Where is lancaster school district? The School District of Lancaster is a large, urban school district of 11,300 students educated in 19 schools in central Lancaster County, Pennsylvania.What is lancaster county code? Lancaster, PA is currently using two area codes which are area codes 717 and 223. In addition to Lancaster, PA area code information read more details about area code 717, area code 223 and Pennsylvania area codes. Lancaster, PA is located in Lancaster County and observes the Eastern Time Zone.What is lancaster district? Lancaster School District. The Lancaster School District is a school district that serves a major part of the city of Lancaster, California (USA). The Lancaster School District was first formed in 1885.