Huntingdon County is an historical county in southwestern Quebec, Canada. It is named after the town and county of the same name (Huntingdon, Huntingdonshire) in east central England. It is situated in the Montreal South Shore region of Montérégie, one of the roughly 12 regions of Quebec. The county was bounded entirely on its south by the Canada–US border (45° N for 88.75 km from 73°32′ W to 74°40′ W), along its northwestern flank by Lake St-Francis (Lac St-François) of the Saint Lawrence River to its most northern point on the river at 45°13′ N and 74°13′ W, to the east by Saint-Jean County, with its easternmost point at 45°5.5' N and 73°31′ W (this point forms the junction of the borders of Châteauguay County, Napierville County and Saint-Jean County) and to the north from east to west