 Many landmark and contributing structures on the National Register are located in Smithfield including the Wentworth-Grinnan House.In 1732 a considerable portion of the northwestern part of the original shire was added to Brunswick County, and in 1748 the entire county of Southampton was carved out of it.During the American Civil War, Company F of the 61st Virginia Infantry Regiment of the Confederate Army was called the "Isle of Wight Avengers."