Ajax (2006 population 90,167) is a town in the Durham Region in the Greater Toronto Area. The town is named for the HMS Ajax a Royal Navy cruiser that served in World War II. Ajax is a part of the Greater Toronto Area. It is approximately 25 kilometres (16 mi) east of Toronto on the shores of Lake Ontario and is bordered by the City of Pickering to the west and north, and the Town of Whitby to the east.
Shopping was virtually non-existent in the mid-1940s, but by 1970 major shopping centres such as Ajax Plaza, Harwood Place Mall and Clover Ridge Plaza were constructed. The 1980s saw an expansion of retail shopping malls to include Discovery Bay Plaza, Transit Square, Baywood Plaza, Westney Heights Plaza and most recently the Durham Centre at Harwood Avenue and Kingston Road.
Before the Second World War, the territory in which Ajax is situated was a rural part of the township of Pickering. The town itself was first established in 1941 when a Defence Industries Limited (D.I.L.) shell plant was constructed and a townsite grew around the plant. By 1945 the plant had filled 40 million shells; employed over 9,000 people at peak production; boasted of its own water and sewage treatment plants; a school population of over 600; 50 km (31 mi) of railroad and 50 km (31 mi) of roads. The entire D.I.L. plant site included some 12 km2 (5 sq mi). People came from all over Canada to work at D.I.L.