Collect the full address
Start with the recipient name, street number and name, apartment or suite identifier if applicable, city, state and ZIP Code. Missing unit numbers are a common reason apartment deliveries become difficult.
Check standard formatting
Use a consistent address format and avoid adding unnecessary directions or notes to address lines. Keep apartment, suite or unit details in the appropriate secondary address field.
Use an authoritative lookup
A ZIP Code directory can help identify likely city and state information, but it cannot verify that a particular address is deliverable. Use USPS address lookup or an authorized address-validation service for that purpose.
Review before mailing
Confirm spelling, street suffix, unit number and ZIP Code with the recipient or official source. For bulk mail, test the address-cleaning process and follow the applicable USPS mailing standards.