TheMassachusetts Bay Transportation Authoritybus division operates 151 bus routes in theBoston,Massachusetts metropolitan area. All routes connect toMBTA subway,MBTA Commuter Rail, and/or other MBTA bus services. Many routes are descendants of thestreetcar routes of theBoston Elevated Railway, or of suburban companies including theEastern Massachusetts Street Railway andMiddlesex and Boston Street Railway. 147 routes are directly operated by the MBTA, while private companies operate four routes under contract. Four additional suburban operations are partially funded by the MBTA.

Most buses charge local bus fare ($1.70 one-way as of 2024). The Silver Line waterfront services (SL1, SL2, SL3, and SLW) charge the standard subway fare ($2.40 one-way as of 2024). Express buses have a local portion within a community (which charge the local bus fare), and an express portion that takes a highway to or from downtown Boston (which charges a higher fare of $4.25 as of 2024).^[1]

A number of routes were temporarily suspended or placed on modified routings during the COVID-19 pandemic; overall service levels were restored to pre-COVID levels in 2021, though some routes were not restored. Since 2018, the MBTA has been planning a major bus network overhaul, with implementation expected to be complete in 2028.^[2] The first changes took place in December 2024.^[3]

TheSilver Line is a six-routebus rapid transit system marketed asrapid transit. It is divided into two branches: Waterfront service (SL1, SL2, SL3, and the rush-hour SLW shuttle) that runs through the South Boston Transitway tunnel, and Washington Street service (SL4 and SL5) that runs on the surface viaWashington Street. The Waterfront service costs the same as a subway fare, while the Washington Street service costs a regular bus fare. All Silver Line routes use articulated 60-foot (18 m) buses; the Waterfront routes use hybrid buses with extended battery range for electric operation in the tunnel.

The SL5 route was created in 2002 as a replacement for theWashington Street Elevated. The Shuttle route began operations in 2004, followed by the SL2 and SL3 (former) in 2004 and SL1 in 2005 when dual-mode buses became available. The SL4 was introduced in 2009 as a replacement for thecanceled Phase III tunnel. A new SL3 route to Chelsea opened in 2018.^[4]

The twocrosstown (CT) routes providelimited-stop service on two routes that connect major subway and bus transfer points. Three crosstown routes were created by the MBTA in 1994; route CT1 was merged with route 1 in 2019.^[4]

These routes provide almost all local service in the core of the metropolitan area; most were originallyBoston Elevated Railway streetcar routes. They were originally numbered roughly clockwise from southeast to northeast, with 4 the furthest south inSouth Boston and 121 the furthest north (roughly) inEast Boston. The BERy folded into theMetropolitan Transit Authority in 1947, and the M.T.A. in turn was reorganized as the MBTA in 1964. Despite some changes, including minor routes being merged into trunk routes, the core service network has remained roughly intact since the BERy eta. New routes have been added during the M.T.A. and MBTA eras.^[4]

Seven routes –52,59,61,62,67,70, and76 – serve more distant western suburbs includingBedford,Waltham,Lexington, andNeedham. They are descendants of routes acquired from theMiddlesex and Boston Street Railway in 1972, which were subsequently renumbered using previously discontinued designations.^[4]

Fourteen routes –1,15,22,23,28,32,39,57,66,71,73,77,111, and116 – were designated askey bus routes in 2004. The highest–ridership routes in the system, they supplement the subway system to provide frequent service to thedensest areas of the city. Key bus routes typically operate at higher frequencies than other routes.^[5] As part of the implementation of the MBTA's Bus Network Redesign program beginning in 2024, the key bus route terminology is being phased out and replaced by a larger frequent route network. Routes 28 and 39 use 60-foot articulated buses.

Four early morning round trips are run between outlying stations andHaymarket, each running over portions of several local routes. Although intended primarily for station agents, they are open to all passengers. The trips are internally numbered 191–194, but are shown in timetables as variants of local routes.^[4]

Numbers from 131 to 137 operate in theMelrose area; their routings are based on routes operated as part of the formerEastern Massachusetts Street Railway, which was folded into the MBTA system in 1968. The since-discontinued 136 and the 137 were briefly operated as far asLowell andLawrence, their original Eastern Mass terminals, while under MBTA control. The 132 was a Service Bus Lines route which was not operated by the MBTA until 1975.^[4]

Route 171 is a special low-service route – a replacement for early morning CT3 service when it was cut back fromLogan Airport in 2002. Other numbers in the 170s were previously used for special routes, largely short-lived routes serving industrial areas.^[4]

The 20 belt route was created by the M.T.A. in 1962 as a combination of the 20 and 21 stub routes inherited from BERy. In 2005, the MBTA redesignated the two directions of the loop as the 201 and 202 to avoid confusion about which way each bus ran.^[4]

These routes operate in theQuincy area. Routes 210-245 are based on routes originally operated by theEastern Massachusetts Street Railway (folded into the MBTA in 1968) which mostly ran intoFields Corner station. When the Red Line's Braintree Branch opened in phases in 1971 and 1980s, these routes were rerouted to terminate at the new rapid transit stations (principallyQuincy Center).^[4]

These routes operate in theBurlington andWoburn area. They are the descendants of the Eastern Massachusetts Street Railway's Lowell–Boston route, which was inherited intact by the MBTA in 1968 and soon cut back to Burlington.^[4]

These routes operate in theLynn area and theNorth Shore. Two routes that run toHaymarket have weekendshort-turn variants (labeled with aW suffix) that terminate atWonderland. The 411 and 430 were Service Bus Lines routes that were acquired by the MBTA in 1975; the other routes are largely Eastern Massachusetts Street Railway routes acquired in 1968.^[4]

These routes operate express betweenNewton and downtown Boston via theMassachusetts Turnpike (I-90). The 500 series routes were created by the MBTA in the 1960s to take advantage of the newly constructed turnpike extension into Boston. The 550 series routes wereMiddlesex and Boston Street Railway routes toNewton Corner that were extended to downtown Boston in the 1960s and taken over by the MBTA in 1972. They were cut back to Newton Corner in 2020.^[4]

The MBTA provides partial subsidy for some suburban routes outside its usual service area that connect with MBTA bus, subway, or commuter rail service. Routes 712-716 are radial commuter routes were taken over from various private operators (Rapid Transit Inc. for the 712/713, Nantasket Transportation for the 714, and Hudson Bus Lines for the 716).^[4]

The non-numbered routes (listed here by their designator on MBTA maps) are local circulator services founded by the municipalities with partial MBTA subsidy.^[4] All are operated by private companies under contract, except for the Beverly Shuttle which is operated by theCape Ann Transportation Authority.

Wikimedia Commons has media related toMBTA bus routes.

• MBTA – Bus schedules and maps

• MBTA bus routes
• Massachusetts transportation-related lists
• Boston-related lists
• Lists of bus routes in the United States

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