Mountville is a borough in Lancaster County, Pennsylvania, United States. The population was 2,444 at the 2000 census. The original Charles Chips potato chip factory was located here. According to the United States Census Bureau, the borough has a total area of 0.9 square miles (2.2 km²), all of it land. Mountville is served by the West Hempfield Township Police, has one volunteer fire department, and is in the Hempfield School District.