Area Code Overview
Area code 671 is a geographic telephone area code in Guam that went into service on July 1, 1997. The geographic regions covered by this area code overlay has a population of approximately 0.
Overlay and Dialing Rules
- Area Code: 671
- State: Guam
- Type: General Purpose Code
- In Service Date: July 1, 1997
- Overlay Complex: 671
- Local Dialing Plan: This area does require you to dial the area code when calling locally.
Estimated Number of Assigned Phone Numbers in Area Code 671
This area code is ranked 325th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 1st out of 1.
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 671
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 671
Estimated assigned wireless phone numbers: 0
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
No wireless provider distribution is available for this area code.
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 671
Estimated assigned wireline and VoIP phone numbers: 150,000
Other / Unclassified Assigned Numbering in Area Code 671
Estimated assigned other or unclassified phone numbers: 790,000
Cities and Towns in Area Code 671
How These Figures Were Built
These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 671, not live customer counts.
Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.
They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.
Population data and locality matching provided by GeoNames.
Last refreshed: April 15, 2026 6:22 pm