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.

[1] Maryland Route 820 is the unsigned designation for the westernmost end of Castle Hall Road.

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.

[1][19] MD 822 was constructed as a new access road to the University of Maryland Eastern Shore campus and opened to traffic in 2001.

Maryland Route 827 is the unsigned designation for two short sections of old alignment of MD 39 in western Garrett County.

Maryland Route 828 is the unsigned designation for a 0.13-mile (0.21 km) spur of old alignment from MD 42 west of Friendsville.

[1][35] Maryland Route 831 is a collection of nine unsigned state highways, eight of which are sections of the old alignment of MD 36 between Frostburg and Cumberland in northwestern Allegany County.

MD 834 intersects both directions of US 301 and provides access to the Bay Country Welcome Center in the wide median of US 301.

[1][46] Maryland Route 835 is a collection of thirteen state highways that are service roads or old alignments in the vicinity of MD 18 and US 50 and US 301 in western Queen Anne's County.

Maryland Route 837 is the unsigned designation for Church Circle, which runs 0.12 miles (0.19 km) from MD 300 (Main Street) north and east to MD 313 (Church Street) in the northwest quadrant of Sudlersville in northern Queen Anne's County.

The state agreed to take over the road because it was well paved with a wide right of way and provided a bypass of the MD 300–MD 313 intersection with unobstructed views at its termini, in contrast with the dangerous, blind intersection of Main Street and Church Street in the center of town.

[1][62] Maryland Route 846 is the unsigned designation for a pair of unnamed roads southeast of the MD 64–MD 418 junction in Ringgold.

[1][64] Maryland Route 853 is the unsigned designation for four sections of old alignment of MD 194 between Taneytown and the Pennsylvania state line in northwestern Carroll County.

[1][67] Maryland Route 864 is the unsigned designation for Bessicks Corner Road, which runs 0.11 miles (0.18 km) between a pair of intersections with MD 292 on either side of county-maintained Bessicks Corner Road west of Still Pond in northern Kent County.

Maryland Route 872 is the designation for the unnamed 0.33-mile (0.53 km) service road that parallels the westbound direction of US 340 west from MD 180 near Petersville.

[1][72] Maryland Route 874 is the designation for two sections of old alignment of MD 75 between New Market and New London in eastern Frederick County.

[1][77] Maryland Route 879 is the designation for five sections of old alignment of MD 91 between Gamber and Finksburg in eastern Carroll County.

Maryland Route 889 is the unsigned designation for an unnamed road running from a dead end near a SHA garage south to MD 137 in Hereford, Baltimore County.

[1] Maryland Route 894 is the designation for Limestone Road, a 0.10-mile (0.16 km) section of old alignment of US 522 from MD 144 north to a ramp from southbound US 522 in Hancock.

[1] Maryland Route 899A is another section of the American Way, 0.09 miles (0.14 km) long, branching from MD 28 to its end.