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Examples (mailing address)

Mr. John Q. Teacher
c/o Independence High School
1776 Oak Park Ave.
Freedom Heights, IL

  1. (shipping) Abbreviation of care of, used to identify an intermediary who is responsible for transferring a piece of mail between the postal system and the final addressee.
    • 1976-1977, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure
      Sunday I penned my letter, Monday I mailed it c/o the high school.
    Anna c/o BobAnna at Bob's address
    Send your mail to me c/o Mr. John Smith.
    “But he sent it to you, didn't he?” “No, he sent it to himself c/o me.”
  2. (medicine) Abbreviation of complain of, used to identify symptoms described by a patient.
    • 2009, Carol J. Rollins, “Adult Enteral Nutrition”, in Terry L. Schinghammer, Julia M. Koehler, editors, Pharmacotherapy Casebook: A Patient-Focused Approach[1], 7th edition, McGraw Hill, →DOI, →ISBN, page 366:
      She was admitted to the hospital 6 days ago with c/o nausea, vomiting, and RUQ [right upper quadrant of the abdomen] pain. Her diet has not advanced beyond clear liquids, which she failed to tolerate on two attempts. Roa continues to c/o nausea and RUQ pain.

Usage notes[edit]

  • (medicine): Frequently used in the notes taken by a doctor during a medical encounter.

Alternative forms[edit]

Related terms[edit]

  • (care of): d/o (daughter of), s/o (son of)



c/o (plural c/os)

  1. (shipping) Initialism of certificate of origin, a document describing a product's country of origin.

Alternative forms[edit]




Borrowed from English c/o. According to SO attested since 1906.


As English "care of".



  1. c/o
    Anders Anderson c/o Sven Svenson, Kungsgatan 12
    Anders Anderson c/o Sven Svenson, King's Street 12