of the Montérégie parishes were taken from the territory of the canonical Diocese of Saint-Jean-Longueuil. Subregions The Montérégie has three administrative subregions, each consisting of its own regional county municipalities (RCM) or equivalent territories. The territorial administration of the region was conducted by three regional conferences of elected officers () (CRE) separate and independent in their territory: Longueuil, Montérégie-Est (eastern RCMs) and Vallée-du-Haut-Saint-Laurent (western RCMs). Each sub-region was organized in the same way as other administrative regions of Quebec. Regional county municipalities There are 14 regional county municipalities in Montérégie. In 2021, Brome-Missisquoi and La Haute-Yamaska transferred to Estrie. Montérégie-Est As of 2021, there are seven RCMs in Montérégie Est. Its seat is McMasterville, and the president is Arthur Fauteux. Its territory occupies and there are 656,287 inhabitants, with a population density of 92.1/km2 (238.6/sq mi). Vallée-du-Haut-Saint-Laurent There are five RCMs in Vallée-du-Haut-Saint-Laurent. Its seat is Salaberry-de-Valleyfield, and its president is Yves Daoust. Its territory occupies and there are 435,436 inhabitants, with a population density of 116.8/km2 (302.6/sq mi). Equivalent territory Native Reserves The population of both of these reserves are majority-Mohawk, one of the historic Five Nations of the Haudenosaunee, or Iroquois League. Kahnawake was established south of Montreal in 1719 as a mission village. Akwesasne was established upriver by Mohawk leaders and their families in the mid-18th century, accompanied by French Jesuit missionaries. Akwesasne spans the boundaries of Canada and the United States, extending across the St. Lawrence River into New York State, where it is referred to as the St. Regis Reservation. Akwesasne Kahnawake Major communities Beloeil Boucherville Brossard Candiac Chambly Châteauguay La PrairieLongueuil Mont-Saint-Hilaire Saint-Bruno-de-Montarville Saint-Constant Saint-Hyacinthe Saint-Jean-sur-Richelieu Saint-LambertSaint-Lazare Sainte-Catherine Sainte-Julie Salaberry-de-Valleyfield Sorel-Tracy Varennes Vaudreuil-Dorion References External links Portail régional de la Montérégie Official website Site officiel de la CRÉ de Longueuil Site officiel de la CRÉ de la Montérégie-Est Site officiel de la CRÉ de la Vallée-du-Haut-Saint-Laurent Agence de la santé et des services sociaux de la Montérégie Administrative regions of Quebec