What is the name of this independent municipality that has an area less than 9 km and has the street of Vesterbrogade running through it?
Vesterbrogade: Vesterbrogade is the main shopping street of the Vesterbro district of Copenhagen, Denmark. Vesterbrogade:  The 1.5 km long street runs from the City Hall Square in the east to Pile Allé in Frederiksberg in the west where it turns into Roskildevej. Frederiksberg:  It is formally an independent municipality, Frederiksberg Municipality, but is typically treated as a part of Copenhagen.
i don't know