List of U.S. Routes in New Hampshire
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| United States Numbered Highways of the New Hampshire Highway System | |
|---|---|
x70px
Highway marker for U.S. Routes 3 and 202
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| System information | |
| Formed: | November 11, 1926[1] |
| Highway names | |
| US Routes: | U.S. Route nn (US nn) |
| Special Routes: | U.S. Route nn Business (US nn Bus.); U.S. Route nn Bypass (US nn Byp.) |
| System links | |
The U.S. Highways in New Hampshire comprise six current and one former United States Numbered Highway in New Hampshire. There are three additional highway designations for pair of business routes and a bypass, and there were two other bypasses and a fourth business loop in the past.
Mainline highways
| Number | Length (mi)[2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
| x25px US 1 | 17.044 | 27.430 | US 1 at Seabrook | US 1 at Portsmouth | 1926 | current | ||
| x25px US 2 | 35.437 | 57.030 | — | — | 1926 | current | ||
| x25px US 3 | 241.953 | 389.386 | US 3 at Nashua | Route 257 at Pittsburg | 1926 | current | ||
| x25px US 4 | 106.83 | 171.93 | US 4 at Lebanon | I-95/US 1 Byp. in Portsmouth | 1926 | current | ||
| x25px US 5 | — | — | — | — | 1927 | 1929 | ||
 US 202 |
95.270 | 153.322 | US 202 at Rindge | US 202 at Rochester | 1935 | current | ||
 US 302 |
79.155 | 127.388 | US 302 at Haverhill | US 302 at Conway | 1935 | current | ||
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Special routes
| Number | Length (mi)[2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
| x25px US 1 Byp. | 2.756 | 4.435 | US 1 in Portsmouth | US 1 Byp. at Portsmouth | — | — | Highway continues into Maine | |
 x25px US 3 Bus. |
4.144 | 6.669 | US 3 & NH 11 in Belmont | US 3 in Laconia | — | — | Unsigned, concurrent with NH 107 and NH 11A | |
x25px US 3 Bus. |
— | — | — | — | — | — | ||
  US 3 Byp. |
— | — | — | — | — | — | ||
| US 3 Byp. |
— | — | — | — | — | — | ||
| US 302 Bus. |
2.49 | 4.01 | US 3/NH 16 in Bartlett | US 302/NH 16 in Bartlett | — | — | Unsigned, concurrent with NH 16A | |
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