1) Co. is used as an abbreviation for company when it is part of the name of an organization.

...the Blue Star Amusement Co.

2) Co. is used as a written abbreviation for county before the names of some counties, especially in Ireland.

...Co. Waterford.

3) PHRASE: n-proper PHR You use and co. after someone's name to mean the group of people associated with that person. [INFORMAL]

Wayne Hussey and co. will be playing two live sets each evening.

English dictionary. 2008.

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