"There is a code, and we're about to crack it," said Pete Nowacki, spokesman for the U.S. Postal Service in Minnesota. Across the country, there are more than 42,000 different ZIP codes in use.

You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and ...

The new 729 area code will co-exist everywhere in this region with the 423 area code. Anyone receiving a 729 number will be required to dial 10 digits as well. For more information, click here.

Local phone calls: Beginning at 12:01 a.m. Feb. 11, 2017, you will have to include the area code every time you place a call. Even if your phone number is in area code 315, and you are calling ...

The digits mattered because rotary telephones require longer rotations to enter “0” and other small numbers. The most populated regions, such as California, were assigned the area codes that ...