"Pennsylvania" Scholastic Go.  (Click the "cities" link from the list at the top.  Check out the articles on Harrisburg, Erie, Philadelphia and Pittsburgh.)

Web Search and locate:
*The official web site for the city

*The wikipedia article for the city (The articles are usually monitored and edited by members of the local government, local businesses, and citizens.)
**Even better than the actual article are the links listed within and at the end of the article!

*The city's chamber of commerce site for local business and other links.

PA City Resources @ Your Library