Rochester International Airport is an international airport located seven miles south of downtown Rochester in Olmsted County, Minnesota. It is the second-busiest airport in Minnesota. Its name used to be "Rochester Municipal Airport", before adding customs and immigration facilities specifically for Mayo Clinic purposes in 1995. The airport covers 2,400 acres and has two concrete runways: 9,034 ft × 150 ft runway 13/31 and 7,301 ft × 150 ft runway 2/20.