10!
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Answer: Go to. Costco.com and after you give them your zipcode you will be given locations of warehouses near you with phone numbers. The website will link you to a lot of information about Costco.
Costco has a rating of 3 stars from 1,516 reviews, indicating that most customers are generally dissatisfied with their purchases. Reviewers dissatisfied with Costco most frequently mention customer service, credit card and next day. Costco ranks 200th among Grocery sites.