Interstate 495 (Massachusetts)

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Interstate 495

Blue Star Memorial Highway
I-495 highlighted in red
Route information
Auxiliary route of I-95
Maintained by MassDOT
Length121.56 mi[1] (195.63 km)
NHSEntire route
Major junctions
South end I-195 / Route 25 in Wareham
Major intersections
North end I-95 in Salisbury
CountryUnited States
CountiesPlymouth, Bristol, Norfolk, Worcester, Middlesex, Essex
Highway system
I-395 I-695

Interstate 495 (I-495) is an auxiliary route of I-95 in the US state of Massachusetts, maintained by the Massachusetts Department of Transportation (MassDOT). Spanning 121.56 miles (195.63 km), it is the second-longest auxiliary route in the Interstate Highway System, being roughly 11 miles (18 km) shorter than I-476 in Pennsylvania.[2]

Serving as one of two beltways (the other being Route 128) that forms a semicircle around Boston, and being the "outer" beltway, I-495 has its northern terminus in Salisbury, where it splits from I-95. Its route forms an arc with an approximately 30-mile (48 km) radius around the city and intersects seven additional radial expressways: I-93, US Route 3 (US 3), Route 2, I-290, I-90 (Massachusetts Turnpike), Route 24, and I-95 once more. I-495 has its southern terminus in Wareham, at the meeting of I-195 and Route 25. Originally, the stretch from Route 24 to I-195 was signed as Route 25, that status now only begins east of I-195.

I-495 and areas to its immediate east are often regarded as the inner ring of Greater Boston. The freeway's northern segment parallels the New Hampshire border, at one point coming as close as 400 feet (120 m) to the boundary, and its southern end is roughly 10 miles (16 km) north of Cape Cod. West of I-495 is the Worcester area and Central Massachusetts. I-495 is a heavily traveled route serving communities in Plymouth, Bristol, Norfolk, Worcester, Essex, and Middlesex counties.

Route description

I-495 bridge over the Merrimack River in Lawrence

I-495 begins as the direct continuation of Route 25 at the intersection with I-195 in West Wareham. It starts as a two-lane highway in both directions. It gets the third lane during the interchange with Route 24. The junction includes the unusual transition of shrinking from the six-lane Route 25 to the four-lane interstate due to the third lane of Route 25 joining to and from I-195. The road heads roughly northwest, passing through the towns of Rochester and Middleborough (where the road meets US 44) as a four-lane highway before entering Bristol County, crossing the Taunton River at Raynham. I-495 becomes a six-lane highway just southeast of the Route 24 interchange (which is actually in neighboring Bridgewater).

The road continues northwest through Taunton and Norton before entering Mansfield, where there is a short collector–distributor road concurrency with Route 140. I-495 makes its southern junction with its parent route, I-95, on the border between Mansfield in Bristol County and Foxborough in Norfolk County. The road continues through Plainville (where there is a junction with US 1. The highway comes within two miles (3.2 km) of the Rhode Island state line before turning in a more northerly direction through Franklin and Bellingham.

I-495 passes through Milford, Medway, Hopkinton (where the junction with the Massachusetts Turnpike, or I-90, is located), and Westborough (where the road meets Route 9). It then continues through Southborough, Marlborough (where the road meets US 20 and I-290), Hudson, Berlin, Bolton (where the road finally begins to turn northeasterly), and Harvard.

Continuing to turn to a more easterly direction, the road passes through Boxborough, Littleton (where there is an intersection with Route 2), Westford and Chelmsford. At the Chelmsford–Lowell line lies the intersection with US 3 and the Lowell Connector (formerly I-495 Business). The road continues through Lowell and Tewksbury before entering Essex County at Andover, directly at exit 94 (formerly exit 39).

In Andover, the road has a junction with I-93. It then enters the city of Lawrence, where the road turns due north, crossing the Shawsheen River into North Andover before crossing the Merrimack River at the O'Reilly Bridge back into Lawrence. It then heads into Methuen, where the road turns back to a northeasterly route after the junction with Route 213 (Loop Connector). The road heads into Haverhill, crossing the Merrimack twice more at a bend in the Bradford section of town. It passes north of downtown Haverhill, coming within 150 yards (140 m) of the New Hampshire state line, the closest the road comes to leaving the state. I-495 then passes through the towns of Merrimac and Amesbury before entering Salisbury where it immediately meets I-95 and ends approximately 1.5 miles (2.4 km) south of where that Interstate enters New Hampshire.

Throughout its path, the road passes closely to several existing state highways. From Wareham through to the Middleborough Rotary, it parallels Route 28. For much of the stretch between Norton and Milford, the road is within a few miles of Route 140, with two junctions of that highway in Mansfield and Franklin. From Milford to Bolton, the road passes just west of Route 85. Much of the northern third of the route also roughly parallels Route 110.


As early as the late 1940s, a plan was developing for an "outer circumferential highway" around Boston, a limited-access freeway meant to have an approximate 30-mile (48 km) radius from the Boston city center. A portion of this new "outer circumferential highway" southeast of the US 1 junction in Foxborough was meant to be a "relocation" of the existing Route 28, which was quickly changed in 1947 to a new designation of Route 25 as a full-length freeway from the Route 24 expressway in Raynham to Wareham. The section of I-495 between Route 24 in Raynham and I-95 at the Foxborough–Mansfield town line began construction at I-95 in 1976 and finished at the Route 25/Route 24 interchange in 1982. (Prior to 1982, I-495 ended at I-95; the section from Raynham to Wareham was just signed as Route 25). Route 25 was constructed in stages from the late 1950s to the late 1960s.


In 2014, a new intelligent transportation system system was installed to help commuters and the state better understand the traffic congestion on I-495.[3] Some improvements expected to come to I-495 in the next few years include a project that will install fiber-optic cable, traffic cameras, and variable-message signs on I-495 from I-90 (Hopkinton) to I-93 (Andover).

In 2015, the state pledged $165 million to 285 million (equivalent to $200 million to $346 million in 2022[4]) for improvements to the I-495/Massachusetts Turnpike intersection and is considering three different plans. The work is expected to begin in 2021[needs update] and be completed in 2025.[5] Improvements to the I-495/Route 9 intersection will commence at the same duration, with a different budget.[6]

Exit list

Interchanges were to be renumbered to mileage-based numbers under a project scheduled to start in 2016; however, this project was indefinitely postponed by MassDOT until November 18, 2019, when MassDOT confirmed that, beginning in late summer 2020, the exit renumbering project would start.[7][8] On May 7, 2021, MassDOT announced that I-495 exit numbers would get renumbered starting on or after May 16, 2021, and it would last for approximately five weeks. The project was broken down into four sections:

  • Segment 1: between Route 28 and I-95 (old exits 3–13)
  • Segment 2: between I-95 and I-90 (old exits 14–22)
  • Segment 3: between I-90 and US 3 (old exits 23–35)
  • Segment 4: between US 3 and junction Route 110/I-95 (old exits 37–55)

CountyLocation[9]mi[9]kmOld exitNew exit[10]Destinations[10]Notes
Route 25 east – Cape Cod
Continuation east
I-195 west – Wareham, New Bedford, Providence, RI
Eastern terminus of I-195; exit 40B on I-195; Signed as New Bedford, Providence, RI NB; trumpet interchange.
Route 58 north – Carver, Plymouth
No signage for Route 58 south, which ends at Route 28, 0.45 miles (720 m) to the south
Middleborough7.60012.23138 Route 28 – Rock Village, South Middleboro
12.06819.422412 Route 105 – Middleboro Center, Lakeville
Route 18 / US 44 east – Bridgewater, Plymouth, Lakeville, New Bedford
US 44 only appears on northbound signage
14.72223.693615 US 44 – Middleboro, Plymouth, Taunton, Providence, RI
Bridgewater19.08130.708719 Route 24 – Boston, Fall RiverSigned as exits 19A (north) and 19B (south); exit 22 on Route 24
BristolRaynham21.68134.892822 Route 138 – Stoughton, Taunton
Taunton24.50839.442925Bay Street – Taunton, Easton

Route 123 to Route 140 south – Norton, Easton
No southbound signage for Route 140
Route 140 south – Norton
No northbound exit
Route 140 north – Mansfield
32.89752.9431333 I-95 – Boston, Providence, RISigned as exits 33A (north) and 33B (south); exit 12 on I-95
NorfolkFoxboroughExit 33B located in Foxborough
Plainville35.58057.2601436 US 1 – Wrentham, North AttleboroSigned as exits 36A (north) and 36B (south); exit 36A access to Gillette Stadium and Patriot Place
Wrentham37.56560.4551538 Route 1A – Wrentham, Plainville
Franklin40.95465.9091641King Street – Franklin, Woonsocket, RI
43.18369.4961743 Route 140 – Franklin, Bellingham
Bellingham45.82073.7401846 Route 126 – Medway, Bellingham
WorcesterMilford48.31877.7601948 Route 109 – Milford, MedwayTo Route 16
50.24580.8612050 Route 85 – Milford, Hopkinton
MiddlesexHopkinton54.15187.1482154W. Main Street – Hopkinton, UptonSigned as exits 54A (east) and 54B (west)
county line
HopkintonWestborough line57.92893.2262258
I-90 Toll / Mass Pike – Boston, Albany, NY
Exit 106 on I-90
WorcesterWestborough59.44395.6642359 Route 9 – Framingham, WorcesterSigned as exits 59A (east) and 59B (west)
county line
SouthboroughMarlborough line61.75899.39023C62Simarano Drive – Marlboro, SouthboroInterchange constructed in 2000
MiddlesexMarlborough63.155101.6382463 US 20 – Marlboro, NorthboroSigned as exits 63A (east) and 63B (west)
64.895104.43825A65A Route 85 – Hudson, MarlboroAccess to Route 85 via unsigned Route 85 Connector
I-290 west – Worcester
Eastern terminus of I-290; exit 32 on I-290
WorcesterBerlin67.314108.3312667 Route 62 – Berlin, Hudson
Bolton70.006112.6642770 Route 117 – Bolton, Stow
MiddlesexBoxborough74.652120.1412875 Route 111 – Boxboro, Harvard
Littleton77.641124.9512978 Route 2 – Boston, LeominsterSigned as exits 78A (east) and 78B (west); exit 113 on Route 2
79.176127.4213079 Route 2A / Route 110 – Littleton, Ayer
80.209129.0843180 Route 119 – Littleton, Groton
To Route 110 (Boston Road) – Westford
To Route 225 – Carlisle
Chelmsford87.328140.5413387 Route 4 – Chelmsford, North ChelmsfordNorthbound exit and southbound entrance
Route 110 to Route 4 – Chelmsford, Lowell
No signage for Route 4 northbound
US 3 south – Burlington
Access via C/D lanes; exits 81A-B on US 3 north
US 3 north – Nashua, NH
Access to and from C/D lanes; exits 81B-A on US 3 south, to Manchester-Boston Regional Airport
Lowell89.425143.91635C89CLowell ConnectorFormerly exit 36; access via C/D lanes; exits 2A and 1B on Lowell Conn.
91.192146.7593791Woburn Street – South Lowell, North Billerica
Tewksbury92.284148.5173892 Route 38 – Lowell, Tewksbury
county line
TewksburyAndover line94.613152.2653994 Route 133 – Tewksbury, AndoverSouthbound off-ramp begins in Essex County
EssexAndover97.023156.1434097 I-93 – Boston, Salem, NHSigned as exits 97A (south) and 97B (north); exit 40 on I-93
99.411159.9864199 Route 28 – Lawrence, AndoverSigned as exits 99A (south) and 99B (north) northbound
Lawrence100.149161.17442100 Route 114 – North Andover, South LawrenceSigned as exits 100A (east) and 100B (west)
North Andover100.953162.46843101Massachusetts Avenue – North AndoverSouthbound access from C/D lanes originating at Marston St. exit
North AndoverLawrence line101.370–
44102Merrimack StreetAccess via C/D lanes; NB ramp exits onto SB C/D lanes to Merrimack St.; NB entrance includes direct entrance from Sutton Street
Lawrence45A103ACommonwealth Drive
Marston Street north – Methuen
Northbound signage; accessible to and from C/D lanes
Southbound signage; accessible to and from C/D lanes
45B103BMarston Street south – LawrenceAccess to and from C/D lanes
Methuen103.121165.95746104 Route 110 (Merrimack Street) – Pleasant Valley

Route 213 (Loop Connector) to I-93 north – Methuen, Salem NH
Exit 5 on Route 213; eastern terminus of Rte. 213
To Route 125 – Ward Hill, Bradford
Access via Industrial Avenue
106.624171.59549107 Route 110 / Route 113 (River Street)
107.303172.68750108 Route 97 – Haverhill, Salem, NH
108.997175.41451109 Route 125 – Haverhill, Plaistow, NHSigned as exits 109A (south) and 109B (north)
111.182178.93052111 Route 110 – Haverhill, Merrimac
Merrimac114.894184.90453115Broad Street – Merrimac, Merrimacport
Amesbury117.854189.66854118 Route 150 – Amesbury, Seabrook, NH

Route 110 east to I-95 south – Salisbury, Boston
Northbound exit and southbound entrance
I-95 north – Portsmouth, NH
Northern terminus; exit 89 on I-95; access to I-95 south via Route 110
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 12, 2023.
  2. ^ Pennsylvania Turnpike Commission Archived 2012-02-13 at the Wayback Machine, November 1, 1996.
  3. ^ MassDOT (April 2014). "A 2014 Synthesis; the Status of Intelligent Transportation Systems Deployment" (PDF). Massachusetts Department of Transportation. Retrieved January 6, 2016.
  4. ^ Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved December 19, 2023. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
  5. ^ Worcester Telegram (March 29, 2015). "State outlines improvements to congested I-495-Mass Pike interchange". Worcester Telegram & Gazette. Retrieved January 6, 2016.
  6. ^ MassDOT (November 7, 2012). "Interstate 495/Route 9 Interchange Improvement Study". Massachusetts Department of Transportation. Retrieved January 6, 2016.
  7. ^ Commonwealth of Massachusetts (2015). "COMMBUYS — Bid Solicitation FAP# HSIP-002S(874) Exit Signage Conversion to Milepost-Based Numbering System along Various Interstates, Routes and the Lowell Connector". Retrieved January 6, 2016.
  8. ^ Robert H. Malme (2017). "Massachusetts Interstate Highways Exit Lists". Retrieved January 18, 2017.
  9. ^ a b MassDOT Planning Division. "Massachusetts Route Log Application". Massachusetts Department of Transportation. Archived from the original on August 26, 2014. Retrieved August 21, 2014.
  10. ^ a b Massachusetts Department of Transportation. "Exit Numbers and Names: Route I-495 (Wareham to Salisbury)". Archived from the original on May 27, 2016. Retrieved August 21, 2014.

External links