Address fields

Address Line 2 Meaning and Examples

Updated July 19, 2026

Address Line 2 is the optional part of an address that adds delivery details after the main street address. It usually contains an apartment, suite, unit, floor, room, department, building, or mailbox detail.

Common Address Line 2 values

Apt 4B for an apartment.
Suite 1200 for an office suite.
Unit 8 or #8 for a unit number.
Floor 3 or Room 302 for larger buildings.
Building A for campuses or multi-building complexes.

Example format

Jordan Miller
845 Market St
Suite 420
San Francisco, CA 94103
United States

Testing recommendations

Test your form with Address Line 2 empty, short, long, and combined with the street line. CSV exports should preserve the field as text, and mobile layouts should not hide or truncate apartment and suite labels.

Field mapping for QA

Value	Typical meaning	Expected behavior
Apt 4B	Apartment	Accepted as optional secondary delivery information.
Suite 1200	Office suite	Stored as text and preserved in exports.
Building A, Floor 3	Complex or campus detail	Long values wrap without clipping on mobile.
Empty	No secondary detail	Form can submit when the field is optional.

Practical QA examples

Paste a 100-character unit description and confirm the limit is clear rather than silently truncating data.
Enter Unicode building text in an international form and verify normalization does not remove meaningful characters.
Export a record with Address Line 2 empty and one with Apt 4B; both rows should keep the same column order.

Preservation test across optional states

Create three records with the same main street line: one with Address Line 2 empty, one with Apt 4B, and one with a long building-and-floor value. Save, edit, export, and re-import all three. The empty value must remain valid, and populated values must stay attached to the correct address rather than being appended unpredictably to the city or street.

Transition	Expected behavior	Bug exposed
Empty to populated	The new value appears once on labels and receipts.	A stale empty placeholder creates a blank line or comma.
Populated to empty	The field clears without deleting Address Line 1.	A combined-address update removes the street.
Country change	The value is retained until the user confirms how to remap it.	The form silently discards an apartment or building.

Reference

USPS Publication 28: Secondary Address Unit Designators

Generate examples

The U.S. address generator, Japan address generator, and UK address generator include secondary address variants for QA workflows.