It was added to the National Register of Historic Places in 1976.

[1] The district includes one contributing site and three hundred and forty contributing buildings which are located in a nineteenth-century residential area of Harrisburg that contains the original core of the city.

[2] Notable buildings include the Y.M.C.A., which was built in 1932, the William Maclay Mansion, which was erected in 1792, Grace Methodist Church, which was built in 1871, St. Stephen's Episcopal Cathedral, which was erected in 1826, St. Michael's Lutheran Church, which was built in 1906, the Cathedral of Saint Patrick, which was erected in 1907, and the Unit Row Houses.

The John Harris Mansion is also located in the district, but was listed separately on the register.

[2] This district was added to the National Register of Historic Places in 1976.