Ellicott's Line

The meridian northward from the point of beginning of the first United States cadastral survey - a point established on August 20, 1785 on the north bank of the Ohio River - was named for Andrew Ellicott, and is known as Ellicott's Line. It is also the Ohio-Pennsylvania boundary line. - Andrew Ellicott was appointed by President George Washington to work with Spanish surveyors in running and marking the boundary between Mississippi Territory and Spanish Florida as determined by the treaty dated Oct. 27, 1795. This boundary along the 31st parallel of north latitude is called Ellicott's Line of Demarcation.