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Format Address API – Subdivisions Lookup
x402
Format Address API – Subdivisions Lookup is a paid API for AI agents from formataddress.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the list of administrative subdivisions (states, prefectures, provinces, etc.) for a given country, including their codes, names, Latin names, and postal code patterns.
Price / call$0.001
Success—
StatusUnknown
How this service works
Verified postal address formatting for 252 countries based on Google's libaddressinput metadata: per-country format rules, address-block composition, verification of your own output, and subdivision lists. Address formatting per Google's libaddressinput metadata — informational, not legal or postal advice.
Output
A JSON object containing the total count of subdivisions, the local label for that subdivision level (e.g. 'prefecture', 'state', 'province'), and an array of subdivision objects each with a key, ISO code (e.g. JP-13), local name, Latin name, and an optional postal code regex pattern.
Example use cases
Address form state/province dropdown
“I'm building a checkout form and need a dropdown of all provinces for Canada with their official codes and names — can you fetch that list?”
Postal validation by region
“For address validation in Brazil, can you get all the state subdivisions with their postal code patterns so I can check if a given postcode matches the right state?”
Localized address UI for Japan
“I need the complete list of Japanese prefectures with both their local kanji names and Latin equivalents, plus postal patterns, to build a localized address entry screen.”
Technical details
Endpoint
GEThttps://formataddress.com/v1/subdivisionsWhen to prefer
Use this endpoint when you need authoritative, per-country subdivision lists for populating address forms, validating postal codes against regions, or localizing address UI — especially when you need both local-script names and Latin transliterations, and postal code patterns, all derived from Google's libaddressinput metadata for 252 countries.
Side effects
- Missing or invalid country code returns an error or empty result
- Unsupported or non-existent ISO country codes may return 400 or empty subdivision list
- Countries with no subdivision data may return an empty array
- Network timeout or service unavailability returns a 5xx error
- Malformed query parameter results in a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 47,
"label": "prefecture",
"subdivisions": [
{
"key": "東京都",
"code": "JP-13",
"name": "東京都",
"latinName": "Tokyo",
"postalPattern": "1[0-9]|20"
}
]
}
}Tags
x402
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