Families in the United StatesAccording to the U.S. Census Bureau, a family is a group of two people or more (one of whom is the householder) related by birth, marriage, or adoption and residing together; all such people (including related subfamily members) are considered as members of one family.
As of 2021, the U.S. Census Bureau counted about 83.9 million families in the United States. The average family consisted of 3.13 persons in 2021, down from 3.7 in the 1960s. This is reflected in the decrease of children in family households overall. In 1970, about 56 percent of all family households had children under the age of 18 living in the household. This percentage declined to about 40 percent in 2020.
The average size of a family household varies greatly from state to state. The largest average families can be found in Utah and Hawaii, with an average of 3.61 members respectively. The smallest families can be found in Vermont and Maine, with an average size of 2.88 and 2.85 members respectively.