New Hampshire Route 12

New Hampshire Route 12
Map of western New Hampshire with NH 12 highlighted in red
Route information
Maintained by NHDOT
Length	62.773 mi[1] (101.023 km)
Major junctions
South end	Route 12 in Winchendon, MA
Major intersections	NH 9 / NH 10 / NH 101 in Keene
North end	VT 12 in Ascutney, VT
Location
Country	United States
State	New Hampshire
Counties	Cheshire, Sullivan
Highway system
New Hampshire Highway System Interstate US State Turnpikes
← NH 11 → NH 13
← Route 11 N.E. → Route 12A

New Hampshire Route 12 is a 62.773-mile (101.023 km) long north–south state highway in southwestern New Hampshire. Its southern terminus is at the Massachusetts state line in Fitzwilliam, where it continues south as Massachusetts Route 12. Its northern terminus is at the Vermont state line in Claremont (a terminus it shares with New Hampshire Route 103), where it continues north as Vermont Route 12. Most of the northern part of NH 12 runs along the Connecticut River.

Its number is derived from its original 1922 designation as New England Interstate Route 12 (also known as the "Keene Way"). Present-day Vermont Route 12, New Hampshire Route 12, Massachusetts Route 12 and Connecticut Route 12 still mostly follow the original route. The 283.3-mile (455.9 km) four-state series of State Route 12s extend from Morrisville, Vermont, to Groton, Connecticut.