This is a list of bus routes operated by the Washington Metropolitan Area Transit Authority (WMATA), branded as Metrobus in Montgomery County and Prince George's County in Maryland. Most of the routes operated under Streetcars in Washington, D.C. and Maryland prior to the 1960s.

Numbering Most Metrobus routes in MD were formerly designated with a letter followed by a number, but some routes had double-digit numbers. The routes in Prince George's County would typically have a letter followed by two numbers.

Odd-numbered routes were typically part-time variants of even-numbered routes. At one time, odd-numbered routes were express routes, but that distinction was later abandoned. Most odd-numbered routes operated during rush hours and/or with limited bus stops that had a few of them running into the off-peak hours.

As of WMATA's Better Bus Redesign beginning on June 29, 2025, all the routes entirely within Maryland begin with an "M" and a "P."

History Many current routes operate under former streetcar routes. The Streetcars provided the main transportation in the Maryland area from the 1800s to the 1960s. At Google Books. Two separate companies, the Washington, Virginia, and Maryland Coach Company (WV&M), and the Washington Marlboro and Annapolis Motor Lines (WM&A), would also operate on the former streetcar routes and provide service to parts of MD when the Streetcars ended service. In 1973, WMATA acquired the two bus companies along with other bus companies to form its current Metrobus system. At one point, most MD routes would enter into Downtown before Metro was built in which all buses would terminate at stations in various locations. Today, the main MD hub is at Silver Spring Metro station.

When Ride On began service, most Metrobus routes in Montgomery County were slowly transferred into Ride On routes through the years as it would be cheaper to operate under another carrier. The same thing went with TheBus.

Due to the COVID-19 pandemic, the Metrobus service was mostly reduced to Sunday service schedules during the weekdays with selected routes suspended from March 18 to August 22, 2020. Routes 83, A12, C4, D12, F4, J2, K6, P12, T18, Y2, and Z8 were the only routes that ran during the weekends with the rest of the routes suspended. Beginning on August 23, 2020, more routes came back during the weekdays and weekends returning the Metrobus service to 75%. Most of the Metrobus service and routes resumed on September 5, 2021.

On November 21, 2024, WMATA approved its Better Bus Network Redesign plan, which began development in 2022. Under the plan, all the routes would be renamed with easier-to-understand route designations, and would modify most of its existing routes to make the bus system easier to use, faster, and more reliable. The Better Bus Network Redesign was implemented on June 29, 2025, with all the Maryland routes being renamed with an "M" for the Montgomery County routes and a "P" for the Prince George's County routes. The routes that primarily serve Washington, DC have bus stops in Maryland and were renamed with a "C" for crosstown and a "D" for downtown.

Routes Most of the Maryland buses remain inside of Prince George's County and Montgomery County. However, a few routes enter into Washington DC, which were a part of their former streetcar lines. Only one current route (P90) operates between Maryland and Virginia.

Montgomery County routes

RouteTerminals Streets traveled Service notes DivisionsM12University Boulevard Wheaton Twinbrook↔Takoma Langley Crossroads Transit Center Hyattsville Crossing University Blvd Riggs Rd East-West Hwy Part of 12-minute frequent service network Additional trips operate between Wheaton and Takoma Langley Crossroads Transit Center MontgomeryM20Wheaton–Silver SpringICC Park & Ride (weekdays only) Wheaton (late night and weekends)↔ Silver Spring(Paul S. Sarbanes Transit Center)Georgia Av Part of 12-minute frequent service network between Silver Spring and Wheaton stations Late night weekday and all weekend service operates between Wheaton and Silver Spring MontgomeryM22Olney–BethesdaMedStar Montgomery Medical Center↔ Wheaton (late night) Bethesda Connecticut Av Georgia AvLate night service operates between MedStar Montgomery Medical Center and Wheaton MontgomeryM42Randolph Rd–College Park North Bethesda ↔ College Park Randolph Rd New Hampshire Av U.S. Route 1 Baltimore Av MontgomeryM44Randolph Rd–Hyattsville Crossing North Bethesda ↔ Hyattsville Crossing Randolph Rd Powder Mill Rd U.S. Route 1 Baltimore Av MontgomeryM52Colesville Rd–BurtonsvilleSouth Laurel Park & Ride (peak hours) Burtonsville Park & Ride (off-peak & weekends) ↔ Silver Spring(Paul S. Sarbanes Transit Center) Cherry Ln Sandy Spring Rd Old Columbia Pike Columbia Pike Lockwood Dr Colesville Rd Part of 20-minute frequent service network Weekday peak-hour service is extended to Laurel. MontgomeryM54Colesville Rd–GreencastleGreencastle Park & Ride ↔ Silver Spring(Paul S. Sarbanes Transit Center) Briggs Chaney Rd Old Columbia Pike Lockwood Dr Colesville RdPart of 20-minute frequent service network MontgomeryM60New Hampshire AvWhite Oak Medical Center(Plum Orchard Dr & Healing Way) ↔ Fort TottenNew Hampshire AvPart of 12-minute frequent service network BladensburgM6XNew Hampshire Av LimitedHillandale (FDA) ↔ Fort TottenNew Hampshire AvWeekday peak service only MontgomeryM70East West HwyMontgomery Mall Transit Center ↔ Silver Spring(Paul S. Sarbanes Transit Center) Old Georgetown Rd East-West HwyPart of 12-minute frequent service network MontgomeryM82River Rd–Falls Rd Rockville ↔ Friendship Heights Falls Rd River Rd Montgomery

Route history Route HistoryM12Existing routing of the former route C4.M20Existing routing of the former route Y7.M22A combination of the former routes Y2 and Y8 between Wheaton station and Olney and the former route L8 between Kensington and Chevy Chase.M42A combination of the former route 83 between College Park station and Cherry Hill, and the former route C8 between North Bethesda station and Adventist Healthcare White Oak Medical Center.M44A combination of the former route 86 between Hyattsville Crossing station and Calverton, and the former route C8 between North Bethesda station and Adventist Healthcare White Oak Medical Center.M52A combination of the former routes Z6 and Z7.M54Existing routing of the former route Z8 with the service to Briggs Chaney Park & Ride and Castle Boulevard being eliminated.M60Existing routing of the former route K6 with an extension to Adventist Healthcare White Oak Medical Center via Columbia Pike.M6XExisting routing of the former route K9.M70Existing routing of the former route J2.M82Existing routing of the former route T2.

Prince George's County routes RouteTerminals Streets traveled Service notes DivisionsP10Baltimore Av Rhode Island Avenue↔ College Park U.S. Route 1 Baltimore Av Rhode Island Av NE LandoverP12Laurel–GreenbeltSouth Laurel Park & Ride ↔ Greenbelt Cherrywood Ln Kenilworth Av Edmonston Rd U.S. Route 1 Baltimore Av LandoverP14Kenilworth Av Deanwood ↔ Greenbelt Kenilworth Av Edmonston Rd LandoverP15Riggs Rd–AdelphiAdelphi(Riggs Rd & Edwards Way) ↔ Fort Totten Riggs Rd 23rd AvWeekday peak service only (AM to Fort Totten, PM to Adelphi) BladensburgP16Riggs Rd–White OakWhite Oak Medical Center(Plum Orchard Dr & Healing Way) ↔ Fort Totten Riggs Rd 23rd Av BladensburgP1XBaltimore Av Limited Rhode Island Avenue↔IKEA Way(College Park) U.S. Route 1 Baltimore Av Rhode Island Av NEPart of 20-minute frequent service network LandoverP20Greenbelt Rd–New Carrollton Greenbelt ↔ New Carrollton Greenbelt Rd Lanham-Severn Rd Annapolis Rd LandoverP21Hanover Pkwy–New Carrollton Greenbelt ↔ New Carrollton Greenbelt Rd Hanover Pkwy Princess Garden Pkwy Annapolis Rd LandoverP24Good Luck RdBowie State University Goddard Corporate Park (Mission Dr) ↔ New Carrollton Good Luck Rd Cipriano Rd Lanham-Severn RdLate night and Sunday service operates between New Carrollton and Goddard Corporate Park only LandoverP30New Carrollton–Silver Spring Silver Spring(Paul S. Sarbanes Transit Center) ↔ New Carrollton East-West Hwy Philadelphia Av Riverdale Rd Queensbury RdPart of 12-minute frequent service network LandoverP31New Carrollton–Takoma LangleyTakoma Langley Crossroads Transit Center ↔ New Carrollton University Blvd Finns Lane Riverdale Road LandoverP32Greenbelt–Fort Totten Greenbelt ↔ Fort Totten Adelphi Rd Ager Rd Chillum Rd Greenbelt Rd Sargent Rd LandoverP33Queens Chapel RdHighview Apartments ↔ Brookland Queens Chapel Rd Michigan Av NE LandoverP35New Carrollton–Fort Totten New Carrollton ↔ Fort Totten Good Luck Rd Finns Ln Riverdale Rd East-West Hwy Sargent RdWeekday service only LandoverP40Annapolis Rd New Carrollton ↔ Rhode Island Avenue Annapolis Rd Rhode Island Av NEPart of 12-minute frequent service network LandoverP41Landover RdCapital Plaza ↔ Downtown LargoLandover RdPart of 20-minute frequent service network LandoverP42Chillum Rd–New Carrollton New Carrollton ↔ Takoma Chillum Rd Riverdale Rd Edmonston Rd LandoverP60MLK Hwy–Suitland New Carrollton ↔ Suitland Martin Luther King Jr Hwy Addison Rd Silver Hill RdPart of 12-minute frequent service network LandoverP61Glenarden–Suitland New Carrollton ↔ Suitland Brightseat Rd Walker Mill Rd Marlboro Pike LandoverP62Deanwood–Branch Av Deanwood ↔ Branch Avenue Addison Rd Walker Mill Rd Central Av Forestville Rd Allentown Rd LandoverP63Central Av–Naylor Rd Downtown Largo ↔ Naylor Road Central Av Larchmont Av Southern Av LandoverP66Forestville–SuitlandForestville(8411 Old Marlboro Pike) ↔ Suitland Silver Hill Rd Pennsylvania AvSelect weekday peak service ends/begins at Penn Mar Shopping Center Andrews Federal CenterP72Central Av–Bowie Downtown Largo ↔Bowie Park & Ride Central Av Mitchellville Rd LandoverP73Central Av–Trade Zone Downtown Largo ↔Collington CenterCentral AvWeekday service only LandoverP87Brinkley Rd Suitland ↔Oxon Hill Park & Ride Allentown Rd Brinkley Rd Suitland Rd Oxon Hill Rd Andrews Federal CenterP90St Barnabas Rd Suitland ↔Oxon Hill Park & Ride King Street–Old Town St. Barnabas Rd Oxon Hill Rd Monument Av/MGM National Av I-495 Part of 20-minute frequent service network Weekday trips alternate ending at Oxon Hill and King Street–Old Town Andrews Federal CenterP93Suitland–Birchwood Suitland ↔Birchwood City Silver Hill Rd Iverson St Wheeler Rd Southern Av Livingston RdPart of 12-minute frequent service network alongside route P94 Andrews Federal CenterP94Suitland–National Harbor Suitland ↔National Harbor(St. George Blvd & Waterfront St) Silver Hill Rd Iverson St Wheeler Rd Southern Av SE Livingston Rd Monument Av/MGM National AvPart of 12-minute frequent service network alongside route P93 Andrews Federal CenterP96Suitland–Oxon Hill Suitland ↔Oxon Hill Park & RideOxon Hill Rd Andrews Federal CenterP97Southern Av–Ft WashingtonFort Washington Park & Ride ↔ Southern Avenue Fort Washington Rd Fort Foote Rd Oxon Hill Rd Southern AvWeekday service only Shepherd Parkway

Route history Route HistoryP10Modified routing of the former route 86 with service to Calverton being replaced by route M44.P12Existing routing of the former route 89M with new weekend service added.P14Modified routing of the former route R12 with service that serves the Berwyn Heights neighborhood instead of Beltway Plaza.