Megalopolis
Pittsburgh has a population of 350, 363, with a median age of 33 years. Population density is 5500 people per square mile. The top three races that make up Pittsburgh are,White, Black and Asian with a per capita income of $18,000. The unemployment rate is currently at 4.25 %. It is the 13th largest city in the U.S and is 500 miles from the cities that are a part of Megalopolis, with its neighbor being Philadelphia. The major religions are, Protestant, Catholic and Jewish. "The Pittsburgh area is at the center of an extensive highway system focused around Interstates 70, 80 and 76/376 (the Pennsylvania Turnpike) which run east and west, and Interstate 79/279 that runs north and south."Being a part of Allegheny County, there more than 1,700 bridges and 720 are within the Pittsburgh city limits. Because its location near the Allegheny and Ohio River  bridges are necessary for transportion. Pittsburgh is the largest inland port in the U.S., providing access to the nation's 9,000 mile inland waterway system.


Sources:
http://pittsburgh.about.com/cs/aboutpittsburgh/a/facts.htm
http://www.city-data.com/us-cities/The-Northeast/Pittsburgh-Population-Profile.html
http://www.city-data.com/us-cities/The-Northeast/Pittsburgh-Transportation.html
http://pittsburgh.net/about_pittsburgh.cfm
http://pghbridges.com/articles/p1969.JPG