Northwest Philadelphia is a section of the city of Philadelphia, Pennsylvania. The official boundary is Stenton Avenue to the north, the Schuylkill river to the southwest, Northwestern Avenue to the northwest, Roosevelt Boulevard to the south, and Wister Street and Stenton Avenue to the east. The area is divided by Wissahickon Creek into two subsections, Upper Northwest and Lower Northwest Philadelphia. Upper Northwest are Germantown, Mount Airy (which itself is divided into east and west), and Chestnut Hill, and Lower Northwest are Roxborough, East Falls, and Manayunk. Some of them informally comprise smaller neighborhoods. The Philadelphia Police Department patrols two districts located within Northwest Philadelphia. The two patrol districts serving Northwest Philadelphia are the 5th and 14th districts.