Average size of a family in the US 1960-2018

Average number of people per family in the United States from 1960 to 2018

by Erin Duffin, last edited Apr 29, 2019
Average size of a family in the US 1960-2018 This graph shows the average number of people per family in the U.S. from 1960 to 2018. The average American family in 2018 consisted of 3.14 persons.
Families in the United States

According 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 2018, the U.S. Census Bureau counted about 83.09 million families in the United States. The average family consists of 3.14 persons in 2018, 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 41.4 percent in 2017.

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 3.63 and 3.6 members respectively. The smallest families can be found in North Dakota and Vermont, with an average size of 2.94 and 2.93 members respectively.
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Average number of people per family in the United States from 1960 to 2018

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