But they're not alone: roughly half the nation lives with unhealthy concentrations of ozone or particulate pollution.
New York and L.A. are losing more Americans than they're gaining, but the flood of immigrants more than makes up for it.
In a city where nine in ten drive to work, the answer could reshape the future.
The population of cities with more than a million people jumped 3.2 percent, much better than the 2.4 percent for the U.S. overall.
Questioning the numbers behind the new ridership "record."
How U.S. cities stack up economically worldwide.
A complicated geography of churches, produce, and beer.
Car culture may not be making us sick. Cities aren't necessarily healthier than suburbs.
Kyle Naegeli of Texas says he's hauling in nice-sized catfish and bluegills from his suburban storm drain.
And other eye-popping comparisons.
Our series drew impassioned responses from city boosters and haters alike.
Young professionals see the Texas boom town as a bastion of the traditional American Dream.
Major urban areas are magnets for the uninsured, and the state politicians who turned down the Medicaid expansion are not the ones who will pay to treat them.
Though now likely doomed for demolition, when the Astrodome first opened in 1965, it was a profoundly American invention.
Voters will decide whether or not they want Harris County to put up $217 million in bonds to turn it into a convention facility.
The new geography of being young in America.
California is on its way, and the Midwest, the Northeast Corridor, and Texas all have plans of their own.
Our weekly roundup of the most intriguing articles about cities and urbanism we've come across in the past seven days.
This Sunday's demolition looked like a massive doughnut hole forming in the middle of a department store.