Coaticook is a regional county municipality in the Estrie region of Quebec, Canada.

The seat is Coaticook.

On September 3, 1783, as a result of the signing of the Treaty of Paris the American Revolutionary War ended with Great Britain.

Quebec's border with the states of Vermont and New Hampshire was established at 45 degrees north latitude.

Mother tongue data from Canada 2016 Census[3] Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[7]