San Marino Country Code

The country code for San Marino is +378.

Calling code: +378
ISO code: SM · SMR
Region: Europe
Dialling out: 00

How to call San Marino from the US

011+378+local number

011 is the US and Canadian exit code; from a mobile you can dial + instead, anywhere in the world. San Marino has no trunk prefix to drop: dial the local number exactly as it is written.

Example San Marino numbers in international format, as published by the numbering-plan source.
Line type	Dial from abroad
Fixed line	+378 0549886377
Mobile	+378 66661212

Calling out of San Marino

To call abroad from San Marino, dial 00 before the destination's country code. From a mobile, + works instead.

Scope the San Marino calling code and its dialing rules. Source datasets/country-codes (E.164 + ISO 3166) (ITU-T E.164 + ISO 3166, 2026-07 release) and libphonenumber PhoneNumberMetadata (Google) (libphonenumber master, 2026-08 snapshot). Updated 25 August 2026. Example numbers are the numbering plan's own published examples, not real subscriber lines.