USA.com / Maryland / Mount Airy, MD / 21771 / Population and Races / Historical Household and Family Data
21771 Zip Code Historical Household and Family Data
ACS 2010-2014 data
Total population: 29,558
| 21771 Zip Code | Maryland | U.S. | |
| Total Households | 9,996, 100% | 2,155,983 | 116,211,092 |
| Average Household Size | 2.94, see rank | 2.67 | 2.63 |
| 1 Person Households | 1,721, 17.22%, see rank | 26.95% | 27.57% |
| 2 or More Person Households | 8,275, 82.78%, see rank | 73.05% | 72.43% |
| Family Households (Families) | 7,966, 79.69%, see rank | 67.07% | 66.22% |
| Average Family Size | 3.37, see rank | 3.35 | 3.32 |
| Married-Couple Family | 7,018, 70.21%, see rank | 47.68% | 48.42% |
| Nonfamily Households | 2,030, 20.31%, see rank | 32.93% | 33.78% |
US Census 2010 data
Total population: 29,563
| 21771 Zip Code | Maryland | U.S. | |
| Total Households | 9,845, 100% | 2,156,411 | 116,716,292 |
| Average Household Size | 2.98, see rank | 2.61 | 2.58 |
| 1 Person Households | 1,335, 13.56%, see rank | 26.11% | 26.74% |
| 2 or More Person Households | 8,510, 86.44%, see rank | 73.89% | 73.26% |
| Family Households (Families) | 8,126, 82.54%, see rank | 67.10% | 66.43% |
| Average Family Size | 3.28, see rank | 3.15 | 3.14 |
| Married-Couple Family | 7,013, 71.23%, see rank | 47.61% | 48.42% |
| Nonfamily Households | 1,719, 17.46%, see rank | 32.90% | 33.57% |
ACS 2008-2012 data
Total population: 29,101
| 21771 Zip Code | Maryland | U.S. | |
| Total Households | 9,800, 100% | 2,138,806 | 115,226,802 |
| Average Household Size | 2.96, see rank | 2.64 | 2.61 |
| 1 Person Households | 1,767, 18.03%, see rank | 27.12% | 27.45% |
| 2 or More Person Households | 8,033, 81.97%, see rank | 72.88% | 72.55% |
| Family Households (Families) | 7,669, 78.26%, see rank | 66.97% | 66.47% |
| Average Family Size | 3.44, see rank | 3.32 | 3.29 |
| Married-Couple Family | 6,845, 69.85%, see rank | 48.03% | 48.97% |
| Nonfamily Households | 2,131, 21.74%, see rank | 33.03% | 33.53% |
US Census 2000 data
Total population: 25,694
| 21771 Zip Code | Maryland | U.S. | |
| Total Households | 8,267, 100% | 1,980,859 | 105,480,101 |
| Average Household Size | 3.10, see rank | 2.61 | 2.59 |
| 1 Person Households | 940, 11.37%, see rank | 25.01% | 25.82% |
| 2 or More Person Households | 7,327, 88.63%, see rank | 74.99% | 74.18% |
| Family Households (Families) | 7,038, 85.13%, see rank | 68.62% | 68.06% |
| Average Family Size | 3.36, see rank | 3.13 | 3.14 |
| Married-Couple Family | 6,257, 75.69%, see rank | 50.21% | 51.66% |
| Nonfamily Households | 1,229, 14.87%, see rank | 31.38% | 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.