Leech, New BrunswickLeech is an unincorporated place in New Brunswick, Canada. It is recognized as a designated place by Statistics Canada.DemographicsIn the 2021 Census of Population conducted by Statistics Canada, Leech had a population of 635 living in 263 of its 284 total private dwellings, a change of from its 2016 population of 608. With a land area of, it had a population density of in 2021.