Lexington is a city in Anoka County, Minnesota, United States, and is a northern suburb of the Twin Cities metropolitan area. The population …Lexington is a city in Anoka County, Minnesota, United States, and is a northern suburb of the Twin Cities metropolitan area. The population was 2,248 at the 2020 census. According to the United States Census Bureau, the city has a total area of 0.69 square miles, all land.