Zip Code Book - Version 4.0 A zip code (and city, state, area code) lookup program for Windows. Enter a zip code to find the corresponding city, state and area code. You can also find a zip code by entering a city name and two-digit state abbreviation. Zip Code Book supports copy and paste to and from other Windows applications (like word processors, spreadsheet programs and databases). Contains a database of over 75,000 zip codes and city/place names.