The Dean Family Farm, listed since 1975 as a historic site on the National Register of Historic Places, has its origins with the immigration of Daniel Dean, a native of Tobermore, County Londonderry, Ireland, to Philadelphia, Pennsylvania, in 1784 when he was aged 18, according to Dean family histories. Daniel was a son of George Roger Dean, who fought in the Colonial line, and Mary Campbell who was reared with her sister by the Duke of Argyl at Inveraray Scotland, the clan Campbells' ancestral home.
