See also: Appendix:Variations of "oc" English English Wikipedia has an article on:OCWikipedia Alternative forms O. C. OC Etymology Initialism of Orange County. Proper noun O.C. Abbreviation of Orange County, New York. Abbreviation of Orange County, California. Anagrams CO$, Co, CO, Co., co-, co, c/o, CO₂, co., ℅, -co-Wikiwand - on Seamless Wikipedia browsing. On steroids.