Average size of U.S. families by state 2021

In 2021, the average size of families in Utah was 3.51 people, the largest out of any state. California, Hawaii, Texas, and Alaska rounded out the top five states with the largest average family size in that year. Nationwide, the average family size was 3.15 people.

Average size of families in the United States in 2021, by state

Characteristic	Average size of family
United States	3.15
Utah	3.51
California	3.44
Hawaii	3.41
Texas	3.27
Alaska	3.25
Georgia	3.23
Nevada	3.22
Idaho	3.21
New York	3.2
Louisiana	3.19
New Jersey	3.17
Mississippi	3.17
Maryland	3.16
Alabama	3.15
Illinois	3.15
New Mexico	3.15
Oklahoma	3.12
Virginia	3.12
Arizona	3.08
South Dakota	3.08
Washington	3.08
Kansas	3.08
Nebraska	3.07
Florida	3.07
Indiana	3.07
North Carolina	3.07
Arkansas	3.07
South Carolina	3.06
Tennessee	3.06
Delaware	3.06
Missouri	3.06
Michigan	3.05
Colorado	3.05
Minnesota	3.05
Kentucky	3.04
Massachusetts	3.04
Connecticut	3.04
District of Columbia	3.03
North Dakota	3.02
Pennsylvania	3.01
Rhode Island	3
Ohio	3
Iowa	2.99
Montana	2.99
Oregon	2.99
West Virginia	2.99
New Hampshire	2.96
Wyoming	2.95
Wisconsin	2.94
Vermont	2.82
Maine	2.79

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Release date

September 2022

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Region

United States

Survey time period

2021

Supplementary notes

According to the definition by the U.S. Census Bureau a household "includes all of the people who occupy a housing unit. One person in each household is designated as the “householder.” In most cases, this is the person, or one of the people, in whose name the home is owned, being bought, or rented."
A family "consists of a householder and one or more other people living in the same household who are related to the householder by birth, marriage, or adoption."

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