Pennsylvania QuickInfo Est. Pop.: 12,293,400 Capital: Harrisburg Statehood: 1787 Nickname: Keystone State Motto: Virtue, Liberty, and Independence Official Website Census Info Fun Pa Factoid Pittsburgh has over 300 sets of city maintained steps. If they were stacked on top of each other, they would reach over 26,000 feet high. They would measure higher than a lot of the Himalayan Mountains.