KML is from Wikidata Commonwealth Avenue (colloquially referred to as Comm Ave by locals) is a major street in the cities of Boston and Newton, Massachusetts. It begins at the western edge of the Boston Public Garden, and continues west through the neighborhoods of the Back Bay, Kenmore Square, Boston University, Allston, Brighton and Chestnut Hill. It continues as part of Route 30 through Newton until it crosses the Charles River at the border of the town of Weston.