The Maryland highway system is a network of highways owned and maintained by the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

Maryland Maryland ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. It borders the states of Virginia to its south, West Virginia to its west, Pennsylvania to its north, and Delaware to its east ...

. In addition to the nationally numbered

Interstate Highways The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National H ...

and U.S. Highways, the highway system consists of a network of Maryland state-numbered highways. All three types of highways together provide access to all incorporated and unincorporated areas in all 23 counties of Maryland as well as the

independent city An independent city or independent town is a city or town that does not form part of another general-purpose local government entity (such as a province). Historical precursors In the Holy Roman Empire, and to a degree in its successor states ...

Baltimore Baltimore is the most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 census and estimated at 568,271 in 2024, it is the 30th-most populous U.S. city. The Baltimore metropolitan area is the 20th-large ...

Highway systems

Interstate highways

Maryland has 16 Interstate highways, including six primary Interstates and ten auxiliary Interstates. The longest Interstate in Maryland is

Interstate 95 Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the ...

, while the shortest Interstate is

I-295 Interstate 295 is the designation for the following eight Interstate Highways in the United States, all of which are related to I-95: *Interstate 295 (Delaware–Pennsylvania), a bypass of Philadelphia, Pennsylvania * Interstate 295 (Florida), a be ...

. Maryland also contains an unsigned Interstate, I-595; a former Interstate, I-170; and an intracounty Interstate, I-97, which is also the shortest primary highway in the Interstate Highway System.

U.S. highways

Maryland has 14 U.S. Highways, including seven primary U.S. Highways and seven auxiliary U.S. highways. The longest U.S. highway in Maryland is U.S. Route 40, while the shortest U.S. highway is US 522. Maryland also contains six former U.S. highways.

Maryland state highways

Maryland has a unitary system of numbered state highways with numbers between 2 and 999. The longest Maryland state highway is

Maryland Route 2 Maryland Route 2 (MD 2) is the longest state highway in the U.S. state of Maryland. The route runs from Solomons, Maryland, Solomons Island in Calvert County, Maryland, Calvert County north to an intersection with U.S. Route 1 in Maryland, U ...

, while several state highways are less than in length. Most of the shortest highways are unsigned. Several state highways have multiple disjoint segments that are denoted internally by suffixes, encompassing either old alignments of a major highway or a collection of service roads related to a particular highway.

Other systems

There are other systems of highways in Maryland that are not marked but are numbered internally. * County highways: All 23 counties have internal numerical designations for all highways under their jurisdiction. * Municipal highways: Every city, town, and village maintains an internal system of numerically designated municipal streets. * Federal government or agency highways: Highways maintained by the federal government or agencies such as the

Maryland-National Capital Park and Planning Commission The Maryland-National Capital Park and Planning Commission (M-NCPPC) is a bi-county agency that administers parks and planning in Montgomery and Prince George's counties in Maryland. History The commission was formed in 1927 by the Maryland G ...

are designated inventory numbers. Examples of highways within this category include

parkway A parkway is a landscaped thoroughfare. The term is particularly used for a roadway in a park or connecting to a park from which trucks and other heavy vehicles are excluded. Over the years, many different types of roads have been labeled p ...

s, such as the

Clara Barton Parkway The Clara Barton Parkway is a parkway in the U.S. state of Maryland and Washington, D.C. The highway runs from MacArthur Boulevard in Carderock, Maryland, east to Canal Road at the Chain Bridge in Washington. The Clara Barton Parkway is a ...

or Sligo Creek Parkway; streets on federal research campuses, such as those of the

National Institutes of Health The National Institutes of Health (NIH) is the primary agency of the United States government responsible for biomedical and public health research. It was founded in 1887 and is part of the United States Department of Health and Human Service ...

Goddard Space Flight Center The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory located approximately northeast of Washington, D.C., in Greenbelt, Maryland, United States. Established on May 1, 1959, as NASA's first space flight center, GSFC ...

; roads on military bases, such as those on

Fort Meade Fort George G. Meade is a United States Army installation located in Maryland, that includes the Defense Information School, the Defense Media Activity, the United States military bands#Army Field Band, United States Army Field Band, and the head ...

; and roads within reservations of the

National Park Service The National Park Service (NPS) is an List of federal agencies in the United States, agency of the Federal government of the United States, United States federal government, within the US Department of the Interior. The service manages all List ...

, such as Bayberry Drive within

Assateague Island National Seashore Assateague Island National Seashore is a unit of the National Park Service system of the U.S. Department of the Interior. Located on the East Coast along the Atlantic Ocean in Maryland and Virginia, Assateague Island is the largest natural bar ...

. * State reservation highways: Highways maintained by non-highways agencies of the state of Maryland. Examples of highways within this categories include streets on state university campuses, access roads to state parks and state forests, and highways within state-owned airports.

Highway agencies

Maryland State Highway Administration

The vast majority of Interstate, U.S., and state highways are constructed by and maintained by the Maryland State Highway Administration (MDSHA).

Maryland Transportation Authority

All toll facilities in the state and limited access highways within Baltimore except I-83 are constructed and maintained by the Maryland Transportation Authority (MdTA).

Other agencies

All U.S. and state highways and I-83 within Baltimore are maintained by the

Baltimore City Department of Transportation Baltimore is the List of municipalities in Maryland, most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 United States census, 2020 census and estimated at 568,271 in 2024, it is the List of United States ...

. Portions of U.S. and state highways within particular cities and towns are maintained by the respective municipalities.

Gallery

File:2016-09-21 17 08 38 View east along Maryland State Route 80 (Fingerboard Road) between Maryland State Route 75 (Green Valley Road) and Chaucer Court in Fountain Mills, Frederick County, Maryland.jpg, Maryland Route 80 File:2016-07-20 15 10 27 View east along Maryland State Route 231 (Hallowing Point Road) at J W Williams Road in Barstow, Calvert County, Maryland.jpg, Maryland Route 231 File:2017-08-28 09 35 38 View south along U.S. Route 113 (Worcester Highway) at Maryland State Route 756 (Old Snow Hill Road) just northeast of Pocomoke City in Worcester County, Maryland.jpg,

U.S. Route 113 U.S. Route 113 (US 113) is a U.S. Highway that is a spur of US 13 in the U.S. states of Maryland and Delaware. The route runs from US 13 in Pocomoke City, Maryland, north to Delaware Route 1 (DE 1) in ...

File:Casselman River Maryland.jpg, U.S. Route 40 Alternate (Keysers Ridge–Cumberland, Maryland) File:2016-09-16 13 55 45 View north along Interstate 95 just north of Exit 35 (Maryland State Route 216, Laurel, Scaggsville) in North Laurel, Howard County, Maryland.jpg,