It was an important transportation centre as it was located at the head of navigation on the Miramichi River and had wharves for the export of lumber and other forest products.
Newcastle was first settled by Scottish settlers, led by William Davidson (lumberman) in the late 18th century, and was originally called Miramichi.
A shipbuilding industry developed in the area during the late 18th century, largely to facilitate overseas lumber exports, including masts for the British Navy.
The 1952 discovery of base metal deposits and the development of Heath Steele Mines, 60 km northwest of Newcastle, allowed the economy to diversify and strengthen through the 1960s.
The famous British newspaper owner and Minister of Aircraft Production during World War II, Max Aitken (Lord Beaverbrook), moved to Newcastle at an early age and considered it home.