Grantham is an unincorporated community in Upper Allen Township, Cumberland County in the U.S. state of Pennsylvania, best known today for the Christian liberal arts college, Messiah College, whose students make up most of its population. There is no industry, no mass-commercialization, and very little night life outside of the College. The population of Grantham is 85-90% between the ages of 18 and 25 years old - if you only count the student population. The actual residents number between 600-650, a large number of which are Messiah alumni, employees or parents of the same. Founded in the early twentieth century, it was built around the rapidly growing industry built along the nearby railway line, which supplied the labor and logistical support to the macaroni factory run by Messiah College's first president S.R. Smith. After the macaroni plant went out of business, the facility was used for aircraft parts and a greeting card business. It was destroyed by fire prior to 1957 and stood derelict for many years; eventually it was demolished to provide a new maintenance facility for the growing college. Most of the oldest homes in "downtown" Grantham were built around 1915-17 to house workers for the factory. Currently some of these older homes are used as rentals for College students and others, while others remain private homes. The original Grantham National Bank building (which printed its own currency before the advent of the Fed) still stands on Mill Road, its kitchen retains the original vault! The other early business was the mill, a large stone building built in 1775, located on a chase that feeds from the Yellow Breeches creek. It was the closest place for farmers to bring their grain for milling. The mill is currently a private residence; the home of the original miller (The Griswold Residence) is being renovated as a private residence after being used by Messiah College students from about 2003 to 2007. As of 2007, the rest of the Griswold farm (7 acres) was being developed into a small subdivision of single family homes.