In the 2021 Census of Population conducted by Statistics Canada, Port Kirwan had a population of 49 living in 30 of its 53 total private dwellings, a change of -5.8% from its 2016 population of 52. With a land area of 8.84 km2 (3.41 sq mi), it had a population density of 5.5/km2 (14.4/sq mi) in 2021.[1]