See the Pew Charitable Trust's Philadelphia Research and Policy Initiative.

Check out the University City District's State of University City Report, as well as its supplement.

Also look at Philadelphia County data from from the United States Census Bureau.

In addition, refer to demographic data available from the Pennsylvania State Data Center.

Also, take a look at these Penn Libraries' research guides: Philadelphia Studies and Philadelphia Maps and Geographic Information

See also:
How do I find demographic data?