Athens instance of capital city
Administration
The large City Centre (Greek: Κέντρο της Αθήνας) of the Greek capital falls directly within the Municipality of Athens or Athens Municipality (Greek: Δήμος Αθηναίων)—also City of Athens. Athens Municipality is the largest in population size in Greece. Piraeus also forms a significant city centre on its own, within the Athens Urban Area and it is the second largest in population size within it.Athens Urban Area
The Athens Urban Area (Greek: Πολεοδομικό Συγκρότημα Αθηνών), also known as Urban Area of the Capital (Greek: Πολεοδομικό Συγκρότημα Πρωτεύουσας) or Greater Athens (Greek: Ευρύτερη Αθήνα), today consists of 40 municipalities, 35 of which make up what was referred to as the former Athens Prefecture municipalities, located within 4 regional units (North Athens, West Athens, Central Athens, South Athens); and a further 5 municipalities, which make up the former Piraeus Prefecture municipalities, located within the regional unit of Piraeus as mentioned above.The Athens Municipality forms the core and center of Greater Athens, which in its turn consists of the Athens Municipality and 40 more municipalities, divided in four regional units (Central, North, South and West Athens), accounting for  2,611,713  people (in 2021) within an area of 361 km2 (139 sq mi). Until 2010, which made up the abolished Athens Prefecture and the municipality of Piraeus, the historic Athenian port, with 4 other municipalities make up the regional unit of Piraeus.
The regional units of Central Athens, North Athens, South Athens, West Athens and Piraeus with part of East and West Attica regional units combined make up the continuous Athens Urban Area, also called the "Urban Area of the Capital" or simply "Athens" (the most common use of the term), spanning over 412 km2 (159 sq mi), with a population of  3,059,764 people as of 2021. The Athens Urban Area is considered to form the city of Athens as a whole, despite its administrative divisions, which is the largest in Greece and one of the most populated urban areas in Europe.
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