When you go to Coupons.com to find coupons, did you realize that there's an area at the top to enter a zip code. You will find different coupons in different zip codes. Companies sometimes only target specific areas when promoting products using coupons. Therefore it's good to check several zip codes to find the best coupons. You can also leave the zip code field blank. Here's some zip codes to keep on hand when using Coupons.com...