Cook County Historical Household and Family Data
ACS 2010-2014 data
Total population: 5,227,827
| Cook County | Illinois | U.S. | |
| Total Households | 1,937,060, 100% | 4,778,633 | 116,211,092 |
| Average Household Size | 2.65, see rank | 2.63 | 2.63 |
| 1 Person Households | 622,518, 32.14%, see rank | 28.68% | 27.57% |
| 2 or More Person Households | 1,314,542, 67.86%, see rank | 71.32% | 72.43% |
| Family Households (Families) | 1,185,299, 61.19%, see rank | 65.52% | 66.22% |
| Average Family Size | 3.54, see rank | 3.36 | 3.32 |
| Married-Couple Family | 794,583, 41.02%, see rank | 48.22% | 48.42% |
| Nonfamily Households | 751,761, 38.81%, see rank | 34.48% | 33.78% |
US Census 2010 data
Total population: 5,194,675
| Cook County | Illinois | U.S. | |
| Total Households | 1,966,356, 100% | 4,836,972 | 116,716,292 |
| Average Household Size | 2.60, see rank | 2.59 | 2.58 |
| 1 Person Households | 609,582, 31.00%, see rank | 27.83% | 26.74% |
| 2 or More Person Households | 1,356,774, 69.00%, see rank | 72.17% | 73.26% |
| Family Households (Families) | 1,211,420, 61.61%, see rank | 65.81% | 66.43% |
| Average Family Size | 3.34, see rank | 3.20 | 3.14 |
| Married-Couple Family | 803,942, 40.88%, see rank | 48.23% | 48.42% |
| Nonfamily Households | 754,936, 38.39%, see rank | 34.19% | 33.57% |
ACS 2008-2012 data
Total population: 5,197,677
| Cook County | Illinois | U.S. | |
| Total Households | 1,933,670, 100% | 4,774,275 | 115,226,802 |
| Average Household Size | 2.64, see rank | 2.62 | 2.61 |
| 1 Person Households | 619,659, 32.05%, see rank | 28.52% | 27.45% |
| 2 or More Person Households | 1,314,011, 67.95%, see rank | 71.48% | 72.55% |
| Family Households (Families) | 1,189,321, 61.51%, see rank | 65.82% | 66.47% |
| Average Family Size | 3.52, see rank | 3.34 | 3.29 |
| Married-Couple Family | 799,030, 41.32%, see rank | 48.67% | 48.97% |
| Nonfamily Households | 744,349, 38.49%, see rank | 34.18% | 33.53% |
ACS 2006-2010 data
Total population: 5,172,848
| Cook County | Illinois | U.S. | |
| Total Households | 1,936,481, 100% | 4,769,951 | 114,235,996 |
| Average Household Size | 2.63, see rank | 2.61 | 2.59 |
| 1 Person Households | 613,552, 31.68%, see rank | 28.23% | 27.24% |
| 2 or More Person Households | 1,322,929, 68.32%, see rank | 71.77% | 72.76% |
| Family Households (Families) | 1,203,421, 62.14%, see rank | 66.28% | 66.75% |
| Average Family Size | 3.48, see rank | 3.31 | 3.25 |
| Married-Couple Family | 812,249, 41.94%, see rank | 49.36% | 49.60% |
| Nonfamily Households | 733,060, 37.86%, see rank | 33.72% | 33.25% |
ACS 2005-2009 data
Total population: 5,257,001
| Cook County | Illinois | U.S. | |
| Total Households | 1,941,417, 100% | 4,749,388 | 112,611,029 |
| Average Household Size | 2.66, see rank | 2.62 | 2.60 |
| 1 Person Households | 614,951, 31.68%, see rank | 28.40% | 27.32% |
| 2 or More Person Households | 1,326,466, 68.32%, see rank | 71.60% | 72.68% |
| Family Households (Families) | 1,209,994, 62.33%, see rank | 66.09% | 66.67% |
| Average Family Size | 3.52, see rank | 3.34 | 3.27 |
| Married-Couple Family | 819,325, 42.20%, see rank | 49.35% | 49.71% |
| Nonfamily Households | 731,423, 37.67%, see rank | 33.91% | 33.33% |
US Census 2000 data
Total population: 5,376,741
| Cook County | Illinois | U.S. | |
| Total Households | 1,974,181, 100% | 4,591,779 | 105,480,101 |
| Average Household Size | 2.68, see rank | 2.63 | 2.59 |
| 1 Person Households | 580,001, 29.38%, see rank | 26.78% | 25.82% |
| 2 or More Person Households | 1,394,180, 70.62%, see rank | 73.22% | 74.18% |
| Family Households (Families) | 1,269,592, 64.31%, see rank | 67.63% | 68.06% |
| Average Family Size | 3.38, see rank | 3.23 | 3.14 |
| Married-Couple Family | 868,244, 43.98%, see rank | 51.26% | 51.66% |
| Nonfamily Households | 704,589, 35.69%, 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.