U.S. Route 3
|Length||277.90 mi (447.24 km)|
|South end||Route 2A / Route 3 in Cambridge, MA|
|North end||Route 257 near Chartierville, Quebec|
|States||Massachusetts, New Hampshire|
NH: Hillsborough, Merrimack, Belknap, Grafton, Coos
U.S. Route 3 (US 3) is a United States highway running 277.9 miles (447.2 km) from Boston, Massachusetts, through New Hampshire, to the Canada–US border near Third Connecticut Lake, where it connects to Quebec Route 257.
Massachusetts Route 3 connects to the southern terminus of US 3 in Cambridge and continues south to Cape Cod. Though it shares a number, it has never been part of US 3. Both routes, which connect end-to-end, are treated as a single 91.3-mile (146.9 km) state highway by the MassDOT. From Boston to Burlington, U.S. 3 is routed on surface streets through the dense suburbs in the Greater Boston area. After a brief concurrency with the Massachusetts Route 128 freeway, the route follows its own freeway northwest, bypassing Lowell and entering New Hampshire at Nashua.
In New Hampshire, current and former parts of US 3 are known as the Daniel Webster Highway. From Burlington, Massachusetts, to Nashua, New Hampshire, US 3 is a freeway. The segment in New Hampshire is a free portion of the Everett Turnpike, while the portion in Massachusetts is known as the Northwest Expressway. From where it leaves the Everett Turnpike in Nashua northwards, US 3 is generally a 2-4 lane at-grade road, though there are two super two freeway portions in northern New Hampshire, one on the Laconia Bypass, and one where US 3 and Interstate 93 use the Franconia Notch Parkway. The route serves as a major local arterial, connecting many of the cities of the densely populated Merrimack River Valley. North of the White Mountains, the route serves as one of the only north-south roads connecting the communities of the Great North Woods Region and has New Hampshire's only border crossing between the US and Canada.
Boston to Burlington
US 3 begins in the south on the Longfellow Bridge in Boston. After it crosses the Charles River, it heads west along Memorial Drive in Cambridge, along the river’s southern bank, at an interchange with Massachusetts Avenue (Route 2A). The road continues as southbound Massachusetts Route 3 towards downtown Boston, while northbound US Route 3 heads west, then north along the river towards Harvard University, joining with Route 2 along the way. It runs along the north bank of the Charles River, opposite Soldiers Field Road in Allston along this stretch. Passing south of Harvard Square, US 3 and Route 2 transition onto the Fresh Pond Parkway and join Route 16. Near the Alewife MBTA station, Route 2 splits off as a freeway to the west (Concord Turnpike), while US 3 / Route 16 stay on the Alewife Brook Parkway. Shortly thereafter, US 3 splits from the Parkway (which continues as Route 16) and joins Route 2A (Massachusetts Avenue) westbound, crossing into Arlington. In the center of town, US 3 and Route 2A split from Massachusetts Avenue and overlap briefly with Route 60 before continuing along Mystic Street. Route 2A splits from US 3 just to the north. US 3 continues through parts of Winchester and Woburn without any major intersections before entering Burlington and interchanging with Interstate 95 / Route 128 (Yankee Division Highway) at exit 51A. US 3 joins the freeway to connect with the Northwest Expressway, while its historic surface alignment continues as Route 3A.
Burlington to Tyngsborough (Northwest Expressway)
US 3 runs along 1.6 miles (2.6 km) of I-95 (Route 128) in a wrong-way concurrency before exiting at exit 50A onto its own freeway, the Northwest Expressway.
Originally built in the 1950s, before the cancellation of the Inner Belt, the US 3 freeway was to have extended into metro Boston before being truncated to I-95. Consequently, a partially completed cloverleaf interchange connects US 3 to I-95. Exit numbers on the US 3 freeway start at mile marker 72 since MA-3 and U.S 3 are counted as one highway by MassDOT
The freeway closely parallels Route 3A, the historic alignment of US 3, along its entire 19-mile (31 km) length from Burlington to the New Hampshire state border. It passes through Billerica and into Chelmsford, where it connects with I-495 and the Lowell Connector, a freeway spur into downtown Lowell. Continuing north, the freeway briefly enters Lowell, then passes through North Chelmsford and Tyngsborough before crossing the state line into Nashua, New Hampshire. The freeway continues north as the Frederick E. Everett Turnpike.
US 3 is one of New Hampshire's most well-known roads, as it passes through most of the state's major cities and towns and is the only highway to extend from the Massachusetts state border in the south to the Canada–US border in the north. Running for 242 miles (389 km) in New Hampshire, US 3 is by far the longest signed highway in the state. For much of its routing, US 3 closely parallels I-93, serving as a local route to the freeway.
US 3 crosses the state border into Nashua and immediately becomes concurrent with the Everett Turnpike, running on the freeway for 6.7 miles (10.8 km) along the western side of the city. US 3 leaves the Everett Turnpike at exit 7E, crosses NH 101A and turns northeast for approximately 1.5 miles (2.4 km) along a segment known as the Henri Burque Highway, before turning north onto Concord Street, which soon becomes known as the Daniel Webster Highway. (Some locals erroneously refer to the Everett Turnpike from exit 7 through the I-293 interchange as Route 3 and refer to the actual US 3 only as the Daniel Webster Highway or "Old Route 3".)
US 3 continues north through the town of Merrimack and into Bedford, where it becomes South River Road. The highway parallels I-293 until it turns east in Manchester and then crosses the Merrimack River on Queen City Avenue, just after its intersection with I-293 / NH 3A and NH 114A. US 3 and NH 3A are signed in a wrong-way concurrency for approximately 0.6 miles (0.97 km) before US 3 turns north onto Elm Street towards downtown Manchester. After approximately 2.2 miles (3.5 km), US 3 turns east onto Webster Street, then joins NH 28 to proceed in a northeasterly direction towards Hooksett, interchanging with I-93. The two routes continue as Hooksett Road, then the Daniel Webster Highway.
In Suncook, NH 28 leaves to the northeast, and US 3 proceeds northwest towards Concord on Pembroke Street, becoming Manchester Street when it enters the Concord city limits. After crossing the Merrimack River and interchanging with I-93, US 3 intersects NH 3A (South Main Street), which terminates at its parent route. US 3 traverses downtown Concord as North and South Main streets (briefly overlapping with US 202 and NH 9), then follows North State Street to Fisherville Road to Village Street in Penacook before crossing the Contoocook River into Boscawen. US 3 travels north through Boscawen, briefly overlapping with US 4. The highway parallels the Merrimack River north into Franklin, where the highway meets NH 11. US 3 joins NH 11 and turns east; NH 3A also resumes at this intersection, continuing north. US 3 and NH 11 briefly form a three-route concurrency with NH 127 in Franklin, then pass through Tilton, crossing NH 132 and passing the western end of NH 140. Continuing northeast past Lake Winnisquam, US 3 and NH 11 reach Laconia and turn onto the Laconia-Gilford Bypass, intersecting with NH 106, NH 107, and NH 11A. At the northern end of the bypass, US 3 and NH 11 split after a 17.3-mile (27.8 km) overlap, with the U.S. highway continuing north on Lake Street to Weirs Beach and an intersection with NH 11B. US 3 continues north as the Daniel Webster Highway to Meredith at the northern end of Meredith Bay on Lake Winnipesaukee. In Meredith, US 3 intersects the northern terminus of NH 106, then joins NH 25 and continues north past Squam Lake into Holderness, passing the western termini of NH 25B and NH 113. Through Holderness, US 3 and NH 25 gradually turn west, then southwest, passing the southern end of NH 175, and then reaching the northern end of NH 132 in Ashland.
From Ashland to North Woodstock, US 3 proceeds north, roughly paralleling I-93 in the Pemigewasset River valley. Along this stretch it passes through the towns of Plymouth (NH 25 splits from US 3 near I-93 in Plymouth, which also marks the true northern terminus of NH 3A), West Campton (where it meets the western end of NH 49, the principal access road to Waterville Valley), Thornton, and Woodstock. In North Woodstock, US 3 crosses NH 112 (known to the east as the Kancamagus Highway).
Continuing north, US 3 joins with I-93 as it passes through Franconia Notch State Park, one of the more scenic drives in the White Mountains. This stretch of freeway is known as the Franconia Notch Parkway and is a rare section Interstate highway with only one lane in each direction.
US 3 separates from I-93 at exit 35, shortly north of the northern park boundary in Franconia. From there, NH 141 branches northwest and US 3 heads north and east toward Twin Mountain and a junction with US 302. This portion of the road is noted for fairly frequent moose sightings, especially during sunrise and sunset when moose are particularly active.
Heading north from Twin Mountain, US 3 passes through the village of Carroll, where NH 115 branches to the northeast and US 3 bears to the northwest and the town of Whitefield. In the center of Whitefield, NH 142 branches to the northwest and NH 116 crosses, running roughly southwest to northeast. US 3 continues north to Lancaster, where it joins US 2 in the town center, and where NH 135 branches off to the west. After US 2 leaves to the west, US 3 continues north, roughly paralleling the course of the Connecticut River (which also forms the border with Vermont), through Northumberland and Groveton, where NH 110 ends. North of Groveton, US 3 continues to follow the river, through Stratford, North Stratford, and Columbia, until it reaches Colebrook, where it crosses NH 26 and meets the southern terminus of NH 145. Still following the Connecticut River north, US 3 passes through portions of Stewartstown and Clarksville. In Stewartstown, the road turns more directly east (still following the Connecticut River, which is no longer a boundary), before resuming a northeasterly direction through Pittsburg. Its last major intersection is at the northern terminus of NH 145. US 3 continues north for another 22 miles (35 km), eventually reaching the Pittsburg–Chartierville Border Crossing, where the road crosses into Chartierville, Quebec and becomes Quebec Route 257.
In total, US 3 runs along the Connecticut River and its source lakes for approximately 70 miles (110 km).
New England Interstate
Before the establishment of the U.S. Highway system, the section of US 3 / Massachusetts Route 3 from Orleans, Massachusetts, to Colebrook, New Hampshire, was part of the New England road marking system as New England Interstate Route 6 (NEI 6 or NE-6). It was replaced in its entirety with the establishment of US 3 and Massachusetts Route 3 in 1926.
The modern Northwest Expressway was begun near Route 110 in Lowell before World War II. In the 1950s, it was extended south to Route 128 (later overlapped by I-95), and by the 1960s, it was completed north from Chelmsford to New Hampshire. By 2005, the chronically congested four-lane road, largely with antiquated ramps around Lowell, was widened to six lanes (as it had been in Nashua, New Hampshire, a few years prior) with a breakdown lane on both the left and right sides of the road, and many interchanges were modernized in what was comically known as "The Big Wide", in reference to Massachusetts' other "Big" construction project (the Big Dig). The roadbed and bridges were built to support a fourth lane in each travel direction for future expansion. The $365 million, 21-mile (34 km) widening project was completed in 2005 from Burlington to the New Hampshire border.
The final section of the expressway was planned for inner suburban towns northwest of Boston, Massachusetts. The expressway was to supply a new route for U.S. Route 3, between MA 128 and the cancelled Interstate-695/Inner Belt. This was one of the expressway projects cancelled in Gov. Francis Sargent's 1970 moratorium on expressway construction within MA 128. The latter section of the expressway was a key component of the "Master Plan Highway Plan for Metropolitan Boston." The highway would have traveled through Lexington, Arlington, Medford, Somerville, and Cambridge, before linking with the Inner Belt Expressway.
The original plan called for U.S. 3 and MA 2 to link up at the Lexington-Arlington border, and continue southeasterly, crossing MA 16/Mystic Valley Parkway at the Arlington-Somerville border and proceeding into Cambridge toward Union Square, Somerville. A 1962 plan called for Routes 2 and 3 to converge at Alewife Brook Parkway with a longer stretch of new highway for Route 3 paralleling Lowell Street in Lexington and Summer Street in Arlington.
Exit numbers along the Northwest Expressway section in Massachusetts were to be changed to mileage based numbers under a project to start in 2016, but that project was postponed. However, in November 2019, the MassDOT announced it would be proceeding with the project in late summer of 2020.
According to the AASHTO route log, the southern terminus of US 3 is at the junction of Route 2A and Route 3 in Cambridge, which is where Route 2A crosses the Charles along the Harvard Bridge (also known as the Massachusetts Avenue Bridge). This is a change from AASHTO's 1989 Route Log which placed the terminus at US 20 in Boston, where Route 2 currently meets US 20 after crossing the Charles River at the Boston University Bridge. This was where US 3 met US 1 until that highway was re-routed in 1971.
The original northern terminus of US 3 (in 1926) was at Colebrook, New Hampshire, but the highway was extended to West Stewartstown in 1928, and to Pittsburg in 1937. Colebrook was the northern terminus again from 1939 to 1940. Since 1940, the highway has run through Pittsburg to the Pittsburg–Chartierville Border Crossing.
Although the MassDOT inventories Massachusetts Route 3 and US 3 as one continuous route, this table includes the mileage only for US 3 starting from its southern terminus in Cambridge.
|State||County||Location||mi||km||Old exit||New exit||Destinations||Notes|
|Massachusetts||Middlesex||Cambridge||0.000||0.000||Route 2A east (Massachusetts Avenue south) / Route 3 south (Memorial Drive) – Boston||Diamond interchange; southern terminus of US 3; northern terminus of Route 3; no direct access from US 3 to westbound Route 2A|
|1.047||1.685||Route 2 east (Boston University Bridge) – Cambridgeport, Brookline||Roundabout interchange; south end of concurrency with Route 2|
|3.975||6.397||Route 16 west (Huron Avenue) – Watertown, West Newton||South end of concurrency with Route 16|
|5.444||8.761||Route 2 west (Concord Turnpike) – Concord||North end of concurrency with Route 2|
|5.820||9.366||Route 16 / Route 2A east (Massachusetts Avenue) / Alewife Brook Parkway north – Medford, Harvard Square, Cambridge||North end of concurrency with Route 16; south end of concurrency with Route 2A|
|Arlington||7.198||11.584||Route 60 west (Pleasant Street) – Belmont||South end of concurrency with Route 60|
|7.283||11.721||Route 60 east (Chestnut Street) – Medford, Malden||North end of concurrency with Route 60|
|7.457||12.001||Route 2A west (Summer Street) / Mystic Valley Parkway east – Lexington, Concord||North end of concurrency with Route 2A|
|Burlington||13.442||21.633||I-95 north (Route 128 north) / Route 3A north (Cambridge Street) – Burlington, Portsmouth, NH||Interchange; south end of concurrency with I-95/Route 128; I-95 exit 33A|
|14.866||23.925||I-95 north / Route 128 north – Portsmouth, NH, Gloucester||I-95 north exit 32A; north end of concurrency with I-95/Route 128; US 3 follows I-95 C/D lanes|
|32B||50B||Middlesex Turnpike – Burlington||Shared exit with I-95 C/D lanes|
|25B||72B||I-95 south / Route 128 south – Providence RI||Exit 32A (old exit 50A) on I-95|
|Bedford||17.646||28.398||26||73||Route 62 (Burlington Road) – Burlington, Bedford|
|Billerica||21.167||34.065||27||76||Concord Road – Billerica, Bedford|
|22.591||36.357||28||78||Treble Cove Road – North Billerica, Carlisle|
|Chelmsford||24.691||39.736||29||79||Route 129 (Billerica Road) – Billerica, Chelmsford|
|25.554||41.125||30B||80||Lowell Connector north||No southbound exit; indirect southbound access to Lowell Connector via exit 81A, to exit 35C on I-495|
|30||81A-B||I-495 – Marlboro, Lawrence||Split into exits 81A (north) and 81B (south)|
|26.571||42.762||31||81C||Route 110 (Chelmsford Street) – Lowell, Chelmsford|
|28.762||46.288||32||84||Route 4 (North Road) – North Chelmsford, Chelmsford|
|30.819||49.598||33||86||Route 40 (Groton Road) – Westford, North Chelmsford|
|Tyngsborough||33.029||53.155||34||88||Westford Road – Tyngsborough, Westford|
|34.644||55.754||35||90||Route 113 (Kendall Road) – Dunstable, Tyngsborough|
New Hampshire line
Hillsborough county line
|36||91||Middlesex Road – South Nashua NH||No southbound exit; northbound entrance extends into New Hampshire, where it merges with exit 1|
|South end of Everett Turnpike|
|New Hampshire||Hillsborough||Nashua||0.834||1.342||1||Spit Brook Road – South Nashua|
|1.553||2.499||2||To NH 3A / Daniel Webster Highway – Hudson||Access via the Circumferential Highway; signed as exit 1A from northbound collector-distributor lane|
|2.819||4.537||3||Daniel Webster Highway – South Nashua||Southbound left exit and northbound entrance|
|3.055||4.917||4||East Dunstable Road||FAA Center signage was removed at the request of the FAA shortly after 9/11|
|4.724||7.603||5||NH 111 to NH 111A – Nashua, Hudson, Pepperell, MA||Signed as exits 5E (east) and 5W (west)|
|5.059||8.142||5A||Simon Street||Northbound exit only, formerly exit 5EA|
|6.285||10.115||6||NH 130 (Broad Street) – Nashua, Hollis, Brookline|
|6.781||10.913|| Everett Turnpike north – Manchester, Concord|
NH 101A – Nashua Downtown, Amherst, Milford
|Exit 7 on Everett Turnpike; northern end of concurrency with the Everett Turnpike|
|Merrimack||10.832||17.432||Industrial Drive to Everett Turnpike||Exit 10 on Everett Tpke.|
|12.109||19.488||Greeley Street to Everett Turnpike – Concord, Boston, MA||Exit 11 on Everett Tpke.|
|15.745||25.339||Bedford Road to Everett Turnpike south||Exit 12 on Everett Tpke.|
|Raymond Wieczorek Drive To NH 3A / Everett Turnpike – Manchester Airport, Litchfield, Concord, Nashua||Exit 13 on Everett Tpke.|
|20.900||33.635||NH 101 east to I-293 / Everett Turnpike – Boston, Concord, Manchester Airport||Southbound exit to and entrance from NH 101 east via Meetinghouse Road|
|21.331||34.329||Kilton Road to NH 101 west / NH 114 – Bedford Ctr., Milford|
|Manchester||22.690||36.516||NH 114A west / I-293 / NH 3A north – Concord, Boston||Exit 4 on I-293; eastern terminus of NH 114A; southern terminus of wrong-way concurrency with NH 3A|
|23.333||37.551||NH 3A south (South Elm Street)||Northern end of wrong-way concurrency with NH 3A|
|25.974||41.801||NH 28 south (Beech Street / Maple Street)||Southern end of concurrency with NH 28|
|I-93 to NH 101 – Salem, Boston, Concord, Plymouth||Exit 9 on I-93|
|28.586||46.005||NH 28A south – Londonderry||Northern terminus of NH 28A|
|29.082||46.803||NH 27 east – Candia, Raymond||Western terminus of NH 27|
|29.578||47.601||NH 28 Bypass south – Derry||Northern terminus of NH 28 Bypass|
|Allenstown||35.237||56.708||NH 28 north – Epsom, Alton||Northern end of concurrency with NH 28|
|Pembroke||39.506||63.579||NH 106 north – Loudon, Laconia||Southern terminus of NH 106|
|Concord||41.704||67.116||Korean Veterans Memorial Bridge over the Merrimack River|
|I-93 to I-89 / I-393 – Manchester, Lebanon, Plymouth, Portsmouth||Exit 13 on I-93|
|42.173||67.871||NH 3A south (Main Street)||Southern end of silent concurrency with NH 3A|
|42.729||68.766||US 202 west / NH 9 west (Pleasant Street)||Southern end of concurrency with US 202 / NH 9|
|43.024||69.240||NH 9 east (Loudon Road) to I-93||Northern end of concurrency with NH 9|
|43.411||69.863||US 202 east to I-393 east||Northern end of concurrency with US 202|
|Boscawen||50.812||81.774||US 4 east to I-93 – Concord||Southern end of concurrency with US 4|
|52.168||83.956||US 4 west – Salisbury, Andover||Northern end of concurrency with US 4|
|Franklin||60.645||97.599||NH 127 south – Salisbury||Southern end of concurrency with NH 127|
|61.307||98.664||NH 3A north / NH 11 west – Andover, Bristol||Northern end of concurrency with NH 3A; southern end of concurrency with NH 11|
|61.755||99.385||NH 127 north – New Hampton||Northern end of concurrency with NH 127|
|Belknap||Tilton||64.925||104.487||NH 132 south to I-93 south – Northfield, Concord||Southern end of concurrency with NH 132|
| I-93 – Canterbury, Concord, Boston, New Hampton, Plymouth|
NH 140 east – Belmont, Gilmanton
|Exit 20 on I-93; western terminus of NH 140|
|66.678||107.308||NH 132 north – Sanbornton||Northern end of concurrency with NH 132|
|Belmont||72.845||117.233||NH 11A east – Laconia downtown||Western terminus of NH 11A|
|Laconia||74.355||119.663||NH 106 to NH 107 – Laconia, Belmont, Concord||Partial interchange; no southbound exit to NH 106 north; no northbound entrance from NH 106 south|
|74.999||120.699||NH 107 – Laconia, Gilmanton||Partial interchange; southbound exit and northbound entrance|
|Gilford||76.040||122.375||NH 11A – Gilford, Laconia||Interchange|
|78.649||126.573||NH 11 east – Alton||Northern end of concurrency with NH 11|
|Gilford–Laconia line||79.442||127.850||NH 107 south (Union Ave.) – Laconia||Northern terminus of NH 107|
|Laconia||82.684||133.067||NH 11B south – Gilford, Alton Bay||Northern terminus of NH 11B|
|Meredith||86.334||138.941||NH 106 south – Laconia||Northern terminus of NH 106|
|86.847||139.767||NH 104 west to I-93 – New Hampton||Eastern terminus of NH 104|
|87.693||141.128||NH 25 east – Center Harbor, Ossipee, Conway||Southern end of concurrency with NH 25|
|Center Harbor||90.778||146.093||NH 25B – Center Harbor||Western terminus of NH 25B|
|Grafton||Holderness||95.526||153.734||NH 113 – Sandwich||Southern terminus of NH 113|
|96.661||155.561||NH 175 – Campton||Southern terminus of NH 175|
|Ashland||99.271||159.761||NH 132 – New Hampton, Tilton||Northern terminus of NH 132|
|I-93 – Tilton, Concord, Plymouth, Campton||Exit 24 on I-93|
|Plymouth||105.397||169.620||NH 175A to I-93 – Holderness||Western terminus of NH 175A|
|106.202||170.916||NH 3A south / NH 25 west to I-93 – Rumney, Bristol, Concord, Littleton||Interchange; northern end of concurrency with NH 25; northern terminus of NH 3A|
|Campton||109.525||176.263||To I-93 – Campton, Littleton, Plymouth, Concord||Exit 27 on I-93 via Blair Road|
|112.375||180.850||NH 49 to I-93 – Campton, Waterville Valley||Western terminus of NH 49|
|I-93 – Plymouth, Concord, Franconia, Littleton||Exit 29 on I-93|
|I-93 – Franconia, Littleton, St. Johnsbury, VT, Plymouth, Concord||Exit 30 on I-93|
|125.420||201.844||NH 175 – Campton||Northern terminus of NH 175|
|126.031||202.827||NH 112 to I-93 – Lincoln, Conway, Woodsville|
|I-93 – Concord, Littleton||Exit 33 on I-93|
|131.562||211.729||I-93 south||Exit 34A on I-93; southern end of concurrency with I-93 and the Franconia Notch Parkway; southbound exit only|
|Franconia||135.923||218.747||34B||Cannon Mountain Tramway – Old Man Historic Site||Exit numbers follow I-93|
|136.623||219.873||34C||NH 18 – Echo Lake Beach, Peabody Slopes, Cannon Mountain, South Franconia||Southern terminus of NH 18|
|138.080||222.218||I-93 north||Exit 35 on I-93; northern end of concurrency with I-93 and the Franconia Notch Parkway; northbound exit only|
|139.044||223.770||NH 141 to I-93 north – Franconia||Eastern terminus of NH 141|
|Coos||Carroll||148.497||238.983||US 302 – Bethlehem, Bretton Woods, Conway||In village of Twin Mountain|
|150.510||242.222||NH 115 – Jefferson, Berlin, Gorham||Southern terminus of NH 115|
|Whitefield||156.871||252.459||NH 116 south / NH 142 south – Bethlehem, Littleton||Southern end of concurrency with NH 116 / NH 142|
|156.918||252.535||NH 142 north – Dalton||Northern end of concurrency with NH 142|
|156.959||252.601||NH 116 north – Jefferson, Gorham||Northern end of concurrency with NH 116|
|Lancaster||165.330||266.073||US 2 east – Jefferson, Gorham, Berlin||Southern end of concurrency with US 2|
|165.372||266.140||NH 135 – Dalton, Gilman VT||Northern terminus of NH 135|
|166.126||267.354||US 2 west – Vermont||Northern end of concurrency with US 2|
|Northumberland||175.152||281.880||NH 110 – Stark, Berlin||Western terminus of NH 110 in village of Groveton|
|North Stratford||188.576||303.484||To VT 105 – Bloomfield VT|
|Colebrook||201.458||324.215||NH 26 east – Dixville Notch||Southern end of concurrency with NH 26|
|201.565||324.387||NH 26 west (Bridge St.)||Northern end of concurrency with NH 26|
|201.647||324.519||NH 145 north – Clarksville||Southern terminus of NH 145|
|Pittsburg||219.573||353.368||NH 145 south – Colebrook||Northern terminus of NH 145|
|241.953||389.386||Route 257||Continuation into Quebec|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
US 3 has one existing special route, a business route through Laconia, New Hampshire. Three other special routes may have existed in the past: a business route between Tyngsborough, Massachusetts, and Concord, New Hampshire, and bypass routes around Concord and Nashua, New Hampshire.
Laconia business loop
|Location||Belmont, New Hampshire–Laconia, New Hampshire|
|Length||4.144 mi (6.669 km)|
U.S. Route 3 Business is a 4.144-mile-long (6.669 km) long signed business route running north–south through downtown Laconia, New Hampshire. It runs from US 3 and New Hampshire Route 11 in Belmont north to US 3 in Laconia, along NH 107 and NH 11A. It is a former alignment of U.S. 3, used before the Laconia-Gilford bypass was built.
- Bureau of Planning & Community Assistance (February 20, 2015). "NH Public Roads". Concord, New Hampshire: New Hampshire Department of Transportation. Retrieved April 7, 2015.
- "Northwest Expressway (US 3)". Bostonroads.com. Retrieved 2019-07-08.
- "Boston's Big Dig that never was" http://www.bettnet.com/bostons_big_dig_that_never_was/
- "COMMBUYS Solicitation:FAP# HSIP-002S(874) Exit Signage Conversion to Milepost-Based Numbering System along Various Interstates, Routes and the Lowell Connector". Commonwealth of Massachusetts. Missing or empty
- Robert H. Malme (2017). "Massachusetts Interstate Highways Exit Lists". Retrieved January 18, 2017.
- "Milepost-based Exit Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
- "Route Number Database". AASHTO. 2009. Retrieved October 14, 2015.
- "U.S. Numbered Highways, 1989 Edition" (PDF). AASHTO. 1989. Retrieved October 14, 2015.
- Bureau of Planning & Community Assistance (April 3, 2015). "Nodal Reference 2015, State of New Hampshire". New Hampshire Department of Transportation. Retrieved April 7, 2015.[permanent dead link]
- City of Nashua, Hillsborough County
- Town of Merrimack, Hillsborough County
- Town of Bedford, Hillsborough County[permanent dead link]
- City of Manchester, Hillsborough County[permanent dead link]
- Town of Hooksett, Merrimack County[permanent dead link]
- Town of Allenstown, Merrimack County
- Town of Pembroke, Merrimack County[permanent dead link]
- City of Concord, Merrimack County[permanent dead link]
- Town of Boscawen, Merrimack County
- City of Franklin, Merrimack County
- Town of Tilton, Belknap County
- Town of Belmont, Belknap County
- City of Laconia, Belknap County
- Town of Gilford, Belknap County
- Town of Meredith, Belknap County
- Town of Center Harbor, Belknap County
- Town of Holderness, Grafton County
- Town of Ashland, Grafton County
- Town of Plymouth, Grafton County
- Town of Campton, Grafton County
- Town of Thornton, Grafton County
- Town of Woodstock, Grafton County
- Town of Lincoln, Grafton County
- Town of Franconia, Grafton County
- Town of Carroll, Coos County[permanent dead link]
- Town of Whitefield, Coos County
- Town of Northumberland, Coos County
- Town of Stratford, Coos County
- Town of Colebrook, Coos County
- Town of Pittsburg, Coos County
- Planning Division (2012). "Massachusetts Highway Route Log". Massachusetts Department of Transportation. Retrieved February 2, 2017.
- "US 3 Exit Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 24, 2019.
- "I-95 Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
|Wikimedia Commons has media related to U.S. Route 3.|
- US 3/Northwest Expressway on Bostonroads.com
- Photos of US 3 in New Hampshire
- Endpoints of U.S. Highway 3
|Browse numbered routes|
|← Route 2A||MA||→ Route 3|
|← US 2||NH||→ NH 3A|
|← Route 5||N.E.||→ Route 6A|