211

To ensure a "proper" post for mail delivery, Section 211 of the USPS Postal Addressing Standards requires a standardized format to match ZIP+4 and City State files:

Note: Use standardized abbreviations like "APT" or "STE" rather than the pound sign (#) if the specific designation is known. To ensure a "proper" post for mail delivery,

This code indicates a failure of the base 64K memory on the I/O channel . and any secondary unit designators (e.g.

Street number, street name, and any secondary unit designators (e.g., APT 211). To ensure a "proper" post for mail delivery,