Newcastle is located about 80 km east of Toronto, and about 18 km east of Oshawa and Bowmanville on Highway 401. It is also the southern terminus of Highway 35 and Highway 115. Newcastle was incorporated as a town in 1856. It remained a small community until the 1990s, when new residential development began and the population quickly swelled. Newcastle is surrounded by farms raising cattle, pigs, apples, grain, and corn.