The following is a list of state highways in Maryland shorter than one mile (1.6 km) in length with route numbers between 800 and 899. Most of these highways act as service roads, old alignments of more prominent highways, or connectors between one or more highways. Many of these highways are unsigned and have multiple segments with the same number. Several of these highways have their own articles; those highways are summarized here and a link is provided to the main article. This list does not include highways where at least one highway of that number is at least one mile in length. All highways at least one mile in length have their own article. The highways shorter than one mile with the same number are covered in the main article for the highway.

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MD 804

Maryland Route 804 (officially MD 804B) is the unsigned designation for a section of old alignment of MD 64 through Chewsville. The state highway follows Track Side Drive from the western junction with MD 64 to MD 62 and Twin Springs Drive from MD 62 to the eastern intersection with MD 64.

MD 805

Maryland Route 805 (officially MD 805B) is the unsigned designation for an unnamed section of old alignment of MD 60 from a dead end north to Rocky Forge Road on the northbound side of MD 60 just south of the Pennsylvania state line near Leitersburg.

MD 810

Maryland Route 810 is a collection of 11 unsigned highways that are sections of old alignments of and service roads related to the present and old alignments of MD 210 (Indian Head Highway) in Accokeek in southwestern Prince George's County. The segments of MD 810 are designated in roughly alphabetical order from south to north with MD 810A near the Charles County line and MD 810K at the intersection of MD 210 and MD 373.

MD 810A is the designation for a stretch of Livingston Road a short distance east of the Charles County line. The state highway intersects Independence Road on a tangent, meets Beech Lane (MD 210K) at a perpendicular intersection, crosses MD 210, and intersects MD 210J immediately before its northern terminus. MD 810B is the designation for a section of Spring Grove Drive heading east from Beech Lane on the northbound side of MD 210. MD 810C is the designation for a section of Dale Lane heading east from Beech Lane on the northbound side of MD 210. MD 810D is the designation for a section of Maple Lane heading east from Beech Lane on the northbound side of MD 210. MD 810E is the designation for a stretch of Pine Drive. The state highway begins at Beech Lane, crosses MD 210, and intersects Beretta Drive (MD 210L) immediately before its northern terminus. MD 810F is the designation for a segment of Holly Way between Holly Road (MD 210M) and Pine Lane (MD 810G) on the southbound side of MD 210. MD 810G is the designation for a section of Pine Lane between MD 210 and Holly Way (MD 810F) on the southbound side of MD 210. MD 810H is the designation for a stretch of Manning Road that begins at the southbound direction of MD 210 and intersects MD 210N before reaching the northern terminus. MD 810I is the designation for a segment of Manning Road that begins at the northbound direction of MD 210 and heads east to its eastern terminus just beyond MD 228 (Berry Road), where Manning Road continues as a county highway. The two segments of Manning Road terminate at the same point on MD 210 but there is no access across MD 210's median. MD 810J is the designation for a section of Livingston Road that runs from Biddle Road (MD 210S) east to the intersection of MD 210 and MD 373 (Livingston Road). MD 810K is the designation for a stretch of Bryan Point Road that runs from a dead end adjacent to the MD 210–MD 373 intersection to Biddle Road (MD 210S).

MD 813

Maryland Route 813F is the unsigned designation for Twiford Road which runs from a short distance south of MD 313 north to State Street near Sharptown, Wicomico County, crossing MD 313. The route is long.

MD 815

Maryland Route 815 is the designation for Old Quantico Road, the old alignment of MD 349 (Nanticoke Road) just west of Salisbury. The state highway runs between two intersections with MD 349.

MD 817

Maryland Route 817 is the designation for two sections of old alignment of MD 331 and MD 16 in the southwestern corner of Caroline County. MD 817A is the designation for Linchester Road, which runs from MD 331 / MD 16 (Preston Road) at Linchester north to MD 331 / MD 16 (Main Street) in the town of Preston. MD 817A passes by the Linchester Mill. MD 817B is the unsigned designation for Langrell Road, which runs from MD 318 (Preston Road) at the Dorchester County line north to a dead end adjacent to the southern terminus of MD 817A.

MD 819

Maryland Route 819 is the designation for Reids Grove Road, a loop off Maryland Route 331 in Reids Grove, Dorchester County. The route is long.

MD 820

Maryland Route 820 is the unsigned designation for the westernmost end of Castle Hall Road. The state-maintained portion runs from Maryland Route 313 to a dead end in Caroline County. Near the middle, the county-maintained portion of Castle Hall Road intersects the route. The state-maintained portion is long.

MD 821

Maryland Route 821 is the unsigned designation for Main Street, a highway that passes through the town of Marydel, intersecting MD 311 (Halltown Road) and connecting with MD 454 (Crown Stone Road/Halltown Road) at both ends.

MD 822

Maryland Route 822 is the designation for UMES Boulevard, a connector between US 13 and College Backbone Road on the campus of the University of Maryland Eastern Shore. MD 822 heads east from US 13 as a two-lane divided highway, reaching a roundabout with MD 675. Past this point, the route passes student apartment complexes and curves southeast, becoming undivided and crossing the Delmarva Central Railroad's Delmarva Subdivision railroad line at-grade. The road runs through a wooded area and crosses Loretta Branch prior to becoming a divided highway again and heading onto the university campus. Here, MD 822 passes to the west of athletic fields before coming to its terminus at College Backbone Road. MD 822 was constructed as a new access road to the University of Maryland Eastern Shore campus and opened to traffic in 2001. In 2010, plans were made to construct a roundabout at the intersection of MD 675 and MD 822 in Princess Anne. The roundabout was completed in 2015.

MD 825

Maryland Route 825 is the designation for a pair of unsigned highways in Garrett County. MD 825B is the designation for Oakland Drive and G Street, the old alignment of MD 135 through Mountain Lake Park. MD 825C is the designation for an unnamed road that parallels MD 135 between two dead ends on the other side of a salt dome a short distance east of MD 135's intersection with MD 38 on top of Backbone Mountain. The highway is connected to MD 135 by MD 135C.

MD 826

Maryland Route 826 is a collection of 14 unsigned highways that are or were service roads constructed or old alignments maintained to provide access to private property or county highways whose access was compromised by the reconstruction of US 219 in Garrett County in the 1950s. Several instances of MD 826 connect with auxiliary routes of US 219. MD 826A through MD 826D and MD 826R are found near Oakland. MD 826E, MD 826G, MD 826H, and MD 826J through MD 826N are located between Accident and Keyser's Ridge. MD 826P was established between Hoyes and Accident.

MD 826A is the designation for SHA Drive and Weber Road, which together comprise of the old alignment of US 219 between CSX's Mountain Subdivision and an old alignment of MD 135, MD 825B (Oakland Drive). The state highway intersects both MD 135 (Maryland Highway) and US 219A (Weber Road), which connects MD 826A with US 219. MD 826A provides access to the Oakland Shop of the Maryland State Highway Administration at its southern end. MD 826B is the designation for Lumber City Road, a service road that provides access to industrial facilities west of US 219 just north of the CSX rail line in Oakland. MD 826B connects to US 219 at the same intersection as US 219A (Weber Road). MD 826C is the designation for an unnamed service road that comprises of the old alignment of US 219 between Gortner and Oakland, paralleling the southbound side of US 219 between two dead ends north of Monte Vista Road. MD 826D is the designation for an unnamed service road that comprises of the old alignment of US 219 between Gortner and Oakland, paralleling the southbound side of US 219 between two dead ends south of Monte Vista Road. MD 826E is the designation for Accident Garage Road, which comprises of the old alignment of US 219 between Accident and Keyser's Ridge, paralleling the northbound side of the federal highway heading west from US 219. MD 826E is located just south of Northern Garrett High School and serves the namesake business. MD 826G is the designation for an unnamed service road that comprises of the old alignment of US 219 between Accident and Bear Creek, paralleling the southbound side of US 219 between two dead ends. MD 826G is connected to US 219 by US 219C. MD 826H is the designation for an unnamed service road that runs from US 40 (National Pike) southeast to a dead end at Exit 14 of Interstate 68 in Keyser's Ridge. MD 826H provides access to the Keyser's Ridge Shop of the Maryland State Highway Administration. MD 826J is the designation for Stockyard Road, which comprises of the old alignment of US 219 at Keyser's Ridge paralleling the southbound side of the federal highway. The state highway runs between two dead ends; access to US 219 is provided at the south end and north end by US 219D and US 219E, respectively. MD 826K is the designation for an unnamed service road that comprises of the old alignment of US 219 south of Keyser's Ridge, paralleling the northbound side of the federal highway between two dead ends. MD 826K is connected to US 219 by US 219F. MD 826L is the designation for Ryland Court, which comprises of the old alignment of US 219 south of Keyser's Ridge, paralleling the southbound side of the federal highway between two dead ends. MD 826L is connected to US 219 by US 219G. MD 826M was the designation for Rabbit Hollow Road, which comprised of the old alignment of US 219 south of Keyser's Ridge, paralleling the northbound side of the federal highway heading east from US 219 to the county-maintained portion of Rabbit Hollow Road. MD 826M was removed from the state highway system in 2015 and transferred to county maintenance. MD 826N is the designation for an unnamed service road that comprises of the old alignment of US 219 south of Keyser's Ridge, paralleling the northbound side of the federal highway between two dead ends. MD 826N is connected to US 219 by county-maintained Collier Road just north of Northern Garrett High School. MD 826P is the designation for an unnamed service road that comprises of the old alignment of US 219 south of Accident, looping between two intersections with the federal highway on the northbound side. MD 826R is the designation for an unnamed road that runs from US 219 north to a gate at a SHA facility south of Oakland. The route was designated in 2014.

MD 827

Maryland Route 827 is the unsigned designation for two short sections of old alignment of MD 39 in western Garrett County. MD 827A has a length of and is located just east of Tannery Road in Hutton. MD 827C has a length of and is located just west of Stemple Road in Crellin. The road is connected to MD 39 by MD 39A.

MD 828

Maryland Route 828 is the unsigned designation for a spur of old alignment from MD 42 west of Friendsville. The road serves the local refuse and recycling center. MD 828A is the unsigned designation for section of old alignment between two dead ends parallel to MD 42 near Blooming Rose Road west of Friendsville. The state highway is connected to MD 42 by MD 42A.

MD 830