Newtown is a small village in the civil parish of Calbourne, Newtown and Porchfield, on the Isle of Wight, England. In medieval times it was a thriving borough. Newtown is located 5 miles west of the town of Newport on the large natural harbour on the island's north-western coast. It is now mostly a national nature reserve owned and managed by the Nationa…Newtown is a small village in the civil parish of Calbourne, Newtown and Porchfield, on the Isle of Wight, England. In medieval times it was a thriving borough. Newtown is located 5 miles west of the town of Newport on the large natural harbour on the island's north-western coast. It is now mostly a national nature reserve owned and managed by the National Trust.