North Cambridge, also known as "Area 11", is a neighborhood of Cambridge, Massachusetts bounded by Porter Square and the Fitchburg Line railroad tracks on the south, the city of Somerville on the northeast, Alewife Brook and the town of Arlington on the northwest, and the town of Belmont on the west. In 2005 it had a population of 10,642 residents living in 4,699 households, and the average income was $44,784.