A passport document number is the unique identifier assigned to your specific passport booklet or card, working like a serial number for that physical document rather than an ID tied to you as a person. On a U.S. passport book, you’ll find it in the upper right corner of the data page, the laminated page that shows your photo, name, and date of birth. A new number is issued every time you get a new passport, so the number follows the booklet, not the traveler.
Where to Find It on a Passport Book
Open the passport to the data page. The number appears in the upper right corner, labeled “Passport No.” or “Passport Number.”1U.S. Department of State. Information about the Next Generation U.S. Passport It’s also encoded in the machine-readable zone (MRZ), the two lines of characters at the bottom of the data page that airline kiosks and border agents scan.
The same number is perforated through the interior pages of the booklet. That perforation is a security feature: if someone tried to swap a page from a different passport, the tiny numbers wouldn’t line up. Flip through the book and you’ll see the number repeated.
Where to Find It on a Passport Card
The U.S. passport card is a wallet-sized alternative to the book. It’s valid for land and sea travel between the U.S. and Canada, Mexico, Bermuda, and certain Caribbean countries, and the TSA accepts it for domestic flights, but it cannot be used for international air travel.2U.S. Department of State. Get a Passport Card
The card carries its own document number, printed on the back near the eagle graphic and also embedded in the card’s MRZ. If you hold both a book and a card, each has a different number because each is a distinct document.
How the Number Is Formatted
Passports issued before the Next Generation design rolled out in 2021 have a nine-digit numerical code. Passports issued since then use an alphanumeric format: one letter followed by eight digits.1U.S. Department of State. Information about the Next Generation U.S. Passport Both formats remain valid for travel until the passport expires. An older all-numeric passport doesn’t need to be replaced early.
When You’ll Be Asked for It
The passport number comes up in more places than most travelers expect:
- Visa applications. Most countries that require a visa ask for your passport number, and the issued visa is tied to that specific passport.
- Pre-travel authorizations such as the Electronic System for Travel Authorization (ESTA) for the U.S. Visa Waiver Program.3U.S. Customs and Border Protection. Frequently Asked Questions about the Visa Waiver Program (VWP) and the Electronic System for Travel Authorization (ESTA)
- International flight bookings, where airlines collect Advance Passenger Information before departure.
- Form I-9 employment verification in the United States. A U.S. passport or passport card qualifies as a “List A” document, satisfying both identity and work authorization, and your employer records the document number from whichever ID you present.4USCIS. 13.0 Acceptable Documents for Verifying Employment Authorization and Identity
- Arrival and departure cards, electronic customs declarations, and immigration landing forms at foreign ports of entry.
Officials and systems use the number to confirm the document is valid, hasn’t been reported lost or stolen, and matches authorized travel records.
The Number Changes With Every Renewal
A new passport always carries a new document number. Renew by mail, online, or in person, and the replacement will not match your old one.5Travel.State.Gov. Frequently Asked Questions about Passport Services That matters because any visa, travel authorization, or booking tied to the old number does not automatically update.
If you still have a valid visa in an expired or replaced passport, you generally don’t need to apply for a new visa. You can travel with both, presenting the new passport for entry alongside the old one showing the valid visa; a border officer typically stamps the new passport and notes that the visa is in the other document.6U.S. Department of State. About Visas – The Basics Never try to remove a visa from one passport and place it in another. Doing so invalidates the visa.
When you renew online, you keep your most recent passport rather than sending it in.5Travel.State.Gov. Frequently Asked Questions about Passport Services Hold on to any old passport until the visas inside it have expired.
If Your Passport Is Lost or Stolen
Reporting a passport lost or stolen using Form DS-64 triggers immediate electronic cancellation. The document number is permanently invalidated and cannot be reused.7U.S. Department of State. Statement Regarding a Valid Lost or Stolen US Passport or Card DS-64 The cancellation is irreversible. If the passport turns up later in a coat pocket, it’s still cancelled, and you’ll need to apply for a new one with a fresh number.
The cancellation flows into an international database checked by border agencies, so a reported-lost passport will flag at any checkpoint.
Finding Your Number Without the Passport in Hand
If you need the number but the passport isn’t with you, check photocopies or digital scans you may have saved, international airline booking confirmations, or previous visa or ESTA applications where you entered the number.
If none of those work, the State Department will provide copies of your passport records. Regular copies are free; certified copies cost $50.8U.S. Department of State. Get Copies of Passport Records Separately, when you apply for a new passport and cannot submit your previous one as evidence of citizenship, a $150 file search fee may apply, specifically for records issued before 1994.9U.S. Department of State. Passport Fees
A simple habit prevents most of this trouble. Photograph or scan the data page the day the passport arrives, and keep the image somewhere secure. If the passport is ever lost, stolen, or just at home when you’re filling out a form on the road, the number is a click away.