A third of Santa Ana renters live with more than one person per room. The 11 most crowded cities are all in California.

There's a number underneath rent that tells you what a market is actually doing to the people in it. The Census Bureau counts a household as crowded when it has more than one person per room, and in Santa Ana, 33.6% of renter households live that way.

Rank every large US city by that figure and the top eleven are all in California. Not mostly... but All of them.

The most crowded rental markets

The first non-California city is Yonkers at 14.7%. The least crowded large cities, Cleveland and Scottsdale, are both at 2.0%, so Santa Ana runs at nearly seventeen times their rate.

Why it clusters in one state

Crowding is what happens when rent outruns wages and there's nowhere cheaper to go. Santa Ana's typical rent is $2,781 in a city where the median renter earns far less than the coastal tech corridor, and the math for a working family simply doesn't close in a two-bedroom. So a three-generation household takes the two-bedroom, or two families take a three-bedroom, and the rent gets paid.

California has the worst version of this because it combines three things at once: the country's highest rents outside New York, large immigrant and working-class populations in the exact cities on this list, and decades of underbuilding that left no cheaper ring to move to. Fresno at $1,967 is the cheapest city in the table and still has 18.1% of renters doubled up, which tells you the problem is wages against rent rather than rent alone.

Fremont and San Jose are the more surprising entries. Both have renter incomes above $100,000, and both still show one in six renter households over the line. At those rents, even a strong income doesn't buy enough rooms for a family.

What the number is good for

Crowding is a better hardship measure than the rent-to-income ratio, because a household that's doubled up has already made the adjustment the ratio only threatens. It's also a lagging one, since people crowd in after years of pressure rather than the month rent goes up, which is why the Sun Belt cities with recent spikes don't appear here yet.

For a renter comparing cities, a low crowding rate is a sign that the local rent is survivable at local wages. For anyone reading a rent report, it's the number that separates a city that's expensive from a city that's expensive in a way people can't absorb. We looked at the same pressure from the housing-size angle in why families with kids are the most rent-burdened.

Sources

• US Census Bureau, American Community Survey, table B25014, occupants per room by tenure, 2023 five-year estimates

• RentDataNow city rent data, anchored to the Zillow Observed Rent Index, June 2026