Mount Carmel is a borough in Northumberland County, located in the Coal Heritage Region of Central Pennsylvania's Susquehanna River Valley, United States. The population was 5,725 at the 2020 census. It is located 88 miles (141 km) northwest of Philadelphia and 71 miles (114 km) northeast of Harrisburg, in the Coal Region. It is completely encircled by Mount Carmel Township.

Northumberland County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 91,647. Its county seat is Sunbury. The county is part of the Central Pennsylvania region of the state.