Castor River South, Newfoundland and LabradorCastor River South is a local service district and designated place in the Canadian province of Newfoundland and Labrador.GeographyCastor River South is in Newfoundland within Subdivision C of Division No. 9.DemographicsAs a designated place in the 2016 Census of Population conducted by Statistics Canada, Castor River South recorded a population of 136 living in 50 of its 56 total private dwellings, a change of from its 2011 population of 141. With a land area of, it had a population density of in 2016.GovernmentCastor River South is a local service district that is governed by a committee responsible for the provision of certain services to the community. The chair of the LSD committee is Gerard Rumbolt.