Castle Sowerby is a civil parish in the Eden District of Cumbria, England. In 2001 it had a population of 337,[1] increasing to 344 at the 2011 Census,[2] and includes the hamlets of How Hill, Millhouse, Newlands, Sour Nook, Southernby and Sowerby Row.
Located 3 miles (4.8 km) north of Sowerby Row is Thistlewood Farmhouse, consisting of a pele tower probably built in the early 15th century, with 16th century alterations, and an extension built in the late 17th century.[3]