Zip Code

• National Address Server
  
  User enters an address and the site provides a zip code+4. A free service provided by the CEDAR Research Group of SUNY Buffalo.
  

  https://www.cedar.buffalo.edu/adserv.html
• Entertainment.com
  
  Headquartered in Troy, Michigan, Entertainment Publications is an industry leader in 50% off coupons. These include discounts for restaurants, movies, car repairs, and much more. Users search by zip code to find out what is being offered and whether or not to subscribe. The website offers several scenarios to show how actual users can save money. Users can subscribe online.
  

  https://www.entertainment.com/
• WhitePages
  
  Established in 1997, WhitePages is a people search authority, with comprehensive contact information and background check data about hundreds of million people from all 50 USA states. Users can search for businesses, people, maps and directions, by phone number, zip code or area code. There are other more advanced search strategies on the website as well.
  

  https://www.whitepages.com/
• USPS: United States Postal Service
  
  USPS is an independent establishment of the Executive Branch of the U.S. Government. It runs like a business. USPS delivers 213 billion pieces of mail each year to more 300 million people in 146 million homes and PO boxes. On the website, users can track and confirm mail, look up a ZIP code, calculate postage, locate a post office, find a postal store, and more. Also on the website is a history.
  

  https://www.usps.com/

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