If you're here looking up Costco.com 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. Costco.com also goes by or is associated with the names Costco Wholesale Corporation, Costco Wholesale. They are considered to be part of the following sectors and industries: Consumer Discretionary, Retailing. Costco.com is associated with terms like public, retail, e-commerce, b2c, wholesale by their customers and industry analysts. They employ 126,000 people according to customers in the know.