The naming system of the streets differs by neighborhood, although the main north-south streets are numbered in South Philadelphia, West Philadelphia, and Lower North Philadelphia similar to how they are numbered in Center City. One example of a naming system is in South Philadelphia, where east-west streets use the surnames of former governors of Pennsylvania, starting with Reed Street and ending with Pattison Avenue. Several east-west streets in North Philadelphia are named after counties in Pennsylvania. Many other streets are named after locally or nationally significant people. During the 20th century, several streets were renamed to honor individuals, such as John F. Kennedy Boulevard.