The Municipality has a population of 2,300 permanent residents. Markstay-Warren is a bilingual municipality where the use of the French language is predominent in relation to the use of English.
Fluctuation in population - besides farm land, the municipality has many lakes, lush forests, the Veuve River and some smaller water courses within its boundaries. This has resulted in the development of cottages, hunting and fishing camps, as well as tourist lodges. Consequently there is an increase in the population during the tourist seasons. With the popularity of snowmobiles and the development of snowmobile trails throughout the municipality, we also see a seasonal population increase during the winter months.
Although the ages of the population reflect those of other municipalities, migration of retired persons to our municipality from the larger centres has resulted in an increase in the senior population.