- Western Terminus:
- Churchville Road (MD 22) in Churchville
- Eastern Terminus:
- Pulaski Highway (US 40) and Otsego Street (MD 7) in Havre de Grace
- 9.06 miles
MD 155 is an east/west route from Churchville to Havre de Grace. For most of its length, it is known as Level Road. It begins at the point where Churchville Road (MD 22) curves to the southeast and runs east to the last interchange on the John F. Kennedy Memorial Highway (I-95) before it crosses the Susquehanna River. Level Road continues southeast to Havre de Grace. There, it changes names at a railroad underpass to become Superior Street. Immediately, MD 155 splits off onto Ohio Street, which Superior Street continues for a few blocks as MD 763. Ohio Street runs south for a few blocks to end at Pulaski Highway (US 40) across from Otsego Street (MD 7).