Ummeli v Rockville ube nesilinganiso esimaphakathi — 4.9 (ngokwezilinganiso zomsebenzisi Mapich).
Sithole ummeli Rockville emigwaqweni elandelayo: S Washington St, Maryland Ave, Church St, N Washington St, Monroe St
Le datha ikhiqizwa kusetshenziswa izihlungi zangokwezifiso ezisuselwe kukho 7 Izinkampani, eyethulwe kuleli khasi.