Yes, the Declaration of Independence was signed in Pennsylvania. The signing took place primarily at the Pennsylvania State House, which is now known as Independence Hall, in Philadelphia. This occurred mainly on August 2, 1776, although the document was adopted by the Continental Congress on July 4, 1776. Most of the 56 delegates from the Thirteen Colonies signed the engrossed document at this location. Independence Hall in Philadelphia is considered the birthplace of the United States because of this significant event.