Where is messiah college in pennsylvania? Messiah College. Messiah College (CDP) is a census-designated place located in Upper Allen Township, Cumberland County, in the state of Pennsylvania. It is located near Grantham and consists of the campus of Messiah College.How many students attend messiah college? Messiah College currently has 3,331 undergraduate and graduate students. Each year, close to 700 students choose Messiah for their undergraduate studies. Many students apply to Messiah College just before starting their senior year of high school.What is the messiah college? Messiah College is a private Christian college of the liberal arts and applied arts and sciences located in Mechanicsburg, Pennsylvania.