Malvern is a borough in Chester County, Pennsylvania, United States. The population was 3,059 at the 2000 census. The main road through the borough is King Street, although the borough is also bordered by Paoli Pike on the south, and is near US 30 on the north. The primary cross street is Warren Avenue. The areas north and west of the borough along US 30 are simultaneously known as Malvern and Frazer, and the Frazer post office shares the Malvern zip code. Just east of Malvern is the village of Paoli. Malvern also contains a train stop on the SEPTA R5 line.