The percentage of single-person households in the US has been steadily increasing since the 1960’s (though the rate of increase has moderated in recent decades). As of last year (2018), 28% of Americans lived alone, according to the US Census Bureau. So about 1 in 4 households. This is in comparison to 13.1% of households in 1960.
Here is a chart from a recent WSJ article on the topic:
Not surprisingly, this is changing how marketers target households. Affluent, single-person households in urban areas have proven to be a boon to product makers because they tend to spend more per person and they tend to value time > money. Of course, this phenomenon also has implications for those of us who work as city builders.
For more historical household tables from the US Census Bureau, click here.
BRANDON DONNELLY 
Based on your numbers, 100 – 28 = 72% of Americans lived in households with more than two people. The comparison should be 28% vs 36% (or less). That’s close to saying that nearly half of the US households have only one resident. I never would have guessed.
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