Where is Area Code 03?
Area code 03 is published for Tokyo numbering region in Japan.
It should be interpreted as a numbering-plan association, not a live geolocation result.
🇯🇵 Japan geographic code
03 Area Code in Japan
Tokyo numbering region. This guide separates the geographic code or numbering range from country calling code +81 and explains domestic and international formats.
International prefix+81 3
Domestic: 03Geographic fixed line
Quick facts
03 Area Code Overview
CountryJapan
Country code+81
Domestic area code03
Code typeGeographic fixed line
Interpretation note
MIC lists NDC 3 as the geographic fixed-line area code for the Tokyo region.
Coverage visualization
Area Code 03 Map
This schematic summarizes the published numbering association without inventing precise geographic boundaries.
03 · Japan
Tokyo numbering region
What Time Zone is Area Code 03?
Japan Standard Time (JST), UTC+9 year-round
Asia/Tokyo: Calculated in your browser
Where a code spans several zones, confirm the destination city before calling.
History
Japan’s Telecommunications Bureau published a detailed national E.164 numbering plan through ITU and updated it in 2014. The plan lists hundreds of geographic fixed-line NDCs and keeps those resources separate from 050 IP-telephony numbers, 070/080/090 mobile or personal numbers, freephone and other non-geographic services.
MIC lists NDC 3 as the geographic fixed-line area code for the Tokyo region.
Nearby Area Codes
“Nearby” means related entries in this country directory, not a guarantee of a shared physical border.
Top 5 Counties or Regions in Area Code 03
Administrative units and telephone zones are different entity types; the list reflects featured city associations only.
Top 50 Cities in Area Code 03
- Tokyo — Tokyo Metropolis
The directory includes verified or clearly qualified city associations and does not claim exhaustive coverage.
Network interpretation
Largest Telephone Carriers
Current operator and market-share data are dynamic. This page avoids assigning a specific number to a carrier from its area code alone.
Landline
Area code 03 is presented as a geographic fixed-line identifier. Consult Ministry of Internal Affairs and Communications (MIC), Telecommunications Bureau for current allocation or licensing information.
Wireless
Wireless numbers commonly use separate ranges. Number portability prevents reliable current-carrier identification from a prefix alone.
Prefixes
+81+3+subscriber number
Domestic code: 03
International prefix: +81 3
Search by City:
- Tokyo — Tokyo Metropolis
By Number:
A number beginning +81 3 matches this numbering pattern. Keep the remaining subscriber digits intact. This directory does not perform reverse lookup or identify a private subscriber.
Listings by Region or State
More Information
Common questions
03 Area Code FAQ
Where is area code 03?
03 is published for Tokyo numbering region in Japan.
How do I call area code 03 from abroad?
Use +81 3 followed by the subscriber number; remove the domestic trunk prefix where applicable.
Does area code 03 identify the current caller location?
No. It describes a numbering-plan association, while portability, forwarding and internet calling can separate a number from the caller’s current location.