- Coordinates: 22° 55′ 37″ N, 37° 53′ 56″ W
Markopoulo (), municipally Markopoulo Mesogeias to avoid confusion with Markopoulo Oropou in Oropos (Greek, Modern: Μαρκόπουλο, Ancient/Katharevousa: -on, municipal form: Μαρκόπουλο Μεσογειας) older form: Markopoulon is a suburban town in southeastern Attica in the Mesogeian plain north of the mountains, approximately 30 km SE of Athens, S of Rafina, S of the Eleftherios Venizelos International Airport, SW of the Attiki Odos (numbers 6 and 62) and N of Lavrio. Markopoulo is linked with GR-91 (Glyka Nera - Sounio) and are two-lanes stretching down to Lavrio. Since the late-20th century, Markopoulo is bypassed to the southwest. Markopoulo once had a railway station and was linked with rail linking near Kifissia and Lavrio. Markopoulo also has the only road linkinbg north to Artemis/Loutsa/ Today, the nearest Proastiakos rail lies to the north. A part of Markopoulo includes Porto Rafti.
During the 2004 Summer Olympics, Markopoulo was world-famous for its equestrian centre (Markopoulo Olympic Equestrian Centre) to the southeast and about 3 km from the main route into the mountains and the shooting centre (Markopoulo Olympic Shooting Centre) located in the hills southwest of town and about 2.5 km west of the highway. The sporting centres after the Olympics are shut down for future uses. The mountains lies to the south and the southeast and a taller one to the southeast which the northwestern portion is used for a huge mining area which is about 70 ha of land. Farmlands surround the northern part while a valley area lies to the south. More mountains are further southwest. The panorama of other mountains includes the Hymettus to the northwest and the Penteli to the north.
The population were rural until the 1970s and the 1980s, the population became urban as suburban housing popped up in the 1980s and the 1990s but the population lost and later slowed. Housing developments slowly continues to this day and some are sporadically with farmlands or empty land.
Markopoulo has schools, lyceums, gymnasia, banks, churches, a post office, beaches, a theatre named Sarras and squares (plateies). Its nearest beach is located to the east.
Division of the municipality
Markopoulo, Athens, Satellite image