Darlington is a suburb of Adelaide, South Australia part of which is in the City of Onkaparinga and the City of Marion. For many years, Darlington was the southern entrance to Adelaide's urban area on Main South Road. It hosted many service stations of different brands. It represents the convergence of Flagstaff Road to Main South Road from the south, with Seacombe Road to the west, Diagonal Road to the northwest and Marion Road to the north with South Road continuing northeast. The new upgrades are taking place here and most are complete.