Minneapolis was an American city.
In 2012, Minneapolis was one of the cities suggested by Henry van Statten to leave Polkowski after he ordered for him to be taken away, his memory wiped, and dumped "somewhere beginning with M." (TV: Dalek)
Real world location
Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map at right is probably a good indicator of the DWU location of Minneapolis.
Nevertheless, neither Dalek nor any other DWU story ever mentions the state of Minnesota, which this map clearly shows as the location for Minneapolis.