C / O or “care of” means that the mail is for someone who is not the legal occupant of the address. Learn how to use C / O in mailing addresses effectively and accurately with examples and tips. C / O or 'care of' means you're sending correspondence to someone via another party. Learn when and how to use it, and see examples of its use in different situations. Understanding what does C/O mean in mailing is essential for sending mail accurately. Whether for business correspondence, temporary stays, or third-party handling, using C/O correctly ensures mail reaches the intended recipient. What does “care of” mean in a letter address? Let’s have a closer look. Meaning “Care of” means by the way of someone or through someone. It is often abbreviated “ c/o .” This is used when something is being delivered to an address where they don’t normally receive mail. It is a way of letting the post office know the recipient is not the normal recipient at that address. Use You begin addressing the letter as usual. The recipient’s name goes on the first line. Then, you ...