The countries file attached previously in this thread is incompatible with the country files that come with ubercart core. Using this may break things like existing customers, shipping rules etc.

The attached file contains information on all countries (source: iso3166-1), with country id's as defined in ISO, and is compatble with ubercart core files. It does not contain information about zones.

You can import this into your database and it will not remove existing zones you might have imported from ubercart core. You can also import new zones - just disable the relevant country and import it.

I find this good enough for me, since I do need a list of all countries, but not all zones in the world (US, CA are good enough for now.. if more are needed, I'll import them).