Full list of United States ZIP codes. Organized per state and county, with the posibility to show on a map the selected city and the entire county. Fast search by name or by ZIP code. Possiblity to mark cities as favorites and review them later. Where available there would be a link to Wikipedia with more information for each city. You can also see the distance between you and the city selected, as well as the distance between the selected city and the rest of the cities in the county.