Philadelphia didn't budge a bit from its 2008 ranking, which is just fine since the city didn't become any tougher to navigate during that time.
Any tourist who's seen Independence Hall and stopped into a Wawa for Tastykakes and directions can tell you that the city's most walkable neighborhoods in Center City, the Old City and along the riverfront near Penn's Landing are some of the easiest to navigate in the country. What locals probably won't tell the average cheesesteak-chomping out-of-towner is just how easy it is to get around South Philly and its surrounding neighborhoods. Let the new folks have Manyunk and Northern Liberties if they must, but brotherly love has to end somewhere.
Except for the extreme northeast, southwest and northwest corners of the city, much of Philadelphia's fairly easy to get around. About 95% of the city is easily accessible by means other than a car, but it's just a matter of doing so.
There's no shortage of cars in this town, and the city's conflicted relationship with the Southeaster Pennsylvania Transit Authority may have something to do with it. Septa's bus, subway, light rail and commuter rail services handled 327.6 million passengers this year, including travelers taking the airport line right into Center City. That's great and all, but it's still less than the ridership of a Boston MBTA that covers a city nearly one-third Philadelphia's size and a greater metro area with about 1.5 million fewer people.
Bicycles, cabs and other alternative transportation picks up the slack, but when Philly's described as "walkable," there's a big emphasis on the "walk" portion.