If you're here looking up OnStar customer care, you probably already know who they are. But it helps to get an idea of how big they are and what their support operation looks like if you are a customer. OnStar also goes by or is associated with the names On Star, Onstar.com, OnStar Corporation, OnStar. They are considered to be part of the following sectors and industries: Information Technology, Technology Hardware & Equipment, Communications Equipment, Computer Networking. OnStar is associated with terms like subsidiary, private, b2c, b2b, networking by their customers and industry analysts. They employ 67 people according to customers in the know.