Long Harbour–Mount Arlington Heights is a town in the Canadian province of Newfoundland and Labrador.

The town had a population of 185 in the Canada 2021 Census.

The town is the site of the Long Harbour Nickel Processing Plant.

[1] In the 2021 Census of Population conducted by Statistics Canada, Long Harbour-Mount Arlington Heights had a population of 185 living in 97 of its 167 total private dwellings, a change of -26% from its 2016 population of 250.

This Newfoundland and Labrador location article is a stub.