- Direction:
- East/West
- Western Terminus:
- Chesterfield Road (VT 9) at the Vermont-New Hampshire state line
- Eastern Terminus:
- Saw Mill Hill (ME 9) at the New Hampshire-Maine state line
- Distance:
- 109.92 miles
- Counties:
- Cheshire, Hillsborough, Merrimack, Rockingham, Strafford
- Signed:
- Yes
NH 9 is the southernmost east/west route crossing New Hampshire between Vermont and Maine. It is known as the Franklin Pierce Highway in memory of the fourteenth president of the United States, although it also has local names in many areas.
Chesterfield Road (VT 9) becomes NH 9 upon crossing a bridge over the Connecticut River from Vermont to New Hampshire. It runs east to the western terminus of NH 101 in Keene, where it turns north and is joined by NH 10 and NH 12. The three routes are multiplexed as a super-2, a two-lane undivided highway with grade-separated interchanges. After a short distance, NH 12 and then NH 10 splits off to the north. NH 9 runs northeast as a surface road to Hillsborough, where it joins US 202 and becomes a super-2 once again. The super-2 ends at an interchange with I-89 in Hopkinton. US 202/NH 9 continues east to Concord.
In Concord, the two routes split briefly. US 202 follows I-393, while NH 9 follows Loudon Road and provides a local alternative to the interstate. At the eastern terminus of I-393, US 202 and NH 9 come back together and runs east to Barrington, where they split. NH 9 continues east to Dover and then northeast to Somersworth, where it crosses the Salmon Falls River into Maine and becomes ME 9.
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