How an address is written in St. Martin

An address in St. Martin is written in this order: house number and street name, then postal code and town or city on one line, with the street line and the town or city in capitals. The strongest check here is a building-level one: the Base Adresse Nationale (IGN and DINUM) lists 25,579,110 addresses in France and its overseas departments and collectivities (version 3 October 2026), though not every address in St. Martin.

The order the lines go in

The parts are named rather than filled in: Spaw does not know an address in St. Martin and will not invent one. This block is produced by the same function that rewrites a real address, so the line order, the capitals St. Martin 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
Postal code TOWN OR CITY

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
postalCode	Postal code	required	—

No house-number rule is carried for St. Martin, so the international default is used: the house number comes before the street name. The postal code is written before the town.

Can Spaw tell whether an address in St. Martin exists?

Partly. The Base Adresse Nationale (IGN and DINUM) lists 25,579,110 addresses in France and its overseas departments and collectivities (version 3 October 2026), but not every address in St. Martin: a partial address register confirms what it holds and denies nothing. An address that is listed answers exists: true; one that is not answers null — not evaluated, never no.

No postal code directory is installed for St. Martin either, so a postal code is checked for its shape and never looked up.

register	covers	lists	coverage	version
The Base Adresse Nationale (IGN and DINUM) fr-base-adresse-nationale	France and its overseas departments and collectivities	25,579,110 addresses	partial	2026-10-03

Further reading: How to read an address-existence answer and How an open register locates a building.

Check an address in St. Martin

The same lookup the API runs, with St. Martin 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 postal code

Postal codes in St. Martin 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 9[78][01]\d{2}

No postcode directory is installed here for St. Martin, so a well-formed postal code is never confirmed to exist — only its shape is checked, and postcode_not_found is never answered for St. Martin.

What St. Martin 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 St. Martin 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 St. Martin

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 MF	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.
postal code pattern	yes	Checked against the pattern the table carries for St. Martin. A value that does not match answers invalid_postal_code.
postal code exists	no	No directory is installed for St. Martin, so a well-formed postal code is never confirmed or denied — only its shape is checked.
Kind of delivery point	partly	No box naming is carried for St. Martin. 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	yes	The address register carries every street its buildings stand on, so match_level answers street when the street is known and the building is not.
Building exists	yes	25,579,110 addresses in France and its overseas departments and collectivities from the Base Adresse Nationale (IGN and DINUM). It does not list every address in St. Martin, so a match answers exists: true and a miss still answers null.
Companies at the address	yes	An open company register is installed for this country, so the number of companies giving the address as their registered office is counted, and a published threshold marks it as a mail drop.
Known mailbox branch	no	No operator branch list covers St. Martin, 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
The Base Adresse Nationale (IGN and DINUM) · fr-base-adresse-nationale 2026-10-03Base Adresse Nationale (IGN/DINUM), Licence Ouverte 2.0
The open company registers · company-registers 2026-10-01INSEE, base Sirene des entreprises et de leurs établissements, Licence Ouverte / Open Licence 2.0

Data synced on 2026-10-03: 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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