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"Care of" (C/O) is used on the address of a letter (snail mail) when the addressee's exact address is not known, but the address of another person, office, or entity whom the addressee may know or contact IS known. For example, you know your son, who normally lives with you, is temporarily staying with your sister and her family. You know your sister's address. You address a letter to your son "care of" your sister. The postman may not know your son is on his route presently, but with C/O on the letter, he can leave the letter with her for him.

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13y ago

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