Coquitlam is situated some 10 to 15 km (7 to 10 miles) east of Vancouver, where the Coquitlam River connects with the Fraser River and extends northeast along the Pitt River toward the Coquitlam and Pitt lakes. Coquitlam borders Burnaby and Port Moody to the west, New Westminster to the southwest, and Port Coquitlam to the southeast. Burke Mountain, Eagle Ridge, and 1,583 m (5,194 ft) tall Coquitlam Mountain form the northern boundary of the city. Coquitlam's area, 152.5 square kilometres (58.9 sq mi), dwarfs the other communities in the Tri-Cities; it is about six times larger than either Port Moody or Port Coquitlam.

Coquitlam Town Centre, was designated as a "Regional Town Centre" under the Metro Vancouver’s Livable Region Strategic Plan. The concept of a town centre for the area dates back to 1975, and is intended to have a high concentration of high-density housing, offices, cultural, entertainment and education facilities to serve major growth areas of the region, served by rapid transit service. It is in the town centre that many public buildings can be found, including City Hall, a branch of the Coquitlam Public Library, R.C.M.P. station, Coquitlam's main fire hall, the David Lam Campus of Douglas College, the Evergreen Cultural Centre, City Centre Aquatic Complex, Town Centre Park and Percy Perry Stadium. Coquitlam Town Centre is currently undergoing an update of the Town Centre plan.