Your passport number is a unique alphanumeric identifier used to verify your identity across international borders. Finding it takes seconds if you know where to look. On most modern passports, you'll find the number printed prominently in the top-right corner of the biographical information page—the stiff page containing your photo, full name, date of birth, and issuing authority.
If you are filling out international flight reservations, visa applications, or tax forms, this specific string of characters is mandatory. Mistyping a single digit or letter can cause automated airline check-in gates to reject your boarding pass or trigger secondary screening at customs. Beyond international flights, governments and financial institutions use this number to run security checks, verify legal identity for global accounts, and track entry and exit stamps across immigration databases.
Exact Locations of Your Passport Number
The biographical data page is the primary location for your passport number globally, but different issuing countries format their documents with unique layouts.
- United States Passports: The number sits in the upper-right corner of the photo page. For books issued since 2021, the number is laser-engraved into the polycarbonate page. Older versions feature the number stamped in dark ink. It also appears embedded in the machine-readable zone (MRZ) at the bottom of the page.
- UK and European Union Passports: The document number is located on the personal details page, usually positioned at the top right or middle right next to the holder's primary photo.
- Canadian Passports: Canadian documents display the passport number on the hard plastic data page, and the same number is printed vertically on the right edge of the page.
Don't confuse your primary passport number with the passport book number (sometimes called an inventory control number). While the primary passport number identifies you as an individual traveler, the book number tracks the physical booklet itself. On many older documents, the book number appears on an inside cover or barcode label rather than the main data page.
How Formats Differ Across Countries
Passport number structures vary wildly by issuing nation. Knowing what your country's format looks like helps you spot transcription errors immediately.
- United States: Modern books feature 9 characters consisting of one letter followed by eight numbers. Older U.S. documents used 9 digits without any letters.
- United Kingdom: British passport numbers consist of 9 numbers with no alphabetic characters.
- Canada: Canadian passport numbers use 2 letters followed by 6 numbers (e.g., AB123456).
- Australia: Australian passport numbers typically start with a single letter followed by 7 numbers.
Always check the physical document rather than relying on old digital copies, as renewals issue entirely new numbers and expiration dates.
Why This Number Matters for Travel and Security
Border control agencies rely on your passport number to link your physical person to centralized flight manifests and security databases. When an airline transmits passenger manifest data ahead of departure, immigration authorities cross-reference the passport number against watchlists and visa databases.
Financial institutions and foreign embassies also require this identifier to process long-term stay permits or open non-resident bank accounts. Because the number acts as a master key to your international identity, keeping it secure is critical. Avoid sharing your full passport number over unsecured messaging apps or public forums.
What to Do If You Lose Your Passport Number Abroad
Realizing you need your passport number while your physical book is locked in a hotel safe—or worse, stolen—creates an immediate roadblock.
If you travel frequently, you can save your passport details securely in trusted airline apps like Delta Air Lines or encrypted password managers. If you didn't save a digital copy and your physical book is missing, retrieving the number requires contacting your home country's Department of State or nearest embassy.
For U.S. citizens, obtaining a lost passport number requires submitting a formal notarized request under the Freedom of Information Act to the U.S. Department of State Office of Records Management. This process takes time, which is why taking a clear photo of your data page and emailing it to yourself before a trip remains a reliable safety net.
Frequently Asked Questions
Is my passport number the same as my passport card number?
No. Even if you hold both a U.S. passport book and a passport card, they are treated as separate travel documents with distinct numbers. You must use the specific number matching the document you plan to present.
Does my passport number change when I renew my passport?
Yes. Every time you renew your passport, the issuing agency generates a brand-new booklet with a completely new passport number. Your old number remains tied to your expired travel history.
Can someone steal my identity with just my passport number?
While an unauthorized person cannot steal your complete identity with only a passport number, they can use it to book fraudulent travel tickets or compromise certain international accounts. Treat the number with the same caution as your social security or tax ID numbers.
Where can I find my passport number if I am currently abroad?
Check any past flight itineraries saved in your email, hotel registration forms you photographed, or secure digital vault apps where you may have scanned your travel documents prior to departure.
