Frederiksberg is a part of the Capital Region of Denmark. It is formally an independent municipality, Frederiksberg Municipality, but is typically treated as a part of Copenhagen. It occupies an area of less than 9 km2 and had a population of 103,192 in 2015. Frederiksberg is an enclave surrounded by Copenhagen Municipality and there is no clear border between the two. Some sources ambiguously refer to Frederiksberg as a quarter or neighbourhood of Copenhagen. However, Frederiksberg has its own mayor and municipal council, and is fiercely independent.
Frederiksberg is considered to be an affluent, or "posh", area and is characterised by its many green spaces, such as the Frederiksberg Gardens and Søndermarken. Some institutions and locations that are widely considered to be part of Copenhagen are actually located in Frederiksberg. For example, Copenhagen Zoo as well as several stations of the Copenhagen Metro (the stations Forum, Frederiksberg, Fasanvej, Lindevang, and Flintholm) are located in Frederiksberg. The Copenhagen S-train system also has several stations in Frederiksberg, including Peter Bangs Vej station and Flintholm station.
Frederiksberg, which lies west of central Copenhagen, is completely surrounded by boroughs forming part of the city of Copenhagen – the result of an expansion of the Copenhagen Municipality's boundary in 1901, which nevertheless did not include Frederiksberg in the list of municipalities to be incorporated in the enlarged area. Frederiksberg is thus effectively a municipal island within the country's capital – a unique phenomenon in present-day Europe. Other than administratively, however, it is largely indistinguishable in character from the districts of Copenhagen city which surround it.
Frederiksberg has several stations on the Copenhagen Metro system, and is home to the tallest residential structure in Denmark and the second tallest residential building in Scandinavia: the 102-metre high Domus Vista.