Richfield, Minnesota. Richfield is a city in Hennepin County, Minnesota, United States. An inner-ring suburb of the Minneapolis–Saint Paul region, it is bordered by Minneapolis to the north, Minneapolis–Saint Paul International Airport to the east, Bloomington to the south, and Edina to the west. Best Buy, the U.S.'s largest electronics retailer, has its headquarters in Richfield. The population was 35,228 at the 2010 census.