Philadelphia County, Pa., has among the highest number of commuters coming from another county in the nation, the U.S. Census Bureau reported today in new estimates released from the American Community Survey. Nationally, 27.4 percent of workers commute outside the county where they live.

Among workers in Philadelphia County, 253,071 live outside the county, according to 2006-2010 estimates from the American Community Survey. For example, 60,159 workers commute in from Montgomery County, 51,457 from Delaware County and 33,877 from Bucks County.

Meanwhile, 146,825 residents of Philadelphia County leave the county for work, with 60,551 going to Montgomery County (which was not significantly different from the number of workers coming in from the county), 26,028 to Bucks County and 17,732 to Delaware County.

"It is well known that Philadelphia County draws a lot of commuters to work. The detailed information in the American Community Survey tells us where Philadelphia County workers are coming from, where its residents work, and how its commuting patterns compare to those of other large counties," said Brian McKenzie, a Census Bureau statistician who studies commuting. "This information shapes our understanding of the boundaries of local and regional economies, as people and goods move across the nation's transportation networks."

The American Community Survey also provides annual estimates about how commuters in Philadelphia County travel to work and how long it takes them to get there.