Glencoe, also known as Coe Mansion, is located in Newark, Essex County, New Jersey, United States. The building was built in 1871 and was added to the National Register of Historic Places on October 1, 1991. See also National Register of Historic Places listings in Essex County, New Jersey References Houses on the National Register of Historic Places in New Jersey Italianate architecture in New Jersey Houses completed in 1871 Houses in Essex County, New Jersey Buildings and structures in Newark, New Jersey National Register of Historic Places in Newark, New Jersey New Jersey Register of Historic Places