What is a 3 Digit ZIP Code?
A three digit ZIP Code is the first three digits in a 5 digit ZIP Code. So take for example the ZIP Code 10011. The three digit ZIP Code would be 100. The first number a ZIP Code refers generally to the region of the country a ZIP Code covers. ZIP Codes in Maine start with 0 and those in California start with 9 for example. The next two digits specifies a Sectional Center Facility. There are just over 900 three digit ZIP Codes in the US.
