No. 004 · 13 Aug 2026 · Society
Living alone used to be rare in America. Today it is second only to two-person households — and the shift is driven more by delayed marriage and financial independence than by population growth.
In 1900, living alone was rare in America. Most households were large, with families, grandparents, and often a boarder or two, all under one roof. Only about 1 in 20 households had just one person in them.
More than 100 years later, that structure has transformed. Today, close to 3 in 10 American households consist of a single person living alone — placing solo living second only to two-person households (which sit at 34%). This didn’t happen just because the country got bigger. It happened because the way Americans marry, work, and support themselves has fundamentally changed.
The numbers are striking. In 1900, 1-person households made up 5.1% of all U.S. households. By 2024, that number had climbed to 28.9%. Average household size dropped from 4.6 people to 2.5. The typical (median) household fell from 4 people to 2.
Big households nearly disappeared, too. In 1900, households with 7 or more people made up almost 1 in 5 of the total. By 2024, that share was down to just 1.5%.
One thing worth flagging: that 29% figure is a share of households, not people. A person living alone counts as an entire household on their own. So living alone actually makes up a smaller share of the overall population than of the household count: 11.6% of Americans living in households lived alone in 2024, up from just 1.1% in 1900. Both are record highs, but they measure different things.
This didn’t happen all at once. Living alone grew slowly through the early 1900s. Then it sped up fast between 1960 and 2000, a period marked by more divorce, later marriages, and more women joining the workforce. After 2000, the trend leveled off for about 20 years, then ticked back up after 2021.
The flip side of this story is marriage. In 1940, married couples ran 76% of U.S. households. By 2024, that share was down to 47% — even as solo living rose from under 8% to 29% over the same stretch. The two trends move together, almost like opposite ends of a seesaw.
No single reason explains a shift this big. But researchers who study it, including the Census Bureau and housing economists at Harvard’s Joint Center for Housing Studies, point to a few key forces: Americans are marrying later or not at all, divorce is far more common, and women’s growing financial independence means fewer people need to share a home out of economic necessity. On top of that, higher overall national prosperity allows more individuals to afford solo living.
One popular explanation for this trend doesn’t hold up, however: that it is primarily driven by an aging population. Pew Research found that the share of Americans 65 and older who live alone has actually fallen since 1990, from 29% to 26%, largely because older women are staying married longer. The primary engine behind the national surge in solo living has been adults under 65, not retirees.
A quick note on the numbers: “household” means everyone living together in one housing unit. It doesn’t include dorms, nursing homes, or other group housing. The 1900 figures come from the Census Bureau’s own historical records, with one small caveat: the Bureau had to estimate its “7-or-more” category that year, based on an assumption about group-housing sizes. The 2024 figures come from the Census Bureau’s American Community Survey, its main yearly household survey.
U.S. Census Bureau, Demographic Trends in the 20th Century (2002), Table 13; U.S. Census Bureau, American Community Survey 1-year Detailed Tables B25008, B25009, and B25010 (2024); Pew Research Center, “A smaller share of older U.S. adults live alone today than in 1990” (2025); Joint Center for Housing Studies of Harvard University, “The Rise of the Single-Person Household.”
Research, analysis & visualization: B. Andre