Address Line 1 is the primary part of an address that contains the main street address information needed to locate the recipient's location. It usually includes:

• Building or house number
• Street name
• Street suffix (such as Road, Street, Avenue, Boulevard, abbreviated or spelled out)
• Sometimes, if no secondary address field is available, apartment or unit numbers may also be included here

For example, in "2566 Dow St, Box 168," Address Line 1 would be "2566 Dow St"

. Address Line 2 is an optional field used to provide additional address details that help specify the exact location within the primary address. This includes:

• Apartment, suite, room, or floor numbers
• P.O. Box numbers
• Secondary unit designators

For example, if the full address is "364 Brewery Lane, Apt. 204," Address Line 1 would be "364 Brewery Lane," and Address Line 2 would be "Apt. 204"

USPS Addressing Standards Summary

According to USPS guidelines, Address Line 1 should contain the primary street address with building number and street name, while Address Line 2 should contain secondary unit designators like apartment or suite numbers to ensure accurate delivery

Conclusion

• Address Line 1 is mandatory and contains the main street address including building number and street name.
• Address Line 2 is optional and contains additional location details such as apartment or suite numbers.
• Proper use of these lines helps postal services and couriers deliver mail and packages accurately and efficiently

FAQ

Q: Can Address Line 2 be left blank?
A: Yes, if there is no secondary address information like apartment or suite number, Address Line 2 can be left blank

. Q: Should P.O. Box numbers go in Address Line 1 or 2?
A: P.O. Box numbers can be placed in Address Line 2 or sometimes in Address Line 1 if no secondary field is available, depending on the form design

. Q: Why are there two address lines?
A: Two lines allow for better formatting and clarity, helping automated mail sorting and ensuring precise delivery to the correct unit within a building or complex

. This explanation aligns with USPS standards and common address formatting practices.