Greenacres is a north eastern suburb of Adelaide, South Australia in the City of Port Adelaide Enfield. It is considered as an inner suburb of greater Adelaide. Hampstead Road and Muller Road intersect at the south west corner of Greenacres, making it a bustling area during rush hour. These form the western and southern boundaries of the suburb, with Fosters Road on the east and Redward Avenue on the northern boundary. Greenacres is home to the Greenacres Shopping Centre, which has as its major shops a Coles supermarket (formerly a BI-LO), The Reject Shop and Sam's Warehouse. The City of Port Adelaide Enfield Greenacres Library & Office is located to the east of the shopping centre precinct. The suburb also features Hampstead Barracks, a small suburban Australian Army base.