St. Isidore (formerly known as St. Isidore de Prescott) is a community in The Nation Municipality in Prescott and Russell County in Ontario, Canada. The town was originally called St. Isidore de Prescott, but in 1989, when the community became an incorporated village, the name was shortened to St. Isidore. However, the incorporated village was short-lived and became part of The Nation Municipality nine years later in 1998. St-Isidore has a French elementary school (Kindergarten to 6) called L'école Catholique de St-Isidore . The school has between 200 and 300 students.