You can track by entire countries or single neighborhoods. It's up to you.
You can track results from very specific locations in Nozzle. The default locale is set to "Google - United States - English - Country - United States," but you have a great many other options.
You can track from almost any Country, State, Province, Region, County, City, or Zip Code in the world. We also have a handful of more specific options including Neighborhoods, Boroughs, Municipalities, Universities, Prefectures, and Districts. The more specific options, though, will vary depending on which countries you want to track.