Back in the early 1950s, Albert Einstein convinced President Truman to establish a town for all of its greatest scientific minds where they could work in seclusion, secrecy, and high security (triple sec!), and yet still maintain the semblance of a small-town home life.
And that's how 'Eureka', Oregon, was founded.
Harry Truman was probably receptive to the idea because he had seen first-hand the threat posed by the Hive just a few years before in Roswell, New Mexico. The oversight committee working behind the scenes to battle the alien menace was known as Majestic 12 (as seen on 'Dark Skies'), and they probably were responsible for the establishment of 'Eureka'.