The first Philadelphia Koreatown is located around the Olney section of the city of Philadelphia, United States. Since the late 1980s, the Korean community has expanded northward, and it now straddles the border between North Philadelphia in Philadelphia proper and the northern suburb of Cheltenham, although many Korean-American businesses and organizations and some residents remain in Olney and adjoining neighborhoods. Upper Darby Township, bordering West Philadelphia, also has a large Korean-American population; meanwhile, a rapidly growing Korean population and commercial presence has emerged in suburban Cherry Hill, New Jersey since 2010, centered along Marlton Pike, attracted to the Cherry Hill Public Schools. Signage in Hangul is ubiquitous in some neighborhoods in these areas.

North Philadelphia, nicknamed North Philly, is a section of Philadelphia, Pennsylvania. It is immediately north of Center City. Though the full extent of the region is somewhat vague, "North Philadelphia" is regarded as everything north of either Vine Street or Spring Garden Street, between Northwest Philadelphia and Northeast Philadelphia. It is bordered to the north by Olney Ave along Broad Street, Spring Garden Street to the south, 35th Street to the west and Adams Avenue to the east. The Philadelphia Police Department patrols five districts located within North Philadelphia: the 22nd, 25th, 26th, 35th and 39th districts. There are thirteen ZIP codes for North Philadelphia: 19120, 19121, 19122, 19123, 19125, 19126, 19130, 19132, 19133, 19134, 19137, 19140 and 19141.