Maryland Route 831 is a collection of unsigned

Unsigned highway

An unsigned highway is a highway that has been assigned a route number, but does not bear conventional road markings that would normally be used to identify the route with that number...

 state highways

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

. Eight of the nine highways are sections of the old alignment of MD 36

Maryland Route 36

Maryland Route 36 is a state highway located in Allegany County, Maryland, United States. MD 36's southern terminus is at the WV 46 bridge in Westernport and its northern terminus at U.S. Route 40 Alternate near Cumberland...

 between Frostburg

Frostburg, Maryland

Frostburg is a city in Allegany County, Maryland, United States located at the head of the Georges Creek Valley. It is part of the Cumberland, MD-WV Metropolitan Statistical Area. The population was 7,873 at the 2000 census...

 and Cumberland

Cumberland, Maryland

Cumberland is a city in the far western, Appalachian portion of Maryland, United States. It is the county seat of Allegany County, and the primary city of the Cumberland, MD-WV Metropolitan Statistical Area. At the 2010 census, the city had a population of 20,859, and the metropolitan area had a...

 in northwestern Allegany County

Allegany County, Maryland

Allegany County is a county located in the northwestern part of the US state of Maryland. It is part of the Cumberland, MD-WV Metropolitan Statistical Area. As of 2010, the population was 75,087. Its county seat is Cumberland...

. The segments of MD 831 range from MD 831A at MD 36's northern terminus to MD 831G south of Frostburg. MD 831H and MD 831I are spurs from MD 831C and MD 831A, respectively. MD 831J is a section of the old alignment of MD 31

Maryland Route 31

Maryland Route 31 is a state highway in the U.S. state of Maryland. Known for most of its length as New Windsor Road, the state highway runs from MD 26 in Libertytown east to MD 140 in Westminster. MD 31 connects the county seats of Frederick and Westminster via Libertytown in eastern Frederick...

 in New Windsor

New Windsor, Maryland

New Windsor is a town in Carroll County, Maryland, United States. The population was 1,303 at the 2000 census. It is a suburb of Westminster, which is about 6 miles east of New Windsor on Maryland Route 31. It contains many neighborhoods, the most known being the 100-acre Atlee Ridge, or "The...

 in Carroll County

Carroll County, Maryland

Carroll County is a county located in the U.S. state of Maryland. In 2010, its population was 167,134. It was named for Charles Carroll of Carrollton , signer of the American Declaration of Independence. Its county seat is Westminster....

.

Allegany County

• MD 831A is the designation for Old Mount Savage Road, an old alignment of MD 36 near MD 36's northern terminus between Corriganville
  Corriganville, Maryland
  Corriganville is an unincorporated town in Allegany County, Maryland, USA. The town lies north of Cumberland at the confluence of Wills Creek and Jennings Run...
  
   and Cumberland. The state highway runs 0.48 mile (0.7724832 km) between US 40 Alternate and MD 36. At its northern end, it follows Dakota Road a very short distance to connect back with MD 36 while MD 831I (Dakota Avenue) continues north on the old alignment to a dead end.

• MD 831B is the designation for Old Mount Savage Road, an old alignment of MD 36 south of Corriganville. The state highway runs 0.11 mile (0.1770274 km) between two dead ends with an intersection with Homewood Street, which is unsigned MD 36C between MD 831B and MD 36.

• MD 831C is the designation for Kriegbaum Road, an old alignment of MD 36 through Corriganville. The state highway runs east–west 0.9 miles (1.4 km) between two intersections with MD 36. Near the highway's western end, the old alignment continues west as MD 831H to a dead end.

• MD 831D is the designation for Portertown Road, a 0.37 mile (0.5954558 km) section of old alignment of MD 36 between Corriganville and Barrelville
  Barrelville, Maryland
  Barrelville is an unincorporated community in Allegany County, Maryland, United States. It is located between Corriganville and Mount Savage, where an 1804 road from Pennsylvania intersected the legendary Turkey Foot Road....
  
  .

• MD 831F is an unnamed 0.04 mile (0.0643736 km) spur west from MD 47 in Barrelville.

• MD 831G is the designation for Caboose Road, a 0.12 mile (0.1931208 km) spur from MD 936 south of Frostburg just north of Interstate 68.

• MD 831H is an unnamed 0.07 mile (0.1126538 km) spur from MD 831C near its western terminus to a dead end.

• MD 831I is the designation for Dakota Avenue, a 0.04 mile (0.0643736 km) spur from MD 831A near its northern terminus to a dead end.

Carroll County

• MD 831J is the designation for a 0.08 mile (0.1287472 km) section of Main Street between two intersections with MD 31, which is High Street at the western intersection and Main Street and Green Valley Road at the eastern intersection, in New Windsor.