The Puente Hills lie to the south of the San Gabriel Valley and the Pomona Freeway (State Route 60), to the east of the San Gabriel River Freeway (Interstate 605), to the north of Whittier Boulevard, and to the west of the city of Diamond Bar and Chino Hills. Cities to its north are the City of Industry, Hacienda Heights, and Rowland Heights. To the south are Whittier, La Habra Heights, and Brea. The Brea-Olinda Oil Field, discovered in 1880 and still producing in 2014, is in the southernmost portion of the hills adjacent to the city of Brea.