A list of the leading cities of Magna Graecia would include:
Syracuse – a powerful city-state aligned with Sparta and Corinth
Tarantum – a wealthy and powerful seaport, center of trade with Greece, powerful enough to pursue expansion
Neopolis (Naples) – seaport and ally of the Romans against Carthage
Cumae – early Greek settlement, defeated by the Oscans in 421 BC, survivors founded Neopolis
Paestum – also defeated by the Oscans, stayed loyal to Rome against Hannibal
Rhegium – ally of Syracuse, occupied by the Romans during the First Punic War
Thurii – late Greek colony, constantly under attack from neighbors, defended by Rome