What does c/o mean in a mailing address

"C/O" is an abbreviation for "Care of," and it's often used in mailing addresses to indicate that the mail should be delivered to a specific person or department within a building or organization.

When you see "C/O" in a mailing address, it usually means that the mail should be delivered to the person or department listed after the "C/O" designation, rather than to the building or organization as a whole.

For example:

• 123 Main St, Apt 101 C/O John Smith
  • In this case, the mail should be delivered to John Smith at apartment 101 at 123 Main St.
• 456 Corporate Dr, Suite 200 C/O Marketing Department
  • In this case, the mail should be delivered to the Marketing Department at Suite 200 at 456 Corporate Dr.

Using "C/O" in a mailing address can be helpful when you need to send mail to a specific person or department within a larger organization, or when you're sending mail to a building or office that has multiple occupants or departments.

It's worth noting that "C/O" is often used interchangeably with "Attn" (short for "Attention"), which serves a similar purpose. However, "C/O" is generally considered more formal and is often used in business or professional settings, while "Attn" is more commonly used in personal or informal contexts.