I just moved to pittsburgh!  Have you ever been to the city?
No but I know it is a city located within the state of Pennsylvania 
Do they have any pro sports teams?
I don't know but they do have 30 skyscrapers as well as two inclined railways.
Wow!  It must be a densely populated city!  What are raised railway?
As of 2017 there were 305,704 people living within the city.
I thought it would have been more.  When was the city established?
that is just the population of the people within the city limits.  The population of the metropolitan area is 2,353,045.