Nea Filadelfeia is a suburb of Athens, 6 km (4 mi) north of the city centre. Its built-up area is continuous with that of municipality of Athens and the surrounding suburbs Nea Chalkidona, Agioi Anargyroi, Acharnes, Metamorfosi and Nea Ionia. The A1 motorway (Athens - Thessaloniki) and Greek National Road 1 pass through the town. Nea Filadelfeia has a large park, Alsos Neas Filadelfias, which covers 0.48 square kilometres (0.19 sq mi). The park formerly hosted a large zoo which operated since 1955 to 1995. Nea Filadelfeia is roughly located at the geographical center of the Attica peninsula, around 13 km from the sea to the south suburbs and at a low elevation.
Nea Filadelfeia is the historical home of A.E.K., a major Greek Multi-Sports Club established in 1924 in Nea Filadelfeia. It is also the home of Ionikos Nea Filadelfeia. The now demolished Nikos Goumas Stadium was the home ground of AEK F.C. from 1930 to 2003, while the Agia Sophia Stadium is the new home ground from 2022. The Ionikos Nea Filadelfeia sports club is renowned in Greece and abroad for its handball, volleyball and basketball achievements.
Nea Filadelfeia has a hot-summer Mediterranean climate (Csa). The area is notorious in Greece for its summer heat; according to the Hellenic National Meteorological Service (HNMS) it registers Greece's highest mean maximum summer temperatures for the period 1955-1997.[4] On 26 June 2007, during the 2007 European heat wave, Nea Filadelfeia recorded 46.2 °C (115.2 °F) while, on the same day, the nearby automatic HNMS weather station recorded 47.5 °C (117.5 °F), which is Europe's highest June temperature to date.[5][6]