- Southern Terminus:
- Commerce Street in Havre de Grace
- Northern Terminus:
- Union Avenue (MD 7) and Revolution Street (MD 7) in Havre de Grace
- 0.31 miles
MD 490 is the designation for the short section of Union Avenue in Havre de Grace south of where MD 7 turns onto it from Revolution Street. Despite being not even half a mile in length, it is a signed route.