Mayer is a city in Carver County, Minnesota, along the South Fork of the Crow River. The population was 1,749 at the 2010 census.
According to the United States Census Bureau, the city has a total area of 1.0 square miles (2.5 km²), of which, 1.0 square miles (2.5 km²) of it is land and 1.02% is water. State Highway 25 serves as a main route in the community. State Highway 7 is in close proximity to the city.
As of the census of 2000, there were 554 people, 200 households, and 147 families residing in the city. The population density was 572.0 people per square mile (220.5/km²). There were 205 housing units at an average density of 211.7 per square mile (81.6/km²). The racial makeup of the city was 98.56% White, 0.90% Asian, 0.54% from other races. Hispanic or Latino of any race were 2.17% of the population.