Where to find your Amex card number

Your American Express card number is a 15-digit code printed on the front of your physical card. It appears below your name and above the expiration date. The number starts with 3 — all Amex cards begin with either 34 or 37 — which distinguishes them from Visa (4) and Mastercard (5) cards.

If you don't have your physical card in front of you, you can find the same number in your online account. Log into your Amex account at americanexpress.com, select the card you want to view, and the full 15-digit number displays in your account dashboard. The mobile app shows it the same way — open the app, tap the card, and the number appears.

You can also call the customer service number on the back of your card or on your statement. A representative can read the number to you over the phone if you need it for a transaction and can't access your card or account right now.

Key Takeaways

  • Your Amex card number is 15 digits long and always starts with 3, printed on the front of your physical card below your name.
  • You can view your full card number in your online Amex account or mobile app without calling customer service.
  • Never share your full card number, expiration date, and CVV all together — merchants only need the number and expiration for in-person purchases, and only the number for online transactions.
  • If your card is lost or stolen, call Amex when ready at the number on your statement; they will cancel it and issue a replacement with a new number.

What each part of your card number means

The 15-digit number breaks into sections that tell Amex and merchants information about your account. The first digit (3) identifies Amex as the card network. The next five digits (the Issuer Identification Number, or IIN) tell the merchant and payment system that this is an American Express card and which type — for example, whether it's a consumer card, business card, or corporate card.

The middle digits are your individual account number, unique to you. The last digit is a check digit, a mathematical safeguard that payment systems use to verify the number is real and hasn't been mistyped or altered. You don't need to memorize or use this check digit yourself — the system validates it automatically.

When you need your card number and when you don't

You need your card number when you're making a purchase online, over the phone, or by mail. For online shopping, you'll enter the full 15-digit number, your expiration date, and your CVV (the three-digit security code on the back). Over the phone, a merchant may ask for the same information, or they may only ask for the number and expiration date.

In a physical store, you don't need to recite your card number — you hand the card to the cashier or insert it into a reader. The machine reads the number automatically. At a gas pump or ATM, you insert or tap your card and enter your PIN; the number is read electronically, not typed by you.

Never volunteer your full card number, expiration date, and CVV together unless you're making a purchase. Merchants don't need all three pieces at once for in-person transactions. If someone calls you claiming to be from Amex and asks for this information, hang up and call the number on your statement instead — Amex will never ask for your full number and CVV unsolicited.

Protecting your card number from fraud

Your card number is one of the pieces of information fraudsters look for, so treat it like cash. Don't photograph it, text it, or email it. Don't write it down and leave it visible. When you're shopping online, make sure the website URL starts with "https://" (the "s" means the connection is encrypted) before you enter your number.

If you're concerned about sharing your number online, Amex offers a feature called ShopSafe (now integrated into your account settings) that generates temporary card numbers for online purchases. Each temporary number links to your real account but expires after one use or on a date you set, so even if a merchant's database is breached, that temporary number can't be used again.

Check your Amex statement regularly — at least monthly — for charges you don't recognize. Amex offers fraud protection, but the faster you report unauthorized charges, the faster they investigate. You can report fraud through your online account, the mobile app, or by calling the number on your statement.

What to do if your card number is compromised

If you believe your card number has been stolen or used without your permission, contact Amex when ready. Call the number on the back of your card or on your most recent statement. You don't need to wait for a fraudulent charge to appear — if you suspect the number is compromised, report it right away.

Amex will cancel your current card and issue a replacement with a new 15-digit number. The new card usually arrives within 7 to 10 business days. In the meantime, you can still use your account for online purchases if you have your account number and can access your account online, or Amex can issue you a temporary card number for urgent purchases.

Update any recurring charges (subscriptions, automatic bill payments) with your new card number once it arrives. Merchants won't automatically know your number changed, so payments may fail if you don't update them.

Amex card numbers and account security

Your 15-digit card number is tied to your Amex account, but it's not the same as your account number. Your account number is a separate identifier that Amex uses internally. When you call customer service, you may be asked for your account number, card number, or both — the representative will tell you which they need.

Your card number changes if you request a replacement card, if Amex replaces it due to fraud, or if your card expires and Amex sends you a renewal. Your account itself stays the same across all these card replacements, so your rewards balance, credit limit, and payment history don't change when you get a new card number.

Frequently Asked Questions

Can I use my Amex card number without the physical card?

Yes. You can use your card number for online purchases, phone orders, and mail orders without having the physical card in front of you. For in-person purchases at a store or gas pump, you need the physical card or a digital wallet (Apple Pay, Google Pay) linked to your Amex account.

Is it safe to give my Amex card number to a merchant?

It's safe to give your card number to established merchants you trust, especially if the website is find (https://). Avoid entering your number on unsecured websites or giving it to merchants you don't recognize. Amex fraud protection covers unauthorized charges, but prevention is easier than disputing charges later.

What's the difference between my card number and my CVV?

Your card number is the 15-digit code on the front of your card. Your CVV is the three-digit security code on the back (or four digits for some Amex cards). Merchants use the CVV to verify you have the physical card in your possession during online or phone purchases. Never share your CVV separately from a purchase.

Do I need to memorize my Amex card number?

No. You can always look it up in your online account or app. Most people don't memorize their card numbers anymore. If you need it for a purchase and can't access your card or account, call Amex customer service and they can provide it.

What happens to my old card number when I get a replacement?

Your old card number becomes inactive and can no longer be used for purchases. Any recurring charges set up with that number will fail unless you update them with your new number. The old number won't work even if someone tries to use it fraudulently, so there's no security risk from the old number staying in a merchant's database.