 2.60 |
| 1 Person Households | 87,602, 20.10%, see rank | 29.48% | 27.32% |
| 2 or More Person Households | 348,162, 79.90%, see rank | 70.52% | 72.68% |
| Family Households (Families) | 334,876, 76.85%, see rank | 64.46% | 66.67% |
| Average Family Size | 3.61, see rank | 3.40 | 3.27 |
| Married-Couple Family | 271,146, 62.22%, see rank | 45.27% | 49.71% |
| Nonfamily Households | 100,888, 23.15%, see rank | 35.54% | 33.33% |
US Census 2000 data
Total population: 1,334,544
| Nassau County | New York | U.S. | |
| Total Households | 447,387, 100% | 7,056,860 | 105,480,101 |
| Average Household Size | 2.93, see rank | 2.61 | 2.59 |
| 1 Person Households | 84,280, 18.84%, see rank | 28.10% | 25.82% |
| 2 or More Person Households | 363,107, 81.16%, see rank | 71.90% | 74.18% |
| Family Households (Families) | 347,026, 77.57%, see rank | 65.74% | 68.06% |
| Average Family Size | 3.34, see rank | 3.22 | 3.14 |
| Married-Couple Family | 282,126, 63.06%, see rank | 46.61% | 51.66% |
| Nonfamily Households | 100,361, 22.43%, see rank | 34.26% | 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.