Countries · Monaco

Monaco: how an address is written and what we verify

Every address in the country comes back in the national postal form and is checked against the national address register: street, house number, postcode, coordinates. Here you find how an address is written there, what we check and three before-and-after examples.

Try it on an address API documentation

What an address looks like

House number·before the street (“12 Rue de la Paix”)
Postcode·5 digits; the country prefix in front (D-, F-, CH-) is removed
City·in capitals, in its local name
Country·country line and ISO code, in the reader's language

The house number precedes the street, as in France (“2 Avenue de la Costa”); the postcode is 98000 for the whole Principality and the city is always “Monaco”: Monte-Carlo, La Condamine and Fontvieille are districts and do not belong on the city line. The Principality does not publish an open address register: we answer from OpenStreetMap, and say so.

What we verify

Addresses: from various sources, where volunteers have mapped them · postcodes: 100% · data as of 20 Sep 2026.

Street·exists in the municipality, written in full and in the register's spelling; abbreviations are expanded in the country's language
House number·exists on that street; if the street exists and the number does not, the outcome flags it
Postcode·confirmed or filled in by the register, in the country's format
Coordinates·latitude and longitude of the house number, with the precision declared
Autocomplete·the street completes as you type, from the register; the house number and the postcode come with the selection (API)
WooCommerce · PrestaShop·autocomplete at checkout and order verification with the plugins

Before and after

Three addresses written the way people write them — abbreviated, without postcode, in lower case — and how they come out: public buildings and streets of the city centre, verified down to the house number.

2 avenue de la costa, MC-98000 monaco → 2 Avenue de la Costa
98000 MONACO postcode fixed · coordinates of the house number · © OpenStreetMap contributors
6 rue grimaldi, monte-carlo → 6 Rue Grimaldi
98000 MONACO postcode filled in · city in postal form · coordinates of the house number · © OpenStreetMap contributors
12 av. d'ostende, 98000 MONACO → 12 Avenue d'Ostende
98000 MONACO street written in full · coordinates of the house number · © OpenStreetMap contributors

With the API

The same endpoint as every country: country_code is enough. The response carries the address in postal form, the outcome with the changes, and where the register is in service the coordinates, the municipality code and the district. Everything in the API documentation.

curl -X POST https://www.radaraddress.com/api/v1/contact \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{"address":"2 avenue de la costa","postcode":"MC-98000","city":"monaco","country_code":"MC"}'

Frequently asked questions

Do you also verify addresses that are in a file?

Yes. In batch jobs a column with the country is enough, or the country set for the whole file: every row comes back in the country's postal form, with the outcome beside it and, where the register is in service, verified down to the house number.

What happens if an address is not in the register?

We say so. If the street exists and the house number does not, the outcome flags the house number; if the street is not found in the municipality, the address still comes out in the country's postal form, with the warning. We never invent a plausible address in place of the one that is missing.

Where do the data come from?

From OpenStreetMap (© OpenStreetMap contributors, ODbL licence): this country does not publish an open address register, and we answer with what volunteers have mapped. Where OpenStreetMap does not have the address, it comes out in the country's postal form without being declared wrong.

The other countries

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