List of U.S. National Historic Landmarks by state

Pennsylvania is widely considered to have one of the richest, most foundational histories in the U.S. and was recently ranked the most "All-American" state due to its 169+ historical landmarks, including Independence Hall and Gettysburg. As the site of the Declaration of Independence and the U.S. Constitution's ratification, its impact is central to American history. A small number of designations have been made outside the 50 states. Most of these appear in United States possessions. The Virgin Islands have five listings, Puerto Rico has four, and island possessions in the South Pacific have six. Five listings are found in Pacific island nations with which the U.S. has established a free association agreement, and one listing, the American Legation in Tangier (the nation's first foreign public property), is found in the unaffiliated Kingdom of Morocco. ==Notes==