Mifflin County is a county located in the U.S. state of Pennsylvania. The county seat is Lewistown. The county was created on September 19, 1789, from part of Northumberland County.

Mifflin County is part of the State College, PA Metropolitan Statistical Area.

Mifflin County is governed by a three-member Board of Commissioners, who are elected every four years.

Mifflin County is served by the Mifflin County School District, which includes five elementary schools, two middle schools, and one high school. The county is also home to several private schools, including Juniata Mennonite School, Lewistown Christian School, and Sacred Heart School.

Mifflin County is served by the Lewistown-Mifflin County Airport, which is located in Granville Township. The county is also served by the Mifflin County Transit Authority, which provides public transportation throughout the county.

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