Nearly 10.7 billion trips in 2013, to be precise—the highest total since 1956.
The new numbers come from the American Public Transportation Association.
Transit ridership has now fully recovered from a dip caused by the Great Recession. With services restored following economy-driven cutbacks, the numbers appear set to continue what had been a steady increase.
Expanding bus and train networks help spur the growth, as does the nation's urban shift.
The sprawling city of Houston had a large ridership gain. So did Los Angeles, Seattle, Miami, Denver and San Diego.
The New York area's behemoth transit network saw the greatest gain, accounting for one in three trips nationally.