O'Halloran Hill in South Australia is a suburb of Hallet Cove, with a population of over 12000 people.
O'Halloran Hill is a suburb in the south of Adelaide, South Australia, situated on the hills south of the O'Halloran Hill Escarpment, which rises from the Adelaide Plains and located 18km from the city centre via the Main South Road. 
 The suburb is split between the Cities of Marion and Onkaparinga, and it neighbours Happy Valley, Hallett Cove, Trott Park and Darlington. 
Hallett Cove is a coastal suburb in the south of Adelaide, South Australia, with a population of more than 12,000 people. 
