Donegal is a borough in Westmoreland County, Pennsylvania, United States.

[3] Donegal is best known as an exit on the Pennsylvania Turnpike with restaurants, gas stations, and two hotels for travelers.

[5] According to the United States Census Bureau, the borough has a total area of 0.3 square miles (0.78 km2), all land.

Donegal Township is home to a busy turnpike exchange that sees thousands of people every year.

There are also several Frank Lloyd Wright-designed homes within driving distance that can be toured, such as The Duncan House, Kentuck Knob, and Fallingwater.

Fallingwater is located near Ohiopyle State Park, which offers a range of opportunities for outdoor recreation.