On March 12, 1772, what was left of Albany County was split into three parts, one remaining under the name Albany County. Tryon County contained the western portion (and thus, since no western boundary was specified, theoretically still extended west to the Pacific). The eastern boundary of Tryon County was approximately five miles west of the present city of Schenectady in the Mohawk River Valley, and the county included the western part of the Adirondack Mountains and the area west of the West Branch of the Delaware River. Tryon County was later divided to organize 37 distinct counties of New York State. The county was named for William Tryon, colonial governor of New York.