Mount Jewett is a borough in McKean County, Pennsylvania, United States.

[4] According to the United States Census Bureau, the borough has a total area of 2.4 square miles (6.2 km2), all land.

Mount Jewett is tied with Callimont for the title of being the fifth-highest, in elevation, of towns in Pennsylvania, at 2240 feet.

The racial makeup of the borough was 99.53% White, 0.28% Native American, 0.09% Asian, and 0.09% from two or more races.

27.7% of all households were made up of individuals, and 12.6% had someone living alone who was 65 years of age or older.