MD 109

Maryland Route 109
Maryland Route 109 highlighted in red
Route information
Maintained by MDSHA
Length:	11.87 mi (19.10 km)
Existed:	1927 – present
Tourist routes:	Chesapeake and Ohio Canal Scenic Byway Antietam Campaign Scenic Byway
Major junctions
South end:	MD 107 in Poolesville
	MD 28 in Beallsville I-270 near Hyattstown
North end:	MD 355 in Hyattstown
Location
Counties:	Montgomery County
Highway system
Maryland highway system Interstate US State Scenic Byways ← MD 108 MD 112 →

MD 28 in Beallsville

Maryland Route 109 (MD 109) is a state highway in the U.S. state of Maryland. The highway runs 11.87 miles (19.10 km) from MD 107 in Poolesville north to MD 355 in Hyattstown. MD 109 connects the northwestern Montgomery County communities of Poolesville, Beallsville, Barnesville, and Hyattstown with each other and with Interstate 270 (I-270). The highway was built between Beallsville and Barnesville by 1910. MD 109 was extended to Poolesville in the early 1920s and to Comus in the late 1920s. The route was extended north through its early 1950s interchange with I-270 to Hyattstown in the late 1950s.

MD 109 begins at the intersection of Elgin Road and Fisher Avenue in the town of Poolesville. The intersection also serves as the western terminus of MD 107, which heads east along Fisher Avenue through the Poolesville Historic District. MD 109 heads north along two-lane Elgin Road, which becomes Beallsville Road when it leaves the town. The highway passes by the historic homes Chiswell's Inheritance and Dowden's Luck before passing through the village of Beallsville, where the route intersects MD 28 (Darnestown Road). MD 109 continues northeast and passes under CSX's Metropolitan Subdivision south of Barnesville; next to the railroad bridge is the Barnesville station on MARC's Brunswick Line. The highway continues through the town of Barnesville, where the route turns east onto Barnesville Road then north onto Old Hundred Road. MD 109 crosses a branch of the Little Monocacy River and intersects Comus Road in the hamlet of Comus; Comus Road leads west to Sugarloaf Mountain. The highway veers east at the Montgomery–Frederick county line, which the route briefly follows, and meets I-270 (Eisenhower Memorial Highway) at a partial cloverleaf interchange. MD 109 closely parallels Little Bennett Creek and crosses it within the interchange. The highway reaches its eastern terminus at MD 355 (Frederick Road) in the village of Hyattstown, a short distance south of MD 355's intersection with MD 75 (Green Valley Road) on the opposite side of the county line.