377 Country Code: Monaco (+377)
Country code 377 (+377) belongs to Monaco. Monaco uses the international dialing code +377, assigned by the International Telecommunication Union (ITU) under the E.164 standard. The ISO 3166-1 alpha-2 code is MC.
You will see the same code written several ways depending on origin: +377 (universal + prefix, works from mobile), 00377 (from countries that use 00 as their international exit code — most of Europe, Asia, and Latin America), 011 377 (from the US and Canada), 0011 377 (from Australia), or the bare 377. All refer to the same Monaco country code. Note: 377 is not a US area code — US area codes are also 3 digits but +377 is the international dialing code for Monaco, not a domestic US destination.
Below you will find the number format, trunk prefix, major city area codes, and dialing facts specific to Monaco (+377).
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Did You Get a Call from +377? Here's What That Means
Any incoming call that displays +377 followed by more digits is originating from Monaco. The caller is dialing you from a Monaco-registered phone number — either a landline or a mobile on a Monaco carrier.
Common reasons people receive calls from +377:
- -Family or friends in Monaco calling from a local number
- -Business contacts at Monaco-based companies
- -Customer support agents working from a Monaco call center
- -Travel-related calls (hotels, airlines, tour operators)
- -Less commonly, robocalls or scam calls that have spoofed a +377 number — if the call is unsolicited, do not return it without verifying the source
Monaco Phone Number Format
International Format Example
Monaco does not use a trunk prefix, so domestic and international formats are effectively the same — just prepend +377.
Calling Monaco Successfully: Common Mistakes & Best Practices
Most failed calls to Monaco come from one of four mistakes, not from network problems. The most common is mishandling the country code itself: Monaco uses +377 with no trunk prefix to remove, so you dial it as-is. The most frequent error is adding a leading 0 by habit — there is none in the Monaco number plan.
The second is misreading the area code on landline numbers — Monaco numbers may have variable formatting depending on the carrier and city, so confirm the area code with the recipient before dialing. The third is dialing during off-hours — Monaco uses local business hours and consumer phones are usually answered between 8 AM and 9 PM local time. The fourth and most expensive mistake is assuming your US carrier's WiFi calling feature makes the call cheap. It does not — see WiFi calling vs VoIP for international calls for why.
For scam-call awareness: +377 is the legitimate Monaco country code, and most unsolicited calls from +377 numbers are legitimate calls from Monaco-based businesses, hospitals, family members, or call centers serving US customers. Caller-ID spoofing exists, so if a call from a +377 number claims to be from a US government agency, your bank, or the IRS, hang up and call the agency back on its published number. Real authorities never demand payment over the phone.
When you are ready to place a call, the cheapest reliable route is to dial +377 from your browser using Kinvo — no app, no carrier add-on, and the per-minute rate is shown before you connect so there are no bill surprises. The browser approach also works from any laptop, tablet, or phone you happen to have access to, which matters when you're traveling, using a work device, or borrowing someone else's computer.
Call Monaco from Your Browser
Call any Monaco number (+377) directly from Chrome, Firefox, Safari, or Edge. No install required. Use it in under 2 minutes.
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Frequently Asked Questions: Monaco Country Code
Which country is country code 377?
Country code 377 belongs to Monaco. The full international dialing code is +377, also written as 00377 from countries using 00 as their international exit code (Europe, most of Asia, Latin America), 011 377 from the US and Canada, or +377 from any mobile phone.
What is the country code for Monaco?
+377 is the international dialing code for Monaco, assigned by the ITU under E.164. The ISO 3166-1 alpha-2 code is MC. Equivalent forms — 00377, 011 377, +377, and 377 — all refer to the same Monaco country code.
Is 377 a US area code?
No. 377 is the international country code for Monaco, not a US area code. US area codes are also 3 digits but they are domestic North American Numbering Plan codes — to reach Monaco from the US, dial +377 or 011 377 followed by the local number.
Can I call Monaco from my browser?
Yes. Kinvo connects calls to Monaco via WebRTC directly from Chrome, Firefox, Safari, or Edge. No app download. Sign up, add credits from $5, and dial +377 followed by the local number.