The shape of Hart's Location is unusual: about long and wide, with crooked boundaries that echo the confines of Crawford Notch, threaded by the upper Saco River and U.S. Route 302 near the centerline of the town, and pinched from both sides between steep mountains and in some areas sheer cliffs above. This anomaly is heightened on maps that show county lines: Coos County lies immediately to the east and Grafton County to the west, but Hart's Location is part of Carroll County, though barely connected to it.