Number of households in the United States from 1970 to 2013, by size of household (in millions)

Year One person Two persons Three persons Four persons Five persons Six persons Seven persons or more
2013 33.57 41.5 19.28 16.36 7.43 2.74 1.58
2012 33.19 40.98 19.24 16.05 7.27 2.73 1.62
2010 31.4 39.5 18.6 16.1 7.4 2.8 1.7
2009 31.7 39.2 18.6 16.1 7.1 2.6 1.5
2005 30.14 37.45 18.29 16.38 7.17 2.5 1.43
2000 26.7 34.7 17.2 15.3 7 2.4 1.4
1995 24.73 31.83 16.83 15.32 6.62 2.28 1.38
1990 23 30.1 16.1 14.5 6.2 2.1 1.3
1985 20.6 27.4 15.5 13.6 6.1 2.3 1.3
1980 18.3 25.3 14.1 12.7 6.1 2.5 1.8
1975 13.9 21.8 12.4 11.1 6.4 3.1 2.5
1970 10.9 18.3 10.9 10 6.5 3.5 3.2
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This graph shows the number of households in the U.S. by size of household from 1970 to 2013. In 2013, about 33.5 million people in the United States lived alone.

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You can find additional information about this statistic on statista.com
http://www.statista.com/statistics/183779/number-of-households-in-the-us-by-size-of-household/