U.S. Route 4 in New Hampshire

US 4 crosses the Connecticut River into New Hampshire in the community of West Lebanon, where it immediately intersects New Hampshire Route 10 (NH 10) which runs parallel to the river. US 4 turns south onto NH 10, and the two routes turn south, meeting NH 12A before turning toward and interchanging with Interstate 89 (I-89). At this point, NH 10 joins the I-89 freeway southbound, while US 4 continues east into downtown Lebanon. The road crosses NH 120, continues east, and interchanges with I-89/NH 10 again. US 4 continues east away from the freeway near Mascoma Lake, where NH 4A splits off to the southeast. US 4 continues east through Enfield and into Canaan, where it meets the southern end of NH 118. The road turns to the south at this point, passing through Grafton and Danbury, where US 4 meets the west end of NH 104 and continues south into Andover. In Andover, US 4 turns back to the east and meets NH 11 near NH 4A's eastern terminus. US 4 and NH 11 run concurrently through Andover for about two miles (3.2 km) before splitting, NH 11 to the northeast and US 4 to the southeast. US 4 enters the town of Salisbury and crosses NH 127, before continuing into Boscawen and intersecting with US 3. US 3 and US 4 share a short concurrency (about a mile [1.6 km]), before US 4 turns east to interchange with I-93 at Exit 17.

US 4 joins I-93 southbound and runs along the freeway until exit 15E in Concord. At this interchange, US 4 leaves I-93 and joins I-393 and US 202 which run eastbound out of the city. The two U.S. Routes overlap I-393 to its terminus in the northern corner of Pembroke. I-393 then ends, and US 4/US 202 merge onto NH 9 eastbound through Chichester and into Epsom. The road crosses NH 28 at the Epsom Traffic Circle, then continues east and intersects NH 107, forming a two-mile-long (3.2 km) four-route concurrency into Northwood, where NH 107 splits off to the northwest. US 4, US 202, and NH 9 continue through Northwood, and US 202 and NH 9 split from US 4 at an intersection with NH 43.

US 4 continues east, meeting the west end of NH 152 and proceeding into Nottingham and then into Lee, where US 4 meets NH 125 at a two-lane roundabout. After leaving this interchange, US 4 crosses into Durham and becomes a semi-limited-access highway. US 4 has a partial eastbound interchange with NH 155 and a diamond interchange with NH 155A down the road, providing access to the University of New Hampshire campus in Durham. US 4 has one more interchange, with NH 108, before becoming a full-access highway again. US 4 continues east toward the coast and crosses the tidal Bellamy River to enter Dover, then interchanges with the Spaulding Turnpike (NH 16). US 4 joins the turnpike southbound, closely paralleling the Maine state border and crossing the Little Bay Bridge into the town of Newington before continuing into the city of Portsmouth. US 4 terminates just south of the Maine state line at the final southbound interchange with I-95, where the turnpike splits to merge with I-95 south, and NH 16 continues south to end at the Portsmouth Traffic Circle, providing access to I-95 north and US 1 Bypass.

The section of US 4 from the Vermont state line to Andover (and NH 11 from Andover to Franklin) was first numbered in 1925 as an eastern extension of Route 14. From Franklin to Concord, the road was designated as Route 6 (now US 3), and, from Concord to Northwood, it was Route 9 (now NH 9). Between Northwood and Dover, the road was previously not numbered. From Dover to its eastern terminus at Portsmouth, the road used part of Route 16 (now NH 16).

Exit numbers listed are those of the primary highway with which US 4 is concurrent.

County	Location[2][3]	mi[2][3]	km	Exit	Destinations	Notes
Grafton	Lebanon	0.000	0.000		US 4 west (Bridge Street) to US 5 / VT 14 – White River Junction	Continuation into Vermont
		0.247	0.398		NH 10 north (North Main Street) – Hanover	Western end of concurrency with NH 10
		0.587	0.945		NH 12A south (South Main Street)	Northern terminus of NH 12A
		2.230	3.589		I-89 / NH 10 south – Enfield, Concord, Vermont	Exit 19 on I-89; eastern end of concurrency with NH 10
		3.811– 3.934	6.133– 6.331		NH 120 (Hanover Street / School Street) – Hanover, Meriden, Claremont
		6.091	9.803		I-89 / NH 10 – Grantham, Concord, Lebanon, Hanover, Vermont	Exit 17 on I-89 / NH 10
		7.858	12.646		NH 4A south – Enfield Center, Andover	Northern terminus of NH 4A
	Canaan	17.695	28.477		NH 118 north (Dorchester Road) – Dorchester, Rumney	Southern terminus of NH 118
Merrimack	Danbury	31.624	50.894		NH 104 east (Ragged Mountain Highway) – Bristol	Western terminus of NH 104
	Andover	38.639	62.183		NH 11 west (Main Street) – New London	Western end of concurrency with NH 11
		41.401	66.628		NH 11 east (Franklin Highway) – Franklin	Eastern end of concurrency with NH 11
	Salisbury	47.442	76.350		NH 127 (South Road / Franklin Road) – Webster, Franklin
	Boscawen	53.880	86.711		US 3 north (Daniel Webster Highway) – Franklin	Western end of concurrency with US 3
		55.155	88.763		US 3 south (North Main Street) – Penacook	Eastern end of concurrency with US 3
	Concord	57.937	93.241		I-93 north (Styles Bridges Highway) – Tilton, Plymouth Hoit Road To NH 132	Exit 17 on I-93; western end of concurrency with I-93
		61.233	98.545	16	NH 132 (East Side Drive) – East Concord	Via West Portsmouth St.
		63.413	102.053		I-93 south (Styles Bridges Highway) to I-89 – Manchester, Lebanon I-393 east / US 202 to US 3 (North Main Street) – Downtown	Exit 15 on I-93; eastern end of concurrency with I-93 Western terminus of I-393; western end of concurrency with I-393 / US 202 concurrency
		63.670	102.467	1	Fort Eddy Road – NHTI Community College
		63.965	102.942	Veterans Memorial Bridge over the Merrimack River
		64.730	104.173	2	NH 132 (East Side Drive)
		66.557	107.113	3	NH 106 (Sheep Davis Road) to NH 9 – Laconia, Pembroke
	Pembroke	68.008	109.448		I-393 west / NH 9 west – Concord Hgts. Business District	Eastern terminus of I-393 and its concurrency with US 4; western end of concurrency with NH 9; westbound exit and eastbound entrance
	Epsom	73.088	117.624		NH 28 (Suncook Valley Highway) – Pittsfield, Allenstown	Traffic circle
		76.748	123.514		NH 107 south – Deerfield, Raymond	Western end of concurrency with NH 107
Rockingham	Northwood	78.657	126.586		NH 107 north (School Street) – Pittsfield	Eastern end of concurrency with NH 107
		84.501	135.991		US 202 east / NH 9 east (Rochester Road) / NH 43 south (Mountain Avenue) – Dover, Rochester, Deerfield, Candia	Eastern end of concurrency with US 202 / NH 9; northern terminus of NH 43
		85.163	137.057		NH 152 east (Nottingham Road) – Nottingham, Lee	Western terminus of NH 152
Strafford	Lee	92.597	149.020		NH 125 (Calef Highway) – Epping, Kingston, Manchester, Barrington, Rochester	Roundabout
		93.968	151.227		NH 155 (Turtle Pond Road) – Lee, Madbury	Eastbound exit and westbound entrance
	Durham	95.292	153.358		NH 155A (Main Street) – Durham, Lee	Interchange
		98.325	158.239		NH 108 (Dover Road) – Durham, Dover, Newmarket	Interchange
	Dover	102.525	164.998		Spaulding Turnpike north / NH 16 north – Somersworth, Rochester, Conway	Exit 6 on Spaulding Turnpike; western end of concurrency with Spaulding Turnpike. Full-access interchange opened on Friday, 15 November 2019.[4]
Rockingham	Newington	103.67	166.84	4	Shattuck Way – Newington Village
		104.20	167.69	3	Woodbury Avenue
	Newington–Portsmouth line	105.325	169.504	1	Gosling Road (Pease Tradeport; Portsmouth Intl. Airport)
	Portsmouth	106.83	171.93		I-95 / Spaulding Turnpike ends / NH 16 ends / US 1 Byp. – Hampton, Boston, Portsmouth, Maine Points	Portsmouth Circle; eastern terminus of US 4 and southern terminus of the Spaulding Turnpike / NH 16; I-95 Exits 4–5
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

• US 4 Alt.: Andover to Boscawen
• US 4 Byp.: Concord
• US 4 Alt.: East Northwood to Dover

NH 4A entering Sullivan County

New Hampshire Route 4A (NH 4A) is a 24-mile-long (39 km) route between Lebanon and Andover, New Hampshire, serving as a shortcut around several villages on US 4. Until I-89 was built in the early 1970s, this was part of the main route between the Lebanon–Hanover area and the southeastern portion of New Hampshire. Today, traffic is very light on this road.

NH 4A is signed as a north–south highway, although its orientation is more southeast–northwest. The northern terminus is in Lebanon at US 4, near the western tip of Lake Mascoma. The southern terminus is in the town of Andover at NH 11, about 0.75 miles (1.21 km) southwest of its intersection with US 4. This highway is locally named the 4th New Hampshire Turnpike.

NH 4A is an alternate route of US 4, and not of NH 4, a completely different route located in Dover.

• New Hampshire Historical Marker No. 165: The Alexander Scammell Bridge over the Bellamy River
• New Hampshire Historical Marker No. 181: First New Hampshire Turnpike

• Berg, Matt (July 17, 2020). "Major N.H. road to close for 5 days during bridge repairs". The Boston Globe. Retrieved July 17, 2020.

• U.S. Route 4 in New Hampshire on Flickr
• New Hampshire State Route 4A on Flickr