It is located entirely in Franklin County and runs between Weld and the Chesterville village of Farmington Falls.

The road generally follows Wilson Stream whilst passing homes and a small factory before heading towards another business district in the town.

The road climbs a small hill passing a cemetery and some churches before intersecting SR 133 at the hamlet of Beans Corner.

At Wilton Road, SR 156 turns to the northwest to cross Wilson Stream and enter Farmington again.

SR 156 turns to the east, crosses Wilson Stream one last time and re-enters Chesterville at the hamlet of Farmington Falls.