Butterworth (ancient township), a former township centred on Milnrow, in the then Parish of Rochdale, England. RMAF Butterworth, air base near Butterworth, Penang. Butterworth, Eastern Cape, now also known as Gcuwa, a town located in South Africa. Butterworth, Penang, the principal town of Seberang Perai in the state of Penang, Malaysia.