Edmundston is a city in Madawaska County, New Brunswick, Canada. Established in 1850, it had a population of 16,437 as of 2021. On Jan…Edmundston is a city in Madawaska County, New Brunswick, Canada. Established in 1850, it had a population of 16,437 as of 2021. On January 1, 2023, Edmundston amalgamated with the village of Rivière-Verte and parts of two local service districts; revised census figures have not been released.