The population of Upper Mount Bethel Township was 6,706 at the 2010 census.

Old Mount Bethel was one of the oldest settled areas in Northampton County.

Included in its jurisdiction was the Old Hunter Settlement, founded by the Ulster Scotts around 1730.

After the Walking Purchase of 1737 between the William Penn family and the Lenape Delaware Indian tribes was completed, Old Mount Bethel was established in Bucks County.

It is drained by the Delaware River, which forms its eastern boundary separating it from New Jersey.

Its villages include Centerville, Five Points, Hartzells Ferry, Johnsonville, Mount Bethel, North Bangor, and Slateford.

21.7% of all households were made up of individuals, and 8.9% had someone living alone who was 65 years of age or older.