The +377 country code is for Monaco, the tiny city-state on the French Riviera known for its casino, Formula 1 Grand Prix, and a population density that makes Manhattan look spacious. About 40,000 people are packed into 2.02 km², making Monaco the most densely populated sovereign state in the world. Only about 9,000 of those residents are actual Monégasque citizens.
Monaco has its own country code, separate from France's +33, even though it's surrounded by France on three sides and the Mediterranean on the fourth. Phone numbers are 8 digits long with no area codes.
Quick answer: +377 is Monaco's country code. All Monaco phone numbers are 8 digits with no area codes or trunk prefix. Mobile numbers start with 4 or 6. Landlines start with 9. Format: +377 XXXX XXXX.
How to call Monaco: quick reference
Monaco uses 8-digit phone numbers with no area codes or trunk prefix. Despite being surrounded by France, you cannot reach Monaco numbers using France's +33 code. You must dial +377.
| Calling from | Dialing format |
|---|---|
| US/Canada mobile | +377 [local number] |
| US/Canada landline | 011-377-[local number] |
| UK | 00-377-[local number] |
| Australia | 0011-377-[local number] |
| Germany | 00-377-[local number] |
| France | 00-377-[local number] |
Understanding Monaco phone numbers
All Monaco phone numbers are 8 digits. The first digit indicates the number type.
Mobile numbers
Mobile numbers start with 4 or 6:
- 4X XX XX XX - Mobile numbers (Monaco Telecom)
- 6X XX XX XX - Mobile numbers (additional range)
Landline numbers
Landlines start with 9:
- 9X XX XX XX - All landline numbers
There are no geographic area codes. Monaco is small enough that the entire principality is one local calling area.
Special numbers
| Number | Service |
|---|---|
| 112 | European emergency number |
| 17 | Police |
| 18 | Fire brigade |
| 15 | Medical emergency (SAMU) |
Mobile carriers in Monaco
Monaco's telecom market is dominated by the state-owned operator, with French carriers providing unofficial alternative coverage.
Monaco Telecom
The sole licensed mobile and fixed-line operator in Monaco. Monaco Telecom is majority-owned by Xavier Niel (the French telecoms billionaire behind Free/Iliad). It operates a 4G LTE and 5G network across the principality and provides all landline services. All +377 mobile numbers belong to Monaco Telecom. The company also runs Monaco's fiber broadband network.
French network spillover
Because Monaco is so small and bordered by France, French mobile signals (Orange, SFR, Bouygues, Free) penetrate deeply into Monaco. Many residents and visitors use French SIMs and connect to French networks while physically inside Monaco. This works fine for day-to-day use, but means they're technically on the French +33 network, not the Monégasque +377 one. If you're calling a Monaco resident, they might answer on either a +377 or +33 number depending on which SIM they're using.
Don't confuse +377 with nearby codes
Monaco's +377 code sits in a cluster of similar European codes, and most people's first instinct is to assume it uses France's number.
| Code | Country | Why it's confused |
|---|---|---|
| +33 | France | Monaco is surrounded by France; many residents carry French numbers too |
| +376 | Andorra | One digit different; both are small European principalities |
| +378 | San Marino | Adjacent code; another European microstate |
| +379 | Vatican City | Very similar code; both are tiny Mediterranean-area states |
The +33 confusion is the most practical problem. Many Monaco businesses and residents have both a +377 number and a French +33 number. If you're told "call my Monaco number" but given a +33 number, it's a French mobile being used in Monaco, not a Monégasque number. True Monaco numbers always start with +377.
Time zone considerations
Monaco follows Central European Time (CET, UTC+1), the same as France, Germany, and most of Western Europe. Summer time (CEST, UTC+2) runs from late March to late October.
| Your location | Time difference from Monaco | Best calling window |
|---|---|---|
| US East Coast (EST) | Monaco is 6 hours ahead | 8 AM-12 PM your time (2-6 PM Monaco) |
| US West Coast (PST) | Monaco is 9 hours ahead | 7-10 AM your time (4-7 PM Monaco) |
| UK (GMT) | Monaco is 1 hour ahead | 9 AM-7 PM your time |
| Dubai (GST) | Monaco is 3 hours behind | 12-6 PM your time (9 AM-3 PM Monaco) |
| Australia (AEST) | Monaco is 9 hours behind | 5-9 PM your time (8 AM-12 PM Monaco) |
Communication in Monaco
Business hours
Monaco follows French business conventions. Offices typically open 9 AM to 12:30 PM and 2 PM to 6 PM on weekdays. Banks close at 5 PM. The financial sector (private banking, wealth management, fund administration) keeps hours aligned with London and Zurich. Luxury retail along the Carré d'Or keeps longer hours, especially during the summer season when yachts fill Port Hercule. During the Grand Prix (late May) and the Monaco Yacht Show (September), normal business schedules go out the window.
Languages
French is the official language and the language of business. Monégasque (Ligurian dialect) is the traditional language but is spoken by only a few thousand people, mostly older native Monégasques. Italian is widely understood given the proximity to Italy and the large Italian community. English is common in finance, hospitality, and among the international resident population. For business calls, French is the default; English works in the financial sector.
Network quality
Monaco Telecom provides full 5G coverage across the principality. Monaco was one of the first countries in Europe to deploy a nationwide 5G network, which is achievable when your country is 2 km². Fiber broadband covers every building. Voice call quality is excellent on both landline and mobile. The only quirk is the French network bleed mentioned above, which can affect which network your phone connects to.
The Monaco diaspora
Monaco doesn't have a traditional diaspora. It's the opposite: more people want to move in than out. The principality is an immigration magnet for wealthy individuals from all over the world, drawn by the zero income tax policy.
Who calls Monaco
The most common international calls to Monaco come from France (family, business, the 40,000+ daily cross-border commuters), Italy (the Italian community and businesses just across the border in Ventimiglia), the UK (financial services, property inquiries), and the Middle East (particularly the UAE, Saudi Arabia, and Lebanon, given Monaco's popularity with Gulf-based families).
The commuter factor
Around 40,000 people commute into Monaco daily from surrounding French towns (Nice, Beausoleil, Cap-d'Ail, Menton) and from Ventimiglia in Italy. This cross-border workforce generates heavy phone traffic between +377 and +33/+39 numbers. Many commuters carry a French SIM and a Monaco SIM, switching between them.
Calling peaks
Phone traffic spikes during the Grand Prix (late May), the Monaco Yacht Show (September), the Monte-Carlo Rally (January), and the Christmas/New Year holiday season when the international community travels home and calls back.
Dialing examples
Calling a Monaco mobile from the US
To call a Monaco mobile number 4612 3456 from a US phone:
- From a mobile: +377 4612 3456
- From a landline: 011 377 4612 3456
Calling a Monaco landline from France
To call a Monaco landline 9876 5432 from France:
- From a mobile: +377 9876 5432
- From a landline: 00 377 9876 5432
This is an international call even though Monaco is surrounded by France. No shortcut exists.
Calling a Monaco mobile from the UK
To call a mobile number 6123 4567 from the UK:
- From a mobile: +377 6123 4567
- From a landline: 00 377 6123 4567
Calling within Monaco
For local calls, dial the 8-digit number directly: 4612 3456. No country code or prefix needed.
Common mistakes to avoid
Assuming Monaco uses France's +33 code
Monaco is an independent sovereign state with its own country code. Dialing +33 with a Monaco number won't reach Monaco. The confusion is worsened by the fact that many Monaco residents carry French +33 numbers alongside their Monégasque +377 ones. If a number starts with +377, it's Monaco. If it starts with +33, it's a French number (even if the person lives in Monaco).
Confusing +377 with +376 (Andorra) or +378 (San Marino)
These three codes are sequential and all belong to European microstates. Double-check the code: +376 is Andorra, +377 is Monaco, +378 is San Marino. Getting one digit wrong sends your call to the wrong country.
Adding a trunk prefix
Monaco has no trunk prefix. The format is +377 followed by 8 digits. Don't add a 0 before the number. People used to French dialing (where you drop the 0) sometimes try +377 0... which is wrong.
Network roaming surprises
If you visit Monaco with a non-French EU SIM, your phone might connect to French networks rather than Monaco Telecom. Since Monaco is not in the EU, connecting to Monaco Telecom counts as non-EU roaming for EU SIMs. Conversely, connecting to a French network in Monaco means EU roaming rules apply. The practical advice: check which network your phone is on and set it manually if you care about costs.
Prefer calling over WiFi? See our guide to the best apps for WiFi calling.
Frequently asked questions (FAQ)
What country uses the +377 code?
The +377 country code belongs to Monaco, an independent city-state on the French Riviera.
Does Monaco use France's +33 country code?
No. Monaco has its own country code, +377. Many residents also have French +33 numbers, but actual Monégasque phone lines use +377.
How many digits are Monaco phone numbers?
All Monaco phone numbers are 8 digits long with no area codes. The full international format is +377 followed by 8 digits.
Is calling Monaco from France a local call?
No. Calling from France (+33) to Monaco (+377) is an international call, even though Monaco is surrounded by France. Your carrier will bill it at international rates.
Does EU roaming apply in Monaco?
Monaco is not in the EU. If your phone connects to Monaco Telecom's network, EU roaming rules don't apply and you may be charged non-EU roaming rates. However, French networks also reach into Monaco, and connecting to those would count as EU roaming for EU SIMs.
Looking for more European dialing guides? Check out our guides for France (+33), Italy (+39), and Andorra (+376), or browse the full country code directory.