Memphis, Tennessee

Memphis was an American city.

Henry van Statten ordered Polkowski taken away, his memory wiped and his body dumped in Memphis or "somewhere beginning with M." (TV: Dalek)

The Eighth Doctor claimed to have picked up his musical pitch in Memphis. (AUDIO: Scaredy Cat)

Behind the scenes
Nevertheless, Dalek does not in any way suggest that Memphis might be in Tennessee, which this map clearly shows. Still, as a point of distinction from Memphis, Egypt, we add "Tennessee" as the most obvious way to help us distinguish between the two.