Country code
Monaco: +377
Monaco uses country code +377. From the United States, dial 011 377 6 12 34 56 78. A number is written +377 6 12 34 56 78.
How to call Monaco
The table uses the example number below. Replace it with the number you are calling. Drop the 0 at the start of the national number when you dial from abroad.
| Calling from | Exit code | Dial |
|---|---|---|
| Any mobile phone | None | +377 6 12 34 56 78 |
| United States | 011 | 011 377 6 12 34 56 78 |
| Canada | 011 | 011 377 6 12 34 56 78 |
| United Kingdom | 00 | 00 377 6 12 34 56 78 |
| Australia | 0011 | 0011 377 6 12 34 56 78 |
| Germany | 00 | 00 377 6 12 34 56 78 |
| France | 00 | 00 377 6 12 34 56 78 |
| India | 00 | 00 377 6 12 34 56 78 |
| Japan | 010 | 010 377 6 12 34 56 78 |
| Mexico | 00 | 00 377 6 12 34 56 78 |
| South Africa | 00 | 00 377 6 12 34 56 78 |
How a Monaco number is built
Digit counts are the national number only, after the country code and without the 0 trunk prefix.
| Line | Digits | Pattern |
|---|---|---|
| Mobile | 8 or 9 digits | 4(?:[46]\d|5[1-9])\d{5}|(?:3|[67]\d)\d{7} |
| Landline | 8 digits | (?:870|9[2-47-9]\d)\d{5} |
| Toll free | 8 digits | (?:800|90\d)\d{5} |
- Example, national form
- 06 12 34 56 78
- Example, international form
- +377 6 12 34 56 78
Validate a Monaco number
Paste a number and the tool checks it against the numbering plan. It returns the standard formats and the line type the plan assigns.
Type the number the way it is written in Monaco, or start with + and the country code.
Who first issued each range in Monaco
4 ranges are listed in the source with the network that first held them. Numbers port between networks, so the current network can differ.
| Starts with | First issued to |
|---|---|
| +377 3 | Monaco Telecom |
| +377 4 | Monaco Telecom |
| +377 6 | Monaco Telecom |
| +377 7 | Monaco Telecom |
4 rows. The first issuer of the range; numbers port between carriers, so the current carrier can differ.
Questions about calling Monaco
- What is the country code for Monaco?
- The country code for Monaco is +377. Written in full, a number looks like +377 6 12 34 56 78.
- How do I call Monaco from the United States?
- Dial 011, then 377 6 12 34 56 78. On a mobile phone you can dial +377 6 12 34 56 78 instead.
- Do I dial the 0 at the start of a Monaco number from abroad?
- No. The 0 is the trunk prefix used for calls inside Monaco (06 12 34 56 78). From abroad it is dropped after +377 (+377 6 12 34 56 78).
- How many digits is a Monaco phone number?
- Mobile numbers have 8 or 9 digits after the country code. Landline numbers have 8 digits.
- How do I call another country from Monaco?
- Dial 00, then the country code and the number. On a mobile phone, + replaces 00.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Country Calling Codes | 1 credit per lookup (an unknown code, country or name is free) | API docs |
Number patterns, lengths and examples: libphonenumber-js 1.13.15, released 2026-10-08, read 2026-10-19, built on Google's libphonenumber metadata. Place names and first issuers: libphonenumber geocoding and carrier files, read 2026-10-19. Library. LookValid is not connected to Google or to any phone company named here.