Homes in Delta attract Maryland commuters as well as Pennsylvania residents. Delta is a borough in one of the southernmost parts of York County. Delta is in the South Eastern School District, and students attend Delta-Peachbottom Elementary in Delta. Delta was once known for its slate quarries, as it sits in the heart of the Peach Bottom Slate region. Most of Delta’s older homes still have slate roofs, and much of the town has blue-black slate sidewalks. Delta Historic District is registered on the National Register of Historic Places. The Peach Bottom Atomic Power Station is also located in Delta, on the west bank of the Susquehanna River.