Biscay is a city in McLeod County, Minnesota, United States. The population was 113 at the 2020 census. A post office called Biscay w…Biscay is a city in McLeod County, Minnesota, United States. The population was 113 at the 2020 census. A post office called Biscay was established in 1888, and remained in operation until 1954. The city was named after the Bay of Biscay on the Atlantic Ocean.