By Katie Park, Ted Mellnik and Emily Badger
The Washington Post - August 18, 2015
Our lives are heavily shaped by two points of geography: where we
live and where we work. Those locations determine how long we spend
commuting, how we plan our errands, where and with whom we socialize
(admit it — you've turned down a dinner invite because it just wasn't on
your way home).
Add up all of these daily trips across thousands
or millions of people, and commuting patterns shape whole metropolitan
areas, too. They determine where congestion occurs, how we invest in
infrastructure and housing, and how populations ebb and flow over the
course of the day. Take Manhattan: A borough of about 1.5 million
people, the island swells most days to a daytime population that's twice as large, thanks to commuters.
The above map, based on new five-year American Community Survey data released last week,
illustrates these commutes for the 38 million Americans who leave the
counties where they live when they head to work most days. In the
District of Columbia, for instance, about 95,000 workers come in each
day from Fairfax County. Nearly 140,000 do from Prince George's County.
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