What is Costco Online's MCC Code?
Costco Online uses MCC 5300 (Wholesale Clubs). This Merchant Category Code is used by credit card networks to classify transactions at Costco Online.
When you use your credit card at Costco Online, the transaction is tagged with MCC 5300. Your credit card issuer uses this code to determine what rewards you earn—whether it's bonus miles, cashback, or base points.
Best Credit Cards for Costco Online
Citibank Rewards MasterCard
4 MPDNot excluded
Cap: Cap at $1,000 a month
Note: Online spend only - excludes travel-related MCCs (3000-3999 range)
Woman's World MasterCard
4 MPDNot excluded
Cap: Cap at $1,000 a month
Note: Online spend only
UOB Visa Signature
4 MPDNot excluded
Cap: Must spend between $1,000 to $1,200 via contactless and $1,000 to $1,200 for FCY
Note: On Site: Local contactless spend between $1,000-$1,200 | FCY: Foreign currency transactions between $1,000-$1,200
Cards That Don't Earn Bonus
These cards earn base rewards (1 MPD) at Costco Online:
✗HSBC Revolution
✗OCBC Rewards
✗UOB Preferred Platinum Visa
✗UOB Lady's Card
✗UOB Lady's Solitaire
✗UOB KrisFlyer
Tips for Maximizing Rewards at Costco Online
- Use the card with the highest bonus rate for MCC 5300
- Track monthly caps to avoid missing out on bonus rewards
- Check if mobile wallet vs direct payment affects your rewards rate
- Verify the MCC before making large purchases to ensure bonus eligibility
- Consider having multiple cards to maximize rewards across different spending categories