addressLine2

AddressLine2 is a supplementary field used in postal addresses within many data models and form schemas. It provides a secondary line to capture information that does not fit on the primary street line, and it is typically optional. Common uses include apartment or unit numbers, suite designations, floor numbers, building names, or care-of information.

In practice, addressLine1 usually holds the main street address (for example, "123 Main St"), while addressLine2 stores details such as "Apt 4B" or "Building C". Some forms offer addressLine3 for additional details, but not all systems implement more than two lines. The exact meaning and necessity of addressLine2 can vary by country, organization, or data standard.

Internationally, addressing conventions differ. Some countries compress street details into a single line, while others distribute components across multiple lines. Some systems reserve addressLine2 for delivery instructions or special handling notes, whereas others use it primarily for secondary location identifiers. P.O. Box information, if used, may appear in addressLine2 in certain contexts, though many addresses keep PO Boxes in a separate field.

Formatting and validation practices are not universal. There is no single mandatory format for addressLine2, and length limits vary by system. It is generally treated as optional, with input validation focusing on overall address completeness rather than enforcing a specific content pattern.

Privacy and data governance considerations apply, since address components can be sensitive. Organizations should collect addressLine2 only when needed and store it securely, in accordance with applicable laws and policies.

See also: addressLine1, addressLine3, streetAddress, postalCode, locality, region, country.