How do i contact costco customer service? There are a few numbers customers can choose from when attempting to contact Costco customer service. Costco online member services: 1-800-955-2292. General member services: 1-800-774-2678. Costco travel customer service: 1-877-849-2730. Costco pharmacy: 1-800-607-6861.What is the customer service number for costco? How to call Costco: use the toll free number below to contact customer service for help with orders and membership questions. When you call, you will be asked the questions below. 1-800-955-2292. Thank you for calling Costco.com.
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