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Williamson County Historical Household and Family Data
ACS 2010-2014 data
Total population: 66,808
| Williamson County | Illinois | U.S. | |
| Total Households | 26,758, 100% | 4,778,633 | 116,211,092 |
| Average Household Size | 2.42, see rank | 2.63 | 2.63 |
| 1 Person Households | 7,487, 27.98%, see rank | 28.68% | 27.57% |
| 2 or More Person Households | 19,271, 72.02%, see rank | 71.32% | 72.43% |
| Family Households (Families) | 18,080, 67.57%, see rank | 65.52% | 66.22% |
| Average Family Size | 3.01, see rank | 3.36 | 3.32 |
| Married-Couple Family | 13,864, 51.81%, see rank | 48.22% | 48.42% |
| Nonfamily Households | 8,678, 32.43%, see rank | 34.48% | 33.78% |
US Census 2010 data
Total population: 66,357
| Williamson County | Illinois | U.S. | |
| Total Households | 27,421, 100% | 4,836,972 | 116,716,292 |
| Average Household Size | 2.35, see rank | 2.59 | 2.58 |
| 1 Person Households | 7,974, 29.08%, see rank | 27.83% | 26.74% |
| 2 or More Person Households | 19,447, 70.92%, see rank | 72.17% | 73.26% |
| Family Households (Families) | 17,999, 65.64%, see rank | 65.81% | 66.43% |
| Average Family Size | 2.88, see rank | 3.20 | 3.14 |
| Married-Couple Family | 13,545, 49.40%, see rank | 48.23% | 48.42% |
| Nonfamily Households | 9,422, 34.36%, see rank | 34.19% | 33.57% |
ACS 2008-2012 data
Total population: 66,335
| Williamson County | Illinois | U.S. | |
| Total Households | 26,813, 100% | 4,774,275 | 115,226,802 |
| Average Household Size | 2.40, see rank | 2.62 | 2.61 |
| 1 Person Households | 7,903, 29.47%, see rank | 28.52% | 27.45% |
| 2 or More Person Households | 18,910, 70.53%, see rank | 71.48% | 72.55% |
| Family Households (Families) | 17,644, 65.80%, see rank | 65.82% | 66.47% |
| Average Family Size | 3.03, see rank | 3.34 | 3.29 |
| Married-Couple Family | 13,265, 49.47%, see rank | 48.67% | 48.97% |
| Nonfamily Households | 9,169, 34.20%, see rank | 34.18% | 33.53% |
ACS 2006-2010 data
Total population: 65,579
| Williamson County | Illinois | U.S. | |
| Total Households | 26,324, 100% | 4,769,951 | 114,235,996 |
| Average Household Size | 2.43, see rank | 2.61 | 2.59 |
| 1 Person Households | 7,708, 29.28%, see rank | 28.23% | 27.24% |
| 2 or More Person Households | 18,616, 70.72%, see rank | 71.77% | 72.76% |
| Family Households (Families) | 17,392, 66.07%, see rank | 66.28% | 66.75% |
| Average Family Size | 3.07, see rank | 3.31 | 3.25 |
| Married-Couple Family | 13,569, 51.55%, see rank | 49.36% | 49.60% |
| Nonfamily Households | 8,932, 33.93%, see rank | 33.72% | 33.25% |
ACS 2005-2009 data
Total population: 64,212
| Williamson County | Illinois | U.S. | |
| Total Households | 26,269, 100% | 4,749,388 | 112,611,029 |
| Average Household Size | 2.38, see rank | 2.62 | 2.60 |
| 1 Person Households | 7,641, 29.09%, see rank | 28.40% | 27.32% |
| 2 or More Person Households | 18,628, 70.91%, see rank | 71.60% | 72.68% |
| Family Households (Families) | 17,448, 66.42%, see rank | 66.09% | 66.67% |
| Average Family Size | 2.99, see rank | 3.34 | 3.27 |
| Married-Couple Family | 13,255, 50.46%, see rank | 49.35% | 49.71% |
| Nonfamily Households | 8,821, 33.58%, see rank | 33.91% | 33.33% |
US Census 2000 data
Total population: 61,296
| Williamson County | Illinois | U.S. | |
| Total Households | 25,358, 100% | 4,591,779 | 105,480,101 |
| Average Household Size | 2.35, see rank | 2.63 | 2.59 |
| 1 Person Households | 7,324, 28.88%, see rank | 26.78% | 25.82% |
| 2 or More Person Households | 18,034, 71.12%, see rank | 73.22% | 74.18% |
| Family Households (Families) | 16,969, 66.92%, see rank | 67.63% | 68.06% |
| Average Family Size | 2.89, see rank | 3.23 | 3.14 |
| Married-Couple Family | 13,531, 53.36%, see rank | 51.26% | 51.66% |
| Nonfamily Households | 8,389, 33.08%, see rank | 32.37% | 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.