How an address is written in the U.S. Outlying Islands

An address in the U.S. Outlying Islands is written in this order: house number and street name, then town or city, state and ZIP code on one line, with the street line, the town or city and the state in capitals. Nothing beyond the written form and the ZIP code pattern can be checked here: no address register or ZIP code directory is installed for the U.S. Outlying Islands.

The order the lines go in

The parts are named rather than filled in: Spaw does not know an address in the U.S. Outlying Islands and will not invent one. This block is produced by the same function that rewrites a real address, so the line order, the capitals the U.S. Outlying Islands asks for and any text its operator prints on every envelope are the checker's own behaviour rather than a second description of it.

Organisation
12 STREET NAME
Flat or unit
TOWN OR CITY STATE ZIP code

No recipient line: nothing in the response is about a person, so the name the envelope carries is not part of what is checked.

field	called here	required	capitals
organization	Organisation	optional	—
addressLine1	Street name	required	yes
addressLine2	Flat or unit	optional	—
locality	Town or city	required	yes
administrativeArea	State	required	yes
postalCode	ZIP code	optional	—

No house-number rule is carried for the U.S. Outlying Islands, so the international default is used: the house number comes before the street name. The ZIP code is written after the town.

Can Spaw tell whether an address in the U.S. Outlying Islands exists?

No. No address register is installed for the U.S. Outlying Islands, so exists answers null: not evaluated, never no. An address can be perfectly formed and still not exist, and nothing here will pretend to know which.

No ZIP code directory is installed for the U.S. Outlying Islands either, so a ZIP code is checked for its shape and never looked up.

Further reading: How to read an address-existence answer.

Check an address in the U.S. Outlying Islands

The same lookup the API runs, with U.S. Outlying Islands already selected.

Live demo

POST /demo/address · no key needed

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Response

Look up any address to see the full API response, straight from the live service. The country decides which format it is read against.

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The ZIP code

ZIP codes in the U.S. Outlying Islands are checked against the pattern below rather than a description of it, because the shape is too particular to summarise without losing a case.

pattern 96898

No postcode directory is installed here for the U.S. Outlying Islands, so a well-formed ZIP code is never confirmed to exist — only its shape is checked, and postcode_not_found is never answered for the U.S. Outlying Islands.

What the U.S. Outlying Islands calls an address that is not a front door

A PO box, a private mailbox and the other kinds of delivery point below are told apart by the words written on the address, never by a list of whose box is whose. No box naming is carried for the U.S. Outlying Islands yet, so the international spellings below are what apply. That has one consequence worth knowing: an address here with none of them answers unknown rather than street, because without the operator's own words a missing marker proves nothing.

address_type	written as
private_mailbox Private mailbox at a mail-receiving agency	PMBinternational spellings the checker also reads
po_box Post-office box	PO BOX, P O BOX, POST OFFICE BOX, POSTBOXinternational spellings the checker also reads
general_delivery Held at the counter for collection	POSTE RESTANTE, GENERAL DELIVERYinternational spellings the checker also reads

What can be checked for an address in the U.S. Outlying Islands

Read from the datasets this server holds right now, not written into the page. For most countries the answer is the written form and the postcode shape and nothing beyond them — in particular not the row people assume is always there.

check	for UM	what the answer means
Written form	yes	The address is split into the country's own parts and rewritten in the order above. A missing required part is named in one typed reason rather than a general failure.
ZIP code pattern	yes	Checked against the pattern the table carries for the U.S. Outlying Islands. A value that does not match answers invalid_postal_code.
ZIP code exists	no	No directory is installed for the U.S. Outlying Islands, so a well-formed ZIP code is never confirmed or denied — only its shape is checked.
Kind of delivery point	partly	No box naming is carried for the U.S. Outlying Islands. The international spellings are still read, but an address with none of them answers address_type: unknown — not street, which would be a claim.
Street exists	no	No register is installed for the U.S. Outlying Islands, so a street is neither confirmed nor denied: match_level answers null.
Building exists	no	No address register is installed for the U.S. Outlying Islands, so exists answers null: not evaluated, never no. Absence is not evidence here.
Companies at the address	no	No open company register is installed for the U.S. Outlying Islands, so companies_registered answers null and no mail-drop conclusion is drawn from a count.
Known mailbox branch	no	No operator branch list covers the U.S. Outlying Islands, so is_mail_drop is never set from one here.
Post actually arrives	no	Not from this page, and not from open data in any country: whether post is delivered, and the vacant, residential and agency flags that go with it, are the postal service's own licensed product. Those fields answer deliverability_checked: false rather than a guess.

Null means not evaluated, never no.

Other countries

Sources

Google's Address Data Service · address-formats 2026-09-05© Google LLC, CC BY 4.0 (Google Address Data Service); initial import via commerceguys/addressing (MIT)
The postal operators' addressing guides · address-rules 2026-09-17

Data synced on 2026-09-17: the newest version among the datasets listed above.

Wrong result, or is it about you? If this tool said something you think is wrong, tell us and a person reads it. If Spaw is holding data about you and you never signed up here — a customer may have had your address verified, or reported that a message to it bounced — erase it yourself, confirmed by mail to that address and with no account needed.

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