Rising Sun is a town in Cecil County, Maryland, United States. The population was 2,781 at the 2010 census. The town which became known as Rising Sun was located in the disputed “Nottingham Lots” along the border between colonial Pennsylvania and Maryland. This area was claimed by William Penn and settled by Quakers in 1702 over the obj…Rising Sun is a town in Cecil County, Maryland, United States. The population was 2,781 at the 2010 census. The town which became known as Rising Sun was located in the disputed “Nottingham Lots” along the border between colonial Pennsylvania and Maryland. This area was claimed by William Penn and settled by Quakers in 1702 over the objection of Maryland. When Charles Mason and Jeremiah Dixon conducted a survey of the order in the 1760s, Rising Sun was found to be located in Maryland.