Washington Square, originally designated in 1682 as Southeast Square, is a 6.4 acres (2.6 ha) open-space park in Center City, Philadelphia, The southeast quadrant and one of the five original planned squares laid out on the city grid by William Penn's surveyor, Thomas Holme. It is part of both the Washington Square West and Society Hill neighborhoods. In 2005, the National Park Service took over ownership and management of Washington Square, through an easement from the City of Philadelphia. It is now part of Independence National Historical Park.

Society Hill is a historic neighborhood in Center City Philadelphia, Pennsylvania, United States, with a population of 6,215 as of the 2010 United States Census. Settled in the early 1680s, Society Hill is one of the oldest residential neighborhoods in Philadelphia. After urban decay developed between the late 19th and early 20th centuries, an urban renewal program began in the 1950s, restoring the area and its many historic buildings. Society Hill has since become one of the most expensive neighborhoods with the highest average income and second-highest real estate values in Philadelphia. Society Hill's historic colonial architecture, along with planning and restoration efforts, led the American Planning Association to designate it, in 2008, as one of the great American neighborhoods and a good example of sustainable urban living.