... that's kind of a misrepresentation. In point of fact, there are five - maybe six - national sourcebooks: Tir Tairngire, Tir na nOg, Aztlan, the CFS, Germany (IIRC written and produced primarily by the huuuuge fanbase for SR in Germany, then translated into English), and maaaybe England (via the London Sourcebook). You could argue that Target: UCAS was a UCAS sourcebook, but it actually only talked about a few of its cities, so as a national sourcebook, it's a pretty weak argument. (I always practically forget about the CFS sourcebook; I'm not even sure I own a copy.)
Otherwise, all you have are chapters and portions here and there - the Native American Nation sourcebooks (1 and 2) talk about the NAN nations in general, but not even all of them get in, including the highly-influential Sioux nation. The first North America sourcebook talks about the CAS, the UCAS, the Carib League, but apparently not the specific part you want; be sad, but not mad - there's a lot of empty space on every map. Shadows of Europe, Shadows of Asia, Shadows of North America ... they tag a lot of countries, but none of them in intimate detail. This is pretty much inevitable, because there simply is so much world.
So what you've done is pretty much what plenty of others, myself included, have done - take a look at your home town and 'rebuild it'. Create AA and A and unrated corporations to complicate the local scene; make something spooky, and lots of cool things, and a Z-zone or three to run through when you just have to lose the cops. If you've done it well enough, and subtly enough, and smart enough, well - why not submit it to the Men In Black as a chapter or a web release for a 'Target: XYZ' book?