Newton Aycliffe is a town in County Durham, England. Founded in 1947 under the New Towns Act of 1946, the town sits about five miles north of Darlington. It is the oldest new town in the north of England and forms the civil parish of Great Aycliffe. The population of Newton Aycliffe according to the UK census of 2011 was 26,633.
The article in Wikipedia also covers Great Aycliffe and the adjacent civil parish of Woodham.