C/o Meaning
"C/o" is an abbreviation for "care of," used in mailing addresses to direct correspondence to a person at another person's address. It indicates that mail should be delivered to an intermediary who will then pass it along to the intended recipient.
What Does C/o Mean?
"C/o" stands for "care of" and functions as a postal notation used when sending mail to someone who doesn't receive correspondence at their own address. The abbreviation solves a practical problem: how to deliver mail to a person when you don't have their direct mailing address.
Standard Usage
The c/o notation appears on the second line of a mailing address, typically placed before the name of the person or organization that will receive the mail on behalf of the intended recipient. For example, if you're sending a letter to someone staying temporarily at a friend's house, you would write the friend's address but include the resident's name with "c/o" preceding it.
Historical Context
Before digital communication became dominant, c/o was essential in business correspondence, legal documents, and personal mail. During the era when people frequently changed residences or traveled extensively, this abbreviation became standardized by postal services across English-speaking countries. It remains an official postal convention recognized by the USPS, Royal Mail, and Canada Post.
Modern Applications
Today, c/o appears in several contexts:
- Temporary residences: Sending mail to someone staying at a hotel, care facility, or relative's home
- Business correspondence: Directing mail through a company's reception to a specific employee
- Celebrity fan mail: Reaching actors, musicians, or public figures through their agents or management companies
- Legal proceedings: Serving documents through another party
- Institutional mail: Sending correspondence to students through school addresses or patients through medical facilities
Format and Placement
When writing a c/o address, the notation should appear on the line immediately before or after the intermediary's name, depending on postal service guidelines. In modern usage, "c/o" is written in lowercase with periods, though variations like "C/O" in capitals remain acceptable. The abbreviation must be legible to postal workers, so it should appear in the address block clearly.
Digital Age Evolution
Email and digital communication have reduced the necessity of c/o notation significantly. However, it remains relevant for physical mail delivery and appears in formal address formats, business directories, and official documentation where forwarding addresses are necessary.
Key Information
| Context | Purpose | Typical User |
|---|---|---|
| Personal | Temporary residence forwarding | Travelers, students |
| Business | Employee mail routing | Companies, corporations |
| Legal | Document service | Attorneys, courts |
| Entertainment | Celebrity contact | Fans, media |
| Institutional | Departmental delivery | Universities, hospitals |
Etymology & Origin
English, mid-20th century business and postal convention