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.
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.
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]
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.