|Maryland Route 550|
|Pen Mar Rd, Macfee Hill Rd, Military Rd, Fort Ritchie Rd, Sabillasville Rd, Church St, Jimtown Rd, Creagerstown Rd, Woodsboro-Creagerstown Rd, Woodsboro Rd
Maintained by MDSHA
|Length:||24.43 mi (39.32 km)|
|South end:||MD 26 in Libertytown|
|U.S. 15 in Thurmont|
|North end:||End of state maintenance in Pen Mar|
Maryland Route 550 is an north–south two-lane undivided highway in western central Maryland.
From the south, MD 550 begins at MD 26 in Libertytown. The route terminates at the end of state maintenance south of the Pennsylvania state line. It is a two-lane undivided arterial route for its entire length.
Maryland Route 550 runs from Libertytown, Frederick County north to Pen Mar, Washington County, Maryland. It travels through a number of communities, including Thurmont, where it intersects U.S. 15. Originally, the route ended there. In 1977, the 550 designation was applied to the routing of MD 81, which was then decommissioned. This was done to provide a continuous route number and to minimize the confusion with Interstate 81, which also runs through Washington County.
|Frederick||Libertytown||0.00||MD 26 (Liberty Road)||Southern terminus|
|Woodsboro||5.01||MD 194 south (Woodsboro Pike)||South end of MD 194 concurrency|
|5.56||MD 194 north (Woodsboro Pike)||North end of MD 194 concurrency|
|Thurmont||12.92||MD 77 east (Rocky Ridge Road)||South end of MD 77 concurrency|
|13.91||MD 77 west (Main Street) / MD 806 south (Water Street)||North end of MD 77 concurrency|
|Washington||Fort Ritchie||23.84||MD 491 south (Raven Rock Road)||Northern terminus of MD 491|
|Pennsylvania state line||24.43||Pen Mar Road||Northern terminus, continues as Pen Mar Road|