La Haute-Yamaska Regional County Municipality

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La Haute-Yamaska
Regional county municipality
Location of La Haute-Yamaska
Coordinates: 45°24′N 72°44′W / 45.400°N 72.733°W / 45.400; -72.733Coordinates: 45°24′N 72°44′W / 45.400°N 72.733°W / 45.400; -72.733[1]
Country  Canada
Province  Quebec
Region Montérégie
Effective March 3, 1982
County seat Granby
 • Type Prefecture
 • Prefect Pascal Russell
 • Total 650.40 km2 (251.12 sq mi)
 • Land 636.64 km2 (245.81 sq mi)
Population (2011)[3]
 • Total 85,042
 • Density 133.6/km2 (346/sq mi)
 • Pop 2006-2011 Increase 7.2%
 • Dwellings 38,099
Time zone EST (UTC−5)
 • Summer (DST) EDT (UTC−4)
Area code(s) 450 and 579

La Haute-Yamaska (meaning The Upper Yamaska) is a regional county municipality in the Montérégie region of Quebec, Canada. Its seat is Granby.

It is named for its position at the height of the Yamaska River, which cuts through its southern part. It rises at Brome Lake located in neighbouring Brome-Missisquoi Regional County Municipality.

On January 1, 2010, the city of Bromont left La Haute-Yamaska; it was reclassified as within the Brome-Missisquoi RCM.[4]


There are 8 subdivisions within the RCM:[2]


Mother tongue language from Canada 2006 Census

Language Population Pct (%)
French only 77,965 93.16%
English only 3,140 3.75%
Both English and French 350 0.42%
Other languages 2,235 2.67%


Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[5]