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 500 and 599 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.

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MD 502

Maryland Route 502 was the designation for Greenbackville Road, which ran from the Virginia state line at Greenbackville north to MD 366 near Stockton in southeastern Worcester County. The state highway was assigned by 1946. MD 502 was removed from the state highway system in 1960.

MD 503

Maryland Route 503 was the designation for Olivet Road from the community of Olivet at the confluence of Mill Creek and St. John Creek north to MD 2 (now MD 765) near Lusby in southern Calvert County. The highway was constructed as a gravel road in 1933. MD 503 was removed from the state highway system in 1957. Part of the course of MD 503 was returned to the state highway system in 1963 and is now part of MD 760.

MD 504

Maryland Route 504 was the designation for Dowell Road from near the confluence of Back Creek and St. John Creek north to MD 2 (now MD 765) near Solomons in southern Calvert County. The highway was constructed as a gravel road in 1933. MD 504 was resurfaced in 1944 due to being the access road to a U.S. Navy amphibious base. The highway was removed from the state highway system in 1957.

MD 505

Maryland Route 505 was the designation for Coster Road from near the confluence of Hellen Creek and the Patuxent River east to MD 2 (now MD 765) near Lusby in southern Calvert County. The highway was constructed as a gravel road in 1933. MD 505 was removed from the state highway system in 1957.

MD 507

Maryland Route 507 was the designation for Stoakley Road from the intersection of Barstow Road and Leitches Wharf Road east to MD 2 near Prince Frederick in central Calvert County. The highway was constructed as a gravel road in 1933. MD 507 was removed from the state highway system in 1957.

MD 510

Maryland Route 510 was the designation for Huntingtown Road from Mill Branch Road north to MD 262 near Sunderland in northern Calvert County. The highway was constructed as a gravel road in 1933. MD 510 was removed from the state highway system in 1957.

MD 511

Maryland Route 511 was the designation for Parkers Wharf Road from near the Patuxent River north to MD 264 near Mutual in southern Calvert County. The highway was constructed as a gravel road in 1933. MD 511 was removed from the state highway system in 1957.

MD 512

Maryland Route 512 was the designation for Williams Wharf Road from near the Patuxent River east to MD 264 near Mutual in southern Calvert County. The highway was constructed as a gravel road in 1933. MD 512 was removed from the state highway system in 1957.

MD 513

Maryland Route 513 was the designation for Piney Branch Road from the Washington, D.C., boundary in Takoma Park north to MD 320 in Silver Spring in southeastern Montgomery County. The highway, which was also named Saratoga Avenue in Takoma Park, was constructed in 1931 and 1932. MD 513 was replaced by a southern extension of MD 320 in 1955; MD 320 was removed from its original course along Sligo Avenue, which became MD 339.

MD 515

Maryland Route 515 was the designation for Second Avenue from MD 384 north to MD 391 within Silver Spring in southeastern Montgomery County. The highway was completed as a macadam road in 1933 and 1934. MD 515 was removed from the state highway system in 1960.

MD 516

Maryland Route 516 was the designation for Franklin Avenue from US 29 east to MD 193 within Silver Spring in southeastern Montgomery County. The highway was constructed as a macadam road between 1931 and 1933. MD 516, which had a length of , was transferred to county maintenance in 1999 as part of the highway swap to designate the Great Seneca Highway as MD 119.

MD 517

Maryland Route 517 was the designation for Harkins Road from MD 23 in Norrisville east to MD 24 near Pylesville in northern Harford County. The highway was constructed as a concrete road from MD 24 west to the hamlet of Harkins at Fawn Grove Road in 1933. MD 517 was extended west as a macadam road from Harkins to the hamlet of Carea at Carea Road in 1934 and 1935. The highway was completed to Norrisville in 1936. MD 517 was replaced by a westward extension of MD 136 in 1956.

MD 519

Maryland Route 519 was the designation for the portion of Greenspring Avenue from Worthington Road east to Dover Road east of Reisterstown in central Baltimore County. The highway was paved from Worthington Road to Baublitz Road by 1933 and extended to Dover Road in 1935. MD 519 was removed from the state highway system in 1979.

MD 523

Maryland Route 523 was the designation for Chaneyville Road from a point near the Patuxent River east to MD 416 (now MD 4) at Chaneyville in northern Calvert County. The highway was constructed as a gravel road in 1932. MD 523 was removed from the state highway system in 1957.

MD 524

Maryland Route 524 was the designation for Grovers Turn Road from Mount Harmony Road—which until 1955 had been part of MD 260—east to MD 2 (now MD 778) near Owings in northern Calvert County. The highway was constructed as a gravel road in 1932. MD 524 was removed from the state highway system in 1957.

MD 525

Maryland Route 525 was the designation for Ferry Landing Road from a point near the Patuxent River east to MD 416 (now MD 4) at Dunkirk in northern Calvert County. The highway was constructed as a gravel road in 1932. MD 525 was removed from the state highway system in 1957.

MD 526

Maryland Route 526 was the designation for Pennsylvania Avenue from Main Street (then MD 32) north to MD 97 and MD 140 within Westminster in central Carroll County. The highway was originally part of US 140 (now MD 97 north of MD 140). MD 526 was assigned to Pennsylvania Avenue after US 140 was moved to the Westminster Bypass when it opened in 1954. The highway was removed from the state highway system between 1985 and 1999.

MD 530

Maryland Route 530 was the designation for the section of Cross Street between High Street and US 213 in Chestertown in central Kent County. These two blocks of Cross Street were brought into the state highway system by 1939. MD 530 was transferred from state to municipal maintenance after the street was paved in bituminous concrete by the terms of a March 2, 1960, road transfer agreement. Cross Street re-entered the state highway system through an August 28, 1985, road transfer agreement and is now part of MD 289.

References

MD 531 (1933–1946)

Maryland Route 531 was the designation for Waterloo Road from US 1 in Jessup north to MD 103 near Ellicott City in eastern Howard County. The highway was constructed as a macadam road in 1932. MD 531 was replaced by an extension of MD 175 northwest from Jessup by 1946. The highway's path is now followed mostly by MD 108 and MD 104, which replaced MD 175 north from modern MD 175 around 1977.

MD 531 (1946–1959)

Maryland Route 531 was the designation for Galestown–Reliance Road, which ran from Galestown Newhart Mill Road in Galestown north to MD 392 at Reliance in northeastern Dorchester County. For much of its course south from Reliance, the highway followed the Maryland–Delaware state line. MD 531 was established by 1946. The highway was removed from the state highway system in 1959.

MD 532

Maryland Route 532 was the designation for a pair of highways, one each in southwestern Carroll County and northwestern Howard County. The Carroll County portion of the highway followed West Watersville Road from MD 27 (now MD 808) in Mount Airy east to Watersville Road in southwestern Carroll County. The Howard County portion of MD 532 followed East Watersville Road from a point north of US 40 near Lisbon north part of the way to the Patapsco River in western Howard County. The first portion of the Carroll County segment was built as a concrete road east from Mount Airy in 1933. MD 532 was completed as a macadam road east to Watersville Road in 1935. The Howard County segment was built in 1934 and 1935. Both counties' segments of MD 532 were removed from the state highway system in 1956.

MD 533

Maryland Route 533 was the designation for Cobb Island Road from Cobb Island north to MD 3 (now MD 257) near Rock Point in southern Charles County. The highway was constructed in 1932. MD 533 was renumbered MD 254 in 1958.

MD 534

Maryland Route 534 was the designation for Forestville Road and Ritchie Road from MD 4 (now Marlboro Pike) in Forestville north to MD 221 near Largo in central Prince George's County. The highway was constructed as a gravel road along with Ritchie Road north of Ritchie–Marlboro Road north to MD 214 in 1923. Ritchie–Marlboro Road east from Ritchie Road to Upper Marlboro was completed in 1933. By 1939, the southern portion of Ritchie Road and Forestville Road to the south were designated MD 534. MD 534 and MD 221 were removed from the state highway system in 1955.

MD 536

Maryland Route 536 was the designation for Blossom Point Road, which ran from MD 6 south to a point south of Mill Swamp Road near Welcome in western Charles County. The highway was constructed as a gravel road in 1933. MD 536 was removed from the state highway system in 1956.

MD 537

Maryland Route 537 was the designation for Daves Hill Road, which ran between intersections with MD 213 on either side of Woodland Creek west of Galena in northeastern Kent County. The highway was part of the original Chestertown–Galena state road and was constructed as a macadam road in 1913. The state road became part of US 213 in 1927 and was widened to by 1934. MD 537 was assigned to Daves Hill Road after US 213 was reconstructed and relocated west of Galena in 1950 and 1951. The highway was transferred from state to county maintenance through a December 1, 1987, road transfer agreement.

References

MD 539

Maryland Route 539 was the designation for Old Annapolis Road from US 29 in the then-hamlet of Columbia at the modern junction of US 29 and MD 108 east to MD 175 at the hamlet of Jonestown at what is now the junction of MD 108 and MD 104 in eastern Howard County. The existing county highway was brought into the state system in 1956. MD 539 was replaced by an eastward extension of MD 108 in 1960 when MD 108 was extended east along what had been US 29 from Ashton to Columbia.

MD 541

Maryland Route 541 was the designation for Tyaskin Road from MD 349 north to Tyaskin in western Wicomico County. The highway was built as a macadam road in 1933. MD 541 was removed from the state highway system in 1956.

MD 548