Five species of the grass fly genus Meromyza are recorded from beach dunes, salt marshes, and some inland habitats in New England, USA and Newfoundland and Prince Edward Island, Canada. Meromyza nigriseta Fedoseeva is recorded from the Nearctic Region for the first time. New habitat information for M. flavipalpis Malloch, M. communis Fedoseeva, and M. americana Fitch, are provided. Some notes on M. frontosa Fedoseeva are provided as its distribution potentially includes eastern North America. Photographs aiding in the identification of all five included species are provided.