Saint-Casimir is a municipality of about 1800 people in the Portneuf Regional County Municipality in the province of Quebec, Canada. It is located on the Sainte-Anne River, about 80 kilometres southwest of Quebec City and 50 kilometres northeast of Trois-Rivières. It was founded in 1836 by people who came from Ste-Anne-de-la-Pérade following t…Saint-Casimir is a municipality of about 1800 people in the Portneuf Regional County Municipality in the province of Quebec, Canada. It is located on the Sainte-Anne River, about 80 kilometres southwest of Quebec City and 50 kilometres northeast of Trois-Rivières. It was founded in 1836 by people who came from Ste-Anne-de-la-Pérade following to the east along the Sainte-Anne.