USPS Address Validator

Validating your address ensures your mail reaches its destination without delays or returns. Invalid or incomplete addresses cause mail to be returned to sender, which can cost you time and money. USPS processes billions of pieces of mail annually, and proper address formatting helps ensure reliable delivery.

The validator checks if the address exists in the USPS database, verifies the street name and number are valid, confirms the city/state/ZIP combination is correct, and provides the standardized USPS format including the ZIP+4 code for more precise delivery.

A ZIP+4 code is a 9-digit ZIP code (e.g., 10001-1234) that identifies a specific delivery segment like a block, building, or organization. Using ZIP+4 codes helps USPS sort and deliver mail more efficiently and reduces the chance of misdelivery.

Common reasons include: typos in the street name or number, using an outdated street name, wrong city/state/ZIP combination, missing apartment or unit number, using a non-existent address, or formatting issues. Try correcting any typos and ensure all required information is included.

USPS prefers all caps, no punctuation, and a specific order: Line 1 for recipient name, Line 2 for street address (number, street name, unit), Line 3 for city, state abbreviation, and ZIP code. Example: 123 MAIN ST APT 4, ANYTOWN NY 12345-6789