Mayer is a community in Carver County, Minnesota, United States, along the South Fork of the Crow River. The population was 1,749 at the 2…Mayer is a community in Carver County, Minnesota, United States, along the South Fork of the Crow River. The population was 1,749 at the 2010 census. A post office was first established in Helvetia in 1875, and the name was changed to Mayer in 1888. The name Mayer was given it by railroad officials.