Route Number | Length | Western / Southern Terminus | Eastern / Northern Terminus | Counties |
---|
US 1 | 84 miles (135 km) | US 1 atDC border inMount Rainier | US 1 atPennsylvania border nearRising Sun | Prince George's,Howard,Baltimore County,Baltimore City,Harford,Cecil |
US 11 | 12.83 miles (20.65 km) | US 11 atWest Virginia border nearWilliamsport | US 11 atPennsylvania border nearMaugansville | Washington |
US 13 | 42.48 miles (68.36 km) | US 13 atVirginia border nearPocomoke City | US 13 atDelaware border inDelmar | Worcester,Somerset,Wicomico |
US 15 | 37.85 miles (60.91 km) | US 15 atVirginia border nearPoint of Rocks | US 15 atPennsylvania border nearEmmitsburg | Frederick |
US 29 | 25.91 miles (41.70 km) | US 29 atDC border nearSilver Spring | MD 99 inMount Hebron | Montgomery,Howard |
US 40 | 221.31 miles (356.16 km) | US 40 atPennsylvania border nearAddison, PA | US 40 atDelaware border nearGlasgow, DE | Garrett,Allegany,Washington,Frederick,Carroll,Howard,Baltimore County,Baltimore City,Harford,Cecil |
US 48 | Former Route | I-68 atWest Virginia state line nearFriendsville | I-70 nearHancock | Garrett,Allegany,Washington |
US 50 | 150.06 miles (241.50 km) | US 50 atDC border inCheverly[1] | MD 528 inOcean City | Garrett,Prince George's,Anne Arundel,Queen Anne's,Talbot,Dorchester,Wicomico,Worcester |
US 111 | Former Route | US 1 inBaltimore | U.S. Route 111 atPennsylvania border | Baltimore City,Baltimore County |
US 113 | 37.84 miles (60.90 km) | US 13 inPocomoke City | US 113 atDelaware state line | Worcester |
US 140 | Former Route | US 140 atPennsylvania state line | US 1 inBaltimore | Carroll,Baltimore County,Baltimore City |
US 213 | Former Route | US 50 inWye Mills | US 40 inElkton | Queen Anne's,Kent,Cecil |
US 219 | 48.40 miles (77.89 km) | US 219 atWest Virginia border nearRedhouse | US 219 atPennsylvania border nearGrantsville | Garrett |
US 220 | 27.35 miles (44.02 km) | US 220 atWest Virginia border nearMcCoole | US 220 atPennsylvania border nearCumberland | Allegany |
US 222 | 3.60 miles (5.79 km) |     
  US 1/MD 222/MD 222 Truck inConowingo, MD | US 222 atPennsylvania border | Cecil |
US 240 | Former Route | US 240 atDC border | US 40 inFrederick | Montgomery,Frederick |
US 301 | 123.30 miles (198.43 km) | US 301 atVirginia border atGovernor Harry W. Nice Memorial Bridge | US 301 atDelaware border inWarwick | Charles,Prince George's,Anne Arundel,Queen Anne's,Kent,Cecil |
US 340 | 16.99 miles (27.34 km) | US 340 atVirginia border nearWeverton | US 40 inFrederick | Washington,Frederick |
US 522 | 2.37 miles (3.81 km) | US 522 atWest Virginia border nearHancock |  I-70/US 522 atPennsylvania border nearHancock | Washington |
US 622 | Former Route | US 40 inHancock | US 622 nearHancock | Washington |