Cornish is a town in York County, Maine, United States. The population was 1,508 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. The main village in town is the Cornish census-designated place. The village has a number of antique shops and restaurants near historic Thompson Park. Corni…Cornish is a town in York County, Maine, United States. The population was 1,508 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. The main village in town is the Cornish census-designated place. The village has a number of antique shops and restaurants near historic Thompson Park. Cornish is home to the first concrete bridge in North America.