- List of roads in Howard County, Maryland
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Road Route Places Landmarks Notes Baltimore National Pike Edmondson Avenue (in Baltimore) to Frederick Ellicott City
Brick House on the Pike "Baltimore National Pike" is the designation for US-40 throughout Howard County. West of Ellicott City, US-40 merges into I-70, and the two routes share a path until Frederick. This part of I-70 is also known as Baltimore National Pike. Bethany Lane Old Frederick Road to Baltimore National Pike Ellicott City Continues north of MD-99 as Old Mill Road and south of US-40 as Centennial Lane. Brighton Dam Road Ten Oaks Road to Market Street (in Montgomery County Clarksville Triadelphia Reservoir
Brookeville Woolen Mill and House
Broken Land Parkway The Mall in Columbia to Guilford Road Columbia
The Mall in Columbia
Exit 18 off US-29. Exit 14 off Maryland Route 32
Road Route Places Landmarks Notes Cedar Lane Harpers Farm Road to Guilford Road Harper's Choice
Howard County General Hospital Continues south of Guilford Road as Pindell School Road. A second road known as "Cedar Lane" also exists north of this one from Rivendell Lane to a dead end just north of MD-108. Centennial Lane Baltimore National Pike to Clarksville Pike Ellicott City Centennial High School
Continues north of Baltimore National Pike as Bethany Lane and south of Clarksville Road as Beaverbrook Road. Clarksville Pike US-29 interchange to Montgomery County line (at Patuxent River) Clarksville
Middle Patuxent Environmental Area
Rocky Gorge Reservoir
Exit 21 off US-29. MD-108 continues east of US-29 interchange as Old Annapolis Road, and in Montgomery County as "Ashton Road".
Road Route Places Landmarks Notes Dorsey Road Scarlet Oak Drive to dead end southeast of Race Road (in Anne Arundel County) Elkridge Dorsey MARC rail station Continues northwest as Meadowridge Road. There is another Dorsey Road in Anne Arundel County, most of which is designated MD-176.
Road Route Places Landmarks Notes Frederick Road Two discontinuous roads:
Lakeview Drive to Baltimore National Pike
Baltimore National Pike to Baltimore Street (in Baltimore)
Roberts Inn Known as Main Street in historic Ellicott City
Road Route Places Landmarks Notes Gorman Road Kindler Road to Washington Boulevard (in Prince George's County Governor Warfield Parkway Little Pauxent Parkway to Little Pauxent Parkway Columbia Town Center An entrance to The Mall in Columbia Continues south of Little Pauxent Parkway as Banneker Road. Named after former Maryland governor Edwin Warfield.
Road Route Places Landmarks Notes Hoods Mill Road Woodbine Road to Frederick Road Cooksville Exit 76 off I-70
Road Route Places Landmarks Notes Johns Hopkins Road Pindell School Road to Gorman Road Applied Physics Laboratory Exit 15 off US-29
Road Route Places Landmarks Notes Little Patuxent Parkway Waterloo Road to end at circle to itself Town Center The Mall in Columbia
Howard County General Hospital
Howard Community College
Merriweather Post Pavilion
Long Gate Parkway Montgomery Road to Meadowbrook Lane Ellicott City Exit 1A off MD-100, used to access MD-103 from US-29 northbound.
Road Route Places Landmarks Notes Main Street Name for Frederick Road in historic Ellicott City Ellicott City Ellicott City Station Marriottsville Road Frederick Road to Runnymead Road (in Baltimore County) Ellicott City
Waverley Exit 83 off I-70 Meadowridge Road Brightfield Road to Scarlet Oaks Drive Elkridge Exit 4 off MD-100. Continues northwest of Brightfield Road as Montgomery Road, and southeast of Scarlet Oaks Drive as Dorsey Road Montgomery Road Old Washington Road to Old Columbia Pike Ellicott City
Exit 23 off US-29
Road Route Places Landmarks Notes Oakland Mills Road Sohap Lane to Guilford Road Oakland Mills, Columbia, Maryland Christ Church Guilford Old Annapolis Road US-29 to Waterloo Road Columbia Exit 21 off US-29 Old Columbia Pike Frederick Road to Montgomery Road Ellicott City Formerly designated MD-987 Old Frederick Road Twin Arch Road to US-29 Mt. Airy
Continues east of US-29 as Rogers Avenue. Discontinuous at MD-97; requires a right and a left to continue.
Road Route Places Landmarks Notes Ridge Road Bond Street (in Carroll County to I-270 interchange (in Frederick County) Mt. Airy Exit 68 off I-70 Rogers Avenue Frederick Road to US-29 Ellicott City Continues west of US-29 as Old Frederick Road Roxbury Mills Road Frederick Road to Montgomery County line Brookeville
Patuxent River State Park
continues north of Frederick Road as Hoods Mill Road and south of Patuxent River as Georgia Avenue.
Road Route Places Landmarks Notes Scaggsville Road Clarksville Pike to Doves Fly Way Highland
Reservoir High School Exit 13 off US-29. West of US-29, designated as MD-216. East of US-29, splits off MD-216 and carries no numerical designation. MD-216 continues as a separate road to Laurel. On its north end, continues north of MD-108 as Highland Road with no numerical designation. Snowden River Parkway MD-100 to Broken Land Parkway (continues as Patuxent Woods Drive) Columbia
Exit 3 off MD-100 Sykesville Road I-70 interchange to Old Washington Road (in Carroll County West Friendship
Exit 80 off I-70. Continues north of Old Washington Road as Washington Road, and south of I-70 interchange known only as MD-32 with no name.
Road Route Places Landmarks Notes Washington Boulevard Dover Street (in Baltimore) to near Cherry Lane (in Prince George's County) Elkridge
Trinity Church Exit 3 off I-195, 6 off MD-100, and 12 off MD-32. Waterloo Road Montgomery Road to Little Patuxent Parkway Also is name for MD 175 from MD 108 junction to Oceano Avenue in Jessup, Maryland Ellicott City
Exit 2 off MD-100. Carries two designations on different parts of the route: MD-104 and MD-108. Whiskey Bottom Road Route 198 to Dead End North Laurel Edy's Ice Cream Plant Woodbine Road Liberty Road (in Carroll County to Annapolis Rock Road Woodbine
Patuxent River State Park Exit 73 off I-70. Woodstock Road Old Frederick Road to Baltimore County line (continues as Old Court Road) Woodstock
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