Maryland Route 410 (MD 410) is a state highway in the U.S. state of Maryland. Known for most of its length as East–West Highway, the highway runs 13.92 miles (22.40 km) from MD 355 in Bethesda east to Pennsy Drive in Landover Hills. MD 410 serves as a major east–west commuter route through the inner suburbs on the north side of Washington, D.C. (hence its name), connecting the commercial districts of Bethesda, Silver Spring, and Hyattsville; in addition, the highway serves the industrial area of Landover Hills and the residential suburbs of Chevy Chase, Takoma Park, Chillum, Riverdale. and East Riverdale. The road connects many of the arterial highways and freeways that head out of Washington as well as transit hubs centered on stations of the Washington Metro in Bethesda, Silver Spring, Hyattsville, and New Carrollton, with additional connections to MARC and Amtrak.
MD 410 was originally built along mostly new alignment between Bethesda and Silver Spring in the late 1920s. The highway was extended east to Hyattsville in the mid-1930s. While the Montgomery County portion has not changed much in the ensuing decades, MD 410 has been realigned and extended multiple times within Prince George's County. These changes include an extension along existing roads further into Hyattsville in the mid-1940s, a realignment within Hyattsville in the mid-1950s, an extension through Riverdale in the late 1960s, and the final extension to Landover Hills in the early 1990s.
MD 410 is maintained by the Maryland State Highway Administration (MDSHA) except for three municipally maintained segments in the city of Takoma Park and a short stretch maintained by Prince George's County in East Riverdale. The segments maintained by the city of Takoma Park run from Chestnut Avenue to near Cedar Avenue for 0.17 miles (0.27 km); from Maple Avenue to MD 195 for 0.27 miles (0.43 km); and from the second junction with MD 195 to Elm Avenue, the longest non–state maintained portion with a length of 0.53 miles (0.85 km). MD 410 is county maintained for 0.35 miles (0.56 km) from the Baltimore–Washington Parkway to its turn onto Veterans Parkway in East Riverdale. The highway is a part of the National Highway System as a principal arterial for its entire length except for between US 50 and its eastern terminus at Pennsy Drive.
MD 410 begins at a pair of junctions with MD 355 (Wisconsin Avenue) and MD 187 (Old Georgetown Road) on either side of Bethesda Station on the Washington Metro's Red Line in downtown Bethesda. Westbound MD 410 ends at the intersection of two-way MD 355 and the southern terminus of MD 187, which begins one-way northbound along Old Georgetown Road. Traffic from the southbound direction of MD 187 follows Woodmont Avenue and Montgomery Lane to the start of eastbound MD 410 at the intersection of MD 355 and Montgomery Avenue. MD 410 heads east as a one-way pair—East–West Highway westbound and Montgomery Avenue eastbound—to the eastern edge of downtown Bethesda, where the two directions converge east of Bethesda-Chevy Chase High School. From that intersection, which includes a U-turn ramp from Montgomery Avenue to westbound East–West Highway, the state highway continues east as four-lane undivided East–West Highway and crosses over the Capital Crescent Trail.
MD 410 follows the northern edge of the town of Chevy Chase and crosses Coquellin Run, then follows the southern edge of Columbia Country Club to its intersection with MD 185 (Connecticut Avenue). The highway leaves the town of Chevy Chase and passes through an unincorporated area of Chevy Chase, within which the highway meets the northern end of MD 186 (Brookville Road) and descends into the valley of Rock Creek. At the bottom of the hill, MD 410 intersects Jones Mill Road and Beach Drive, the main road through Rock Creek Park. The state highway crosses Rock Creek, passes to the north of Meadowbrook Park and leaves the valley as a four-lane road with narrow median and flanking service roads. MD 410 reaches the top of the hill at Grubb Road and descends into the valley of a branch of Rock Creek. The highway becomes undivided at Sundale Drive and crosses the stream just west of the northern corner of the District of Columbia and its attendant boundary marker, then leaves the stream valley and ascends to an intersection with MD 390 (16th Street) at the western edge of downtown Silver Spring.
MD 410 intersects MD 384 (Colesville Road) next to the headquarters of the National Oceanic and Atmospheric Administration and just south of Silver Spring Station, which serves the Washington Metro's Red Line and the MARC Brunswick Line. The highway parallels CSX's Metropolitan Subdivision and the Red Line southeast to a five-way intersection with US 29 (Georgia Avenue) and 13th Street; there is no direct access from eastbound MD 410 to northbound US 29 or from southbound US 29 to eastbound MD 410. MD 410 continues east on three-lane Burlington Avenue–two lanes westbound and one lane eastbound—to cross the rail and metro lines. At Fenton Street, the highway veers southeast onto two-lane Philadelphia Avenue and enters the city of Takoma Park as it passes by the Takoma Park/Silver Spring campus of Montgomery College. MD 410 intersects MD 320 (Piney Branch Road) and has a four-way stop at Holly Avenue next to Takoma Park Elementary School. The highway continues through an intersection with Maple Avenue next to the Takoma Park Library, then follows Philadelphia Avenue to its end at MD 195 (Carroll Avenue) at Takoma Junction. MD 410 runs concurrently with MD 195 for one block, then continues east along Ethan Allen Avenue, which the highway follows through a three-way stop at Jackson Avenue to the eastern city limit of Takoma Park and the Montgomery—Prince George's county line at MD 650 (New Hampshire Avenue).
MD 410's name becomes East–West Highway again as it heads east from MD 650 as a four-lane undivided highway through the northern part of Chillum. The highway has frontage roads on either side of its crossing of Sligo Creek, then becomes divided ahead of its intersection with MD 212 (Riggs Road). MD 410 briefly has six lanes as it heads southeast to Ager Road, which leads toward the West Hyattsville Station on the Washington Metro's Green Line. MD 410 has a partial intersection with Ager Road; the missing movements between MD 410 and Ager Road are made via 23rd Avenue to the east. MD 410 crosses Northwest Branch Anacostia River and enters the city of Hyattsville. The highway expands to six lanes as it passes between The Mall at Prince George's and Prince George's Plaza Station on the Green Line. East of University Town Center and the headquarters of the National Center for Health Statistics, MD 410 has a four-way intersection with the northern end of MD 500 (Queens Chapel Road) and the southern end of Adelphi Road.
MD 410 continues east between Hyattsville to the south and the town of University Park to the north; the south side of the six-lane divided highway becomes flanked by the town of Riverdale Park ahead of its intersection with US 1 (Baltimore Avenue). The highway fully enters Riverdale Park east of US 1, where it reduces to four lanes and crosses over CSX's Capital Subdivision, which carries MARC's Camden Line. The Camden Line is accessed by the Riverdale railroad station within the Riverdale Park Historic District to the south, which contains the Riversdale Mansion. A tributary of Northeast Branch Anacostia River briefly runs within the median of the highway shortly before the highway crosses over Northeast Branch. MD 410 intersects MD 201 (Kenilworth Avenue) and leaves the town of Riverdale Park. The highway continues as Riverdale Road, a four-lane road with center turn lane, through the unincorporated area of East Riverdale on its way to a diamond interchange with the Baltimore–Washington Parkway (unsigned MD 295).
MD 410 continues east on Riverdale Road then turns southeast onto Veterans Parkway, a four-lane divided highway, while Riverdale Road continues toward New Carrollton. The highway briefly enters the city of New Carrollton around its intersection with MD 450 (Annapolis Road). MD 410 continues south and intersects Ellin Road before passing through a diamond interchange with US 50 (John Hanson Highway). The highway crosses over the Amtrak Northeast Corridor, MARC's Penn Line, and the Washington Metro's Orange Line. South of the railroad tracks, MD 410 reaches its eastern terminus at Pennsy Drive, which leads to Ardwick Ardmore Road and the primary entrance to New Carrollton Station, which serves as the eastern terminus of the Orange Line and hosts MARC and Amtrak service. Secondary access to the station is provided by Ellin Road north of US 50.
The Bethesda – Silver Spring Highway was conceived in the late 1920s as a means of directly connecting the two inner suburbs on the north side of Washington. The highway was under construction between 1927 and 1929 and signed as MD 410 by 1930. When completed, MD 410 extended between what was then US 240 in Bethesda and 16th Street in Silver Spring, which had been extended north from the District of Columbia in 1928. Continuing to the present center of Silver Spring required heading south on 16th Street to Blair Portal, then east on Colesville Road, which had been extended to Blair Portal in 1927, to Georgia Avenue. Most of MD 410 was built on a new alignment with the exception of the part between present day MD 186 and Jones Mill Road, which followed the old Brookville Road.
By 1933, the new state highway was the busiest road in Montgomery County. The road, which became known as East–West Highway, was originally built with a width of 20 feet, but the heavy traffic led the Maryland State Roads Commission (SRC), the predecessor of MDSHA, to suggest in 1934 that the road be widened to 40 feet in the near future. SRC also recommended extending East–West Highway through Silver Spring and Takoma Park to Hyattsville. By 1935, the highway was extended along new alignment east from 16th Street to Takoma Park, then placed on Philadelphia Avenue and Ethan Allen Avenue within Takoma Park. The extension to MD 212 in Hyattsville was completed in 1936.
After World War II, MD 410 was extended even further east and saw significant improvement on its extant sections. By 1946, MD 410 was extended over Ager Road, Hamilton Street, 38th Avenue, and Jefferson Avenue, roads then designated MD 209, to a new eastern terminus at US 1 in Hyattsville. In addition, the pre-1946 course saw completion of efforts to widen the road to 40 feet. The highway between Connecticut Avenue (then MD 193) and Georgia Avenue (US 29) was widened in 1946 and 1947. The two segments between Wisconsin Avenue (US 240) and Connecticut Avenue (MD 193) and between MD 650 in Takoma Park and US 1 in Hyattsville were widened in 1950.
Beyond minor improvements, MD 410 in Montgomery County has remained in much the same state since 1950. The only major change was the highway being split onto a one-way pair of streets in Bethesda in 1988. The Prince George's County section has seen more substantial changes over the intervening decades. The first major change in alignment occurred in 1956, when MD 410 was completed on a new alignment as a four-lane divided highway between Ager Road just east of MD 212 and MD 500 at what is now Adelphi Road. The state highway was subsequently extended east over what was previously MD 403, known as Colesville Road, to US 1 in Riverdale.
The next change occurred between 1967 and 1970, when MD 410 was extended as a four-lane divided highway on a new alignment east past MD 201 to the Baltimore–Washington Parkway. This extension bypassed and replaced MD 412 between US 1 and the B-W Parkway. The adjoining segment of MD 410 between MD 500 and US 1 was also upgraded to a multi-lane divided highway by 1970. Finally, MD 410 was extended east on Veterans Parkway past US 50 to its current terminus at Pennsy Drive when that section of highway was completed in 1991.
MD 410 has one former auxiliary route. MD 410A was the designation for the 0.25-mile (0.40 km) portion of Belcrest Road between MD 500 and MD 410 in Hyattsville. The route was assigned by 1999. MD 410A was transferred to county maintenance in 2004.