: This adds a four-digit suffix to the standard five digits. For example, if your ZIP Code was 15650, then "3" might be a typo for a four-digit suffix (e.g., 15650-3xxx).
To determine the origin of your number, it helps to look at how the U.S. Postal Service (USPS) organizes mail: 156503 zip
If you suspect there was a typo, the following valid U.S. ZIP Codes share similar digit sequences: : Located in Erie, Pennsylvania. 51503 : Located in Council Bluffs, Iowa. 60503 : Located in Aurora, Illinois. Next Steps for Verification : This adds a four-digit suffix to the standard five digits
: This is the basic geographic identifier. The first three digits represent a Sectional Center Facility (SCF), while the last two identify a specific Post Office or delivery area. if your ZIP Code was 15650