Seattle

Seattle was an American city.

In 2012, Seattle was one of the cities suggested by Diana Goddard to leave Henry van Statten after she ordered for him to be taken away, his memory wiped, and dumped "someplace beginning with S." (TV: Dalek)

The Doctor had two friends in Seattle, old ladies who spent most of their time gossiping about their neighbours. (PROSE: Business Unusual)

Alan and Maria Jackson were late for their plane to Sarah Jane Smith's memorial because they were busy chasing a Bandril through the streets of Seattle. (WC: Farewell, Sarah Jane)

Behind the scenes
Nevertheless, Dalek does not in any way suggest that Seattle might be in Washington state, which this map clearly shows.