CountryCode.org is your complete guide to make a call from anywhere in the world, to anywhere in the world. This page details Japan phone code.
The Japan country code 81 will allow you to call Japan from another country. Japan telephone code 81 is dialed after the IDD. Japan international dialing 81 is followed by an area code.
The Japan area code table below shows the various city codes for Japan. Japan country codes are followed by these area codes. With the complete Japan dialing code, you can make your international call.