Spoiler warning: Plot and/or ending details follow.
Over the course of the 1850s and 1860s, Aaron Stemple, a local sawmill owner, purchased a number of small lots in Seattle. By the end of the 1860s, he had been made a member of the first school board, and elected mayor of the town. (TOS novel: Ishmael)
While training with Gabriel Lorca in 2256, Ash Tyler claimed to be from Seattle. When Tyler mentioned that his mother taught at Issaquah Elementary, a 24 kilometer distance from the city, Lorca indicated that he did't think this meant Tyler was truly from Seattle. (DSC episode: "Lethe", ST website: Startrek.com)