Montmagny (French pronunciation: [mɔ̃maɲi]) is a city in the Montmagny Regional County Municipality within the Chaudière-Appalaches region of Quebec. It is the county seat and had a population, as of the Canada 2021 Census, of 10,999.

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Montmagny
City
Saint Thomas Church
Location within Montmagny RCM.
Montmagny Location in province of Quebec.
Coordinates: 46°59′N 70°33′W[1]
Country	Canada
Province	Quebec
Region	Chaudière-Appalaches
RCM	Montmagny
Constituted	April 2, 1966
Government [2]
• Mayor	Marc Laurin
• Federal riding	Montmagny—L'Islet— Kamouraska—Rivière- du-Loup
• Prov. riding	Côte-du-Sud
Area [2][3]
• Total	145.00 km2 (55.98 sq mi)
• Land	124.44 km2 (48.05 sq mi)
Population  (2021)[3]
• Total	10,999
• Density	88.4/km2 (229/sq mi)
• Pop 2016-2021	2.3%
• Dwellings	5,801
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Postal code(s)	G5V
Area code(s)	418 and 581
Highways A-20 (TCH)	R-132 R-228 R-283
Website	www.ville. montmagny.qc.ca

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The city is on the south shore of the Saint Lawrence River, east of Quebec City, and was founded more than 350 years ago. It is Canada's Snow Goose Capital, and festivals include the International Accordion Festival in September and the Festival of the Snow Geese in October.

The city was named after Charles de Montmagny, the first to have the title of governor of New France; Samuel de Champlain was commander in chief.

Montmagny was the county seat of the former Montmagny County.

Montmagny is northwest of the Notre Dame Mountains, more commonly but unofficially called the Canadian extension of the Green Mountains as they are called in New England. While Mont Notre Dame is the official name, the vast majority of people living in the area stretching from Quebec City to the Gaspé Peninsula refer to them as simply "the Appalachians" (French: les Appalaches), the origin of the official designation of the region comprising Quebec City's South Shore suburbia to the US border to the east and the northeast, which is known as Chaudière-Appalaches, after the mountains and the main river flowing down from them into the St. Lawrence River

The city of Montmagny itself is divided by the South River (French: Rivière du Sud), where a smaller river, Bras-Saint-Nicolas, merges into it. The confluence of waters swells into a set of falls, leading to discharge into the Saint-Lawrence a short distance west of the city.

Montmagny is the seat of the judicial district of Montmagny. ^[4]

Researchers have studied the intertidal marshes of the St. Lawrence estuary at Montmagny.^[5]

In the 2021 Census of Population conducted by Statistics Canada, Montmagny had a population of 10,999 living in 5,464 of its 5,801 total private dwellings, a change of -2.3% from its 2016 population of 11,255. With a land area of 124.44 km² (48.05 sq mi), it had a population density of 88.4/km² (228.9/sq mi) in 2021.^[7]

This section does not cite any sources. (August 2017)

The industrial sector is the backbone of the economy. However, the city lost many jobs when Whirlpool closed its activities on May 13, 2004, incurring the loss of 600 jobs. The city has rebounded from that period. Textile industry has also made employment for decades. A post-secondary institution, The Centre d'études collégiales de Montmagny, a hospital, named Hôtel-Dieu de Montmagny, and a provincial jail are part of the economy.

• Amable Bélanger, iron founder
• Sammy Blais, professional ice hockey left winger
• Gérard Bolduc, founder of the Quebec International Pee-Wee Hockey Tournament
• Alain Côté, ice and roller hockey player
• Sylvie Garant, model, Playboy Playmate of the Month for November 1979
• Étienne-Paschal Taché, twice Premier of the Province of Canada, President of the Quebec Conference, 1864, considered a Father of Confederation
• Emma Gaudreau Casgrain, first woman to be licensed as a dentist in Canada