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 2,641,511 people (in 2011) within an area of . 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.