hanesyddol Sir Fynwy . Mae'n ran o etholaeth seneddol Islwyn . Roedd poblogaeth o 4793 yn ystod cyfrifiad 2001. English: Abercarn is a small town community in Caerphilly county borough , Wales , 10 miles (16 km) north-west of Newport on the A467 between Cwmcarn and Newbridge , within the historic boundaries