Jamison is a community in Warwick Township, Bucks County. The Township has a population of approximately 14,500, and its total area is 11.1 square miles. Warwick was founded in 1733 and is named for a town in central England. Warwick is home to 2 locations on the National Register of Historic Places, the Bridge Valley Bridge and Moland House - Moland House was General George Washington's headquarters from August 10, 1777 until August 23, 1777 while troops were on their way to the Battle of Brandywine.