Maryland Route 451
| List of former Maryland state highways (400–499) | |
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| Highway names | |
| Interstates: | Interstate X (I-X) |
| US Highways: | U.S. Route X (US X) |
| State: | Maryland Route X (MD X) |
| List of former Maryland state highways | |
| System links | |
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| Location: | Garrison |
| Existed: | 1930–1991 |
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| Location: | Butler |
| Existed: | 1932–1987 |
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| Location: | Hyattsville–Riverdale |
| Existed: | 1942–1956 |
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| Location: | Hudson Corner–West Pocomoke |
| Existed: | 1930–1961 |
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| Location: | Edgewood |
| Existed: | 1930–1952 |
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| Location: | Freeland–Maryland Line |
| Existed: | 1930–1991 |
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| Location: | Mount Rainier–Hyattsville |
| Existed: | 1930–c. 1946 |
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| Location: | Riverdale |
| Existed: | 1930–1991 |
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| Location: | Scotland |
| Existed: | 1930–1956 |
The Maryland highway system has several hundred former state highways. These highways were constructed, maintained, or funded by the Maryland State Roads Commission or Maryland State Highway Administration and assigned a unique or temporally unique number. Some time after the highway was assigned, the highway was transferred to county or municipal maintenance and the number designation was removed from the particular stretch of road. In some cases, a highway was renumbered in whole or in part. This list contains all or most of the state-numbered highways between 400 and 499 that have existed since highways were first numbered in 1927 but are no longer part of the state highway system or are state highways of a different number. Most former state highways have not had their numbers reused. However, many state highway numbers were used for a former highway and are currently in use. Some numbers have been used three times. The former highways below whose numbers are used presently, those that were taken over in whole or in part by another highway, or have enough information to warrant a separate article contain links to those separate highway articles. Highway numbers that have two or more former uses are differentiated below by year ranges. This list does not include former Interstate or U.S. Highways, which are linked from their respective lists.
Maryland Route 400 was the designation for Mount Wilson Lane, which ran from MD 140 west to the Western Maryland Railway (now CSX's Hanover Subdivision) and the former Mount Wilson Hospital Center near Garrison in western Baltimore County. The highway was paved as a concrete road in 1930. MD 400 was removed from the state highway system in 1991.
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