MileCheckNew Hampshire packs a lot of road character into a small state — the shortest ocean coastline of any coastal state, and an interstate that squeezes down to two lanes through a mountain notch. Here's how its mile markers work, where they matter most, and how to see your exact one plus live road alerts in real time.
How New Hampshire numbers its highways
New Hampshire's mileposts count up from the south, starting at the Massachusetts line, and rise as you head north toward Vermont and the White Mountains. One thing that stands out: NHDOT posts markers at 0.2-mile intervals on major routes, so on the interstates you're rarely more than a few hundred yards from a posted number. Mile marker data for every New Hampshire highway is bundled into MileCheck and works offline.
The corridors people actually drive
- I-93 is the state's spine — up from the Massachusetts line through Manchester and Concord, then north into the White Mountains and Franconia Notch to the Vermont line, about 131 miles.
- I-95 crosses New Hampshire's famous 18-mile sliver of seacoast — the shortest interstate coastline in the country — past Portsmouth between Massachusetts and Maine.
- I-89 cuts northwest from Concord toward Lebanon and the Vermont line.
- US-3 shadows I-93 the whole way and keeps going north where the interstate ends, and US-302 threads Crawford Notch through the mountains.
Where mile markers matter most: Franconia Notch
Around mile marker 105, I-93 does something almost no other interstate does: it narrows to a two-lane parkway, one lane each way, squeezed through Franconia Notch between the mountains. It's a beautiful stretch and a demanding one — weather rolls in fast, there's little shoulder, and when something blocks the road there's no easy way around. Crash reports and closures through the Notch are given by mile marker, and knowing yours is how you make sense of them.
White Mountain weather
North of Concord, the road climbs and the weather changes fast. Snow squalls, black ice, and high wind can hit I-93 and US-302 through the notches while the seacoast stays dry. Winter closures and chain-ups in the mountains are announced by route and milepost, and the difference between "closed at MP 100" and "closed at MP 110" can be the difference between turning around at Lincoln or getting stuck behind it.
Live New Hampshire alerts, in one place
MileCheck pulls live road alerts for New Hampshire — closures, crashes, and construction — tied to the mile marker and route so you can see what's ahead of you before you commit to the Notch. Alerts refresh in real time, and the mile marker data underneath works offline where the mountains eat your signal.
Everyday and emergency
Whether you're timing a ski-weekend run up I-93, reporting a breakdown on the seacoast stretch of I-95, or telling a friend where to meet on US-3, the mile marker is the location New Hampshire's roads run on. MileCheck shows yours in real time, down to a tenth of a mile, with CarPlay and Android Auto for the drive north.
Keep reading
Nearby state guides: Maine · Massachusetts · Vermont
New Hampshire drawbridges: every movable bridge, its opening rules →
Essentials: What to tell 911 on the highway · How to find your mile marker · Browse the live mile marker map · All 50 states