The Mifflinburg Area School District is a small, rural, public school district serving western Union County, Pennsylvania. Centered on the borough of Mifflinburg, it also serves Buffalo Township, New Berlin, Limestone Township, West Buffalo Township, Lewis Township, Hartleton, and Hartley Township. Mifflinburg Area School District encompasses approximately 217 square miles (560 km2). According to 2000 United States Census data, the district served a resident population of 17,867. By 2010, Mifflinburg Area School District's population declined to 16,366 people. The educational attainment levels for the Mifflinburg Area School District population were 81.5% high school graduates and 17.5% college graduates. The region has a large Amish community who do not attend school past 8th grade. Most Amish children attend private schools operated by the amish community, rather than the local public schools. The district is one of the 500 public school districts of Pennsylvania and one of four full or partial public school districts operating in Union County.