Each passport booklet receives a unique identifier printed on its biographical page. On a U.S. passport, find the nine-character sequence on the passport personal information page, then compare it with the machine-readable zone before entering it in an airline, visa, or application record.
This guide explains where the identifier appears, how document formats differ, and how you can enter it accurately without confusing it with a visa, driver’s license, national ID, or expired passport.
The Identifier Assigned to a Specific Passport
A passport number identifies one physical booklet rather than your identity for life. Your name, date of birth, and nationality may remain the same after a passport renewal, replacement, or reissue, but the U.S. Department of State can assign a different number to the new document.
That change matters because an airline reservation or border system may use the number to retrieve the exact document record. A mismatched identifier can send a system searching for a booklet you are no longer carrying, which may lead to manual review before you board.
Your passport number remains separate from your driver’s license number, Social Security number, national identification number, and visa number. A visa number belongs to a visa or related travel authorization, so it cannot identify the passport booklet supporting your application.
For a child, use the number printed on the child’s passport. Your passport number identifies your own document, and entering it for your child can attach a flight reservation or application to the wrong traveler.
Where the Number Appears on a US Passport
You can find the identifier on the passport identification page, also called the biographical page. Look near the top of that page for “Passport No.” or “Passport Number,” beside your photograph and printed personal details.
The visible number is the first place to copy from, but it is not your only verification point. A U.S. passport also places the identifier in the machine-readable zone, or MRZ, across two lines near the bottom of the identification page.
Compare the visual number with the corresponding MRZ field. Both locations should contain the same sequence. A disagreement may result from faded printing, physical damage, an unclear scan, or a mistyped character.
You should use the number from the passport you are submitting or presenting. A previous passport number does not belong in a current application unless the form specifically identifies that earlier booklet.
Use the number on the passport you are submitting. Do not substitute a previous booklet’s number unless a form specifically asks about that older document.
Reading the Number and Machine-Readable Zone
A U.S. passport commonly contains nine characters, although they can include letters, digits, or both. Passport designs and identifier formats belong to the issuing country, so a travel document from another nation may use a different length or pattern.
You should never count characters from memory or assume that every U.S. passport begins with the same letter. Copy the exact sequence from the physical document, preserve its capitalization, and remove spaces only when the receiving form requires a continuous string.
MRZ Document Data
The MRZ follows International Civil Aviation Organization specifications. Its fields can contain the document type, issuing country, passport number, surname, given names, date of birth, personal-data marker, expiration date, and check digits.
A standardized field length does not mean that every visible passport number fills that capacity. An ePassport also stores electronic information on an embedded chip, but you still copy the printed booklet number unless the receiving system gives you different instructions.
| Detail | What It Means |
|---|---|
| Passport number | Identifier printed on one specific travel document |
| Travel document number | Broader field name that may cover a passport or another recognized document |
| Document type | Identifies the record as a passport or another recognized travel document |
| Issuing country | Names the country whose authority issued the document |
| MRZ document field | Machine-readable location for the printed document number |
Because European Union and Schengen Area travel records may request both the passport number and issuing country, include the country when the form supplies a separate field. Do not treat a Schengen visa number as a replacement for the identifier printed in your U.S. passport.
Entering It on Applications and Travel Records
Enter every character exactly as the issuing authority displays it. Exclude labels such as “Passport No.,” and omit spaces or punctuation unless the form’s instructions specifically tell you to include them.
A Reliable Entry Routine
- Open the current passport. Locate the identification page and confirm that the booklet belongs to the traveler named in your record.
- Read both locations. Compare the visually printed identifier with the corresponding field in the machine-readable zone.
- Copy each character. Preserve every letter and digit, and follow any capitalization rules displayed by the form.
- Check the entire record. Verify your name, nationality, date of birth, expiration date, destination, and other required details.
- Save the confirmation. Keep the itinerary or application reference so you can identify the document number you submitted.
Your application method determines which Department of State form you use. Form DS-11 applies when you must apply in person, while Form DS-82 provides for an eligible passport renewal by mail; the current instructions for your application should govern.
An HM Passport Office request may also depend on a particular application or citizenship record. You should follow the written instructions for that request rather than substituting a number from another document or a previous passport.
At an airline, the identifier must match the document you present at the check-in counter. At a visa office, it connects your request to the passport supporting it, so a mistyped character can cause a request for corrected information or prevent automated processing.
A mismatch can interrupt the check-in process rather than guarantee denied boarding. The precise consequence depends on the airline, visa office, or border system, but correcting the number before submission gives you the clearest path forward.
Handling Renewals, Replacements, and Reissues
A renewed or replaced passport can receive a new number even when your personal details remain unchanged. Once you receive the new booklet, update airline bookings, visa records, and applications that still display the former identifier.
Your travel plans may require you to carry an old passport alongside the new one. In that situation, follow the destination’s rules and distinguish between the current number and any number specifically requested for the prior document.
Other family documents cannot fill the same field. A birth certificate number identifies a civil record, while a parent’s passport number identifies the parent’s booklet; neither replaces the number assigned to the child’s own passport.
Because an airline profile can carry information for several travelers, review the number beside each name. This check prevents a parent’s identifier from being attached to a child’s reservation or booking.
Resolving Missing, Damaged, or Unreadable Numbers
You should not guess when characters are missing or unreadable. First compare the visual passport number with its MRZ field, using a clean, well-lit image or the physical booklet rather than a blurred photograph.
Faded ink, a torn MRZ, or water damage can cause automated systems to read the identifier incorrectly. Your best option is a current, undamaged passport, but the Department of State can provide replacement instructions for a qualifying U.S. document.
You cannot use a driver’s license, visa, Social Security number, or national ID number as a substitute. Each of those identifies a different record, even when the document includes your photograph, signature, or other matching information.
Contact the relevant foreign issuing authority when the unreadable document is not a U.S. passport. Give the agency enough information to locate your record without placing the full passport page in an unsecured message.
Protecting Your Passport Information
Your passport number becomes more useful to an impersonator when it appears beside your name, date of birth, nationality, and itinerary. That combination gives someone more personal data than the nine-character identifier alone.
Share Only What the Organization Needs
- Verify the recipient. Confirm that an airline, visa office, border authority, bank, or other organization needs your passport details before sending them.
- Use a secure form. Prefer a protected website or encrypted application instead of an ordinary email thread.
- Redact unrelated details. Cover biographical information that the receiving organization does not need to identify your document.
- Check the identifier. Confirm the number, expiration date, destination rules, and passport booklet before submission.
- Keep a record. Note which passport supported each booking, visa request, or other travel transaction.
A bank may request a passport number for a travel-related service, while a border authority may collect it during arrival processing. Your purpose for sharing does not change the need to verify the recipient and use the channel that organization provides.
Redaction requires a full-page review because covering only your photograph or signature may leave your number and MRZ visible. Check every area of the image, including the lower machine-readable lines, before you send it.
A secure copy does not justify unnecessary exposure. Share only the document fields required for the transaction, and remove unrelated personal information whenever the receiving organization permits it.
Bottom Line
Your identifier belongs to the specific passport booklet you will use, not to you for life. Locate it on the passport personal information page, compare it with the MRZ, and copy the exact characters into each required field.
A renewal, replacement, or reissue can change the number assigned by the Department of State. Review reservations, applications, and saved passport images after receiving a new booklet, and keep each record aligned with the document you will actually present.
FAQ
What is a passport travel document number?
One booklet or recognized travel document is assigned a unique identifier for identification and recordkeeping. Airlines, visa offices, and border authorities use it to distinguish that document from your driver’s license, visa, Social Security number, or national ID.
Is the passport number the same as the travel document number?
Both numbers generally identify the same passport booklet through one unique code. A form may use the broader term because it also accepts other recognized travel documents, so your entry should match the document you are submitting.
Where is the number located on a US passport?
You can find the number on the U.S. passport identification page near the top, where “Passport No.” appears with your printed personal details. The MRZ near the bottom contains a second copy in its document-number field.
Where is the passport number located?
Look on the biographical or identification page to find the passport number. Look near the top for the printed identifier, then compare it with the machine-readable field across the two MRZ lines near the bottom.
What is a passport document number?
A unique identifying code is assigned to each passport booklet or other recognized travel document. It helps an airline, visa office, or border authority distinguish the document from a driver’s license, visa number, or national identification number.
How many numbers are in a US passport number?
A U.S. passport commonly has nine characters, but those characters can include letters and digits rather than nine digits alone. Other countries use different lengths and formats, so you should copy the sequence printed on your document.
