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

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Coaticook
Regional county municipality
Coordinates: 45°08′N 71°48′W[1]
Country	Canada
Province	Quebec
Region	Estrie
Effective	January 1, 1982
County seat	Coaticook
Government [2]
• Type	Prefecture
• Prefect	Réjean Masson
Area [2][3]
• Total	1,354.70 km2 (523.05 sq mi)
• Land	1,339.80 km2 (517.30 sq mi)
Population  (2016)[3]
• Total	18,497
• Density	13.8/km2 (36/sq mi)
• Change 2011-2016	1.9%
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Area code	819
Website	www.mrcdecoaticook.qc.ca
[4]

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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.^[5][6]

There are 12 subdivisions within the RCM:^[2]

Mother tongue data from Canada 2016 Census^[3]

• List of regional county municipalities and equivalent territories in Quebec