Upper Dublin is made up of several community areas, many of which are unincorporated areas in Montgomery County with no legal status, and are used primarily by the US Postal Service. These community areas are portions of Abington (19001), Ambler (19002) (excluding the Borough of Ambler), Ardsley (19038), Dresher (19025), Fort Washington (19034), Jarrettown (19025), Maple Glen (19002), North Hills (19038), Oreland (19075) and Willow Grove (19090).
Upper Dublin dates back to 1684, when Edward Tanner was granted land by William Penn in the Province of Pennsylvania and named it "Upper and Lower Dublin." Lower Dublin was incorporated into the City of Philadelphia following the passage of the Act of Consolidation in 1854. The "upper" portion has continued to exist around the original survey for the laying out and naming of Susquehanna Road. Upper Dublin Township was established in 1701, when William Penn ordered a survey of all townships in the Commonwealth. It was first settled in 1698, and incorporated in 1719. The township was granted its current status of First Class Township in the Commonwealth of Pennsylvania on January 1, 1946. Originally the area started as a farming community with additional activity in the mining of limestone. Limekiln Pike today continues to be an important travel artery.
American Revolutionary War
During the Philadelphia campaign of the American Revolutionary War, George Washington and the Continental Army were encamped here after their October 4, 1777 defeat at the Battle of Germantown, and immediately prior to their march to Valley Forge. From December 5–8, 1777, the Battle of White Marsh was fought here between British and American forces. Throughout the encampment, Washington was headquartered at the Emlen House, built by Quaker George Emlen in 1745. British commander General William Howe observed the American lines from the belltower of St. Thomas' Episcopal Church (at Bethlehem Pike and Camp Hill Road), site of the British encampment on December 5. Fort Washington State Park, in neighboring Whitemarsh Township, contains the area in which the primary American defenses were situated.