It was generated manually. I made another list just now[1], here are the areas with more than one posting:

    SFBA: 146
    NYC: 57
    Boston: 20
    LA: 20
    Seattle: 11
    DC: 10
    Austin: 7
    Chicago: 7
    Philadelphia: 6
    Atlanta: 6
    Pittsburgh: 3
    Durham: 3
    Detroit: 3
    Portland: 3
    Denver: 3
    Dallas: 3
    San Diego: 3
    Salt Lake City: 2
    Santa Barbara: 2
    Las Vegas: 2
    Bloomington: 2

[1] http://pastebin.com/SyYw1aRi