What city has its council offices in the suburb of Sturt and contains part of O'Halloran Hill, South Australia?
O'Halloran Hill, South Australia:  The suburb is split between the Cities of Marion and Onkaparinga, and it neighbours Happy Valley, Hallett Cove, Trott Park and Darlington. City of Marion: The City of Marion is a local government area in part of the southern and western suburbs of Adelaide, South Australia.
City of Marion