Area Code 671
Area code 671 is in Guam , serving 19 cities, including Dededo, Yigo or Tamuning; it currently uses 91 prefixes, assigned from 671-201-XXXX through 671-998-XXXX.
In service date for area code 671: July 01, 1997.
The current local time is .
For exact NPA boundaries see official 671 area code map
Phone number lookup
Locate any 671-NXX prefix:
| NPANXX | Area Served1 | Date1 |
|---|---|---|
| 671-201 | Agana | 06/02/2023 |
| 671-300 | Agana | 3/23/2007 |
| 671-333 | Agana | N/A |
| 671-339 | Agana | N/A |
| 671-343 | Agana | N/A |
| 671-344 | Agana | N/A |
| 671-349 | Agana | N/A |
| 671-355 | Agana | N/A |
| 671-362 | Agana | N/A |
| 671-366 | Agana | N/A |
| 671-400 | Agana | 11/4/2010 |
| 671-456 | Agana | N/A |
| 671-471 | Agana | N/A |
| 671-472 | Agana | N/A |
| 671-473 | Agana | N/A |
| 671-474 | Agana | N/A |
| 671-475 | Agana | N/A |
| 671-477 | Agana | N/A |
| 671-478 | Agana | N/A |
| 671-479 | Agana | N/A |
| 671-480 | Agana | 3/13/2015 |
| 671-482 | Agana | N/A |
| 671-483 | Agana | N/A |
| 671-484 | Agana | 2/18/2022 |
| 671-485 | Agana | 07/18/2023 |
| 671-486 | Agana | N/A |
| 671-487 | Agana | 5/7/2009 |
| 671-488 | Agana | 3/28/2002 |
| 671-489 | Agana | 9/7/2011 |
| 671-562 | Agana | N/A |
| 671-563 | Agana | N/A |
| 671-564 | Agana | N/A |
| 671-565 | Agana | N/A |
| 671-588 | Agana | 5/7/2009 |
| 671-632 | Agana | N/A |
| 671-633 | Agana | N/A |
| 671-634 | Agana | N/A |
| 671-635 | Agana | N/A |
| 671-637 | Agana | N/A |
| 671-638 | Agana | N/A |
| 671-642 | Agana | N/A |
| 671-644 | Agana | N/A |
| 671-645 | Agana | N/A |
| 671-646 | Agana | N/A |
| 671-647 | Agana | N/A |
| 671-648 | Agana | N/A |
| 671-649 | Agana | N/A |
| 671-653 | Agana | N/A |
| 671-654 | Agana | N/A |
| 671-678 | Agana | 5/17/2002 |
| 671-682 | Agana | 2/19/2016 |
| 671-683 | Agana | 2/26/2016 |
| 671-685 | Agana | 11/5/2009 |
| 671-686 | Agana | 11/20/2001 |
| 671-687 | Agana | N/A |
| 671-688 | Agana | N/A |
| 671-689 | Agana | N/A |
| 671-707 | Agana | 3/26/2009 |
| 671-726 | Agana | N/A |
| 671-727 | Agana | N/A |
| 671-734 | Agana | N/A |
| 671-735 | Agana | N/A |
| 671-747 | Agana | 2/23/2012 |
| 671-777 | Agana | 5/8/2001 |
| 671-787 | Agana | 6/13/2002 |
| 671-788 | Agana | N/A |
| 671-789 | Agana | N/A |
| 671-797 | Agana | 4/8/2009 |
| 671-828 | Agana | N/A |
| 671-838 | Agana | 8/25/2004 |
| 671-848 | Agana | 10/10/2008 |
| 671-858 | Agana | 10/10/2008 |
| 671-864 | Agana | N/A |
| 671-867 | Agana | 08/08/2024 |
| 671-868 | Agana | 3/10/2003 |
| 671-878 | Agana | 1/13/2005 |
| 671-888 | Agana | N/A |
| 671-898 | Agana | 8/24/2004 |
| 671-922 | Agana | 2/25/2003 |
| 671-929 | Agana | 4/9/2008 |
| 671-967 | Agana | 8/28/2009 |
| 671-969 | Agana | 1/8/2007 |
| 671-971 | Agana | 2/9/2011 |
| 671-972 | Agana | 2/10/2012 |
| 671-977 | Agana | 8/28/2009 |
| 671-979 | Agana | 9/3/2009 |
| 671-987 | Agana | 7/22/2005 |
| 671-988 | Agana | 3/4/2003 |
| 671-989 | Agana | 2/3/2010 |
| 671-997 | Agana | 3/30/2010 |
| 671-998 | Agana | 3/30/2010 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date. N/A - mostly central office codes assigned before 2001.
- NXX prefixes last updated: June 3, 2025
Cities in area code 671
| City1 | Time Zone1 |
|---|---|
| Agana Heights | ChST |
| Agat | ChST |
| Asan | ChST |
| Barrigada | ChST |
| Chalan Pago-Ordot | ChST |
| Dededo | ChST |
| Hagatna | ChST |
| Inarajan | ChST |
| Mangilao | ChST |
| Merizo | ChST |
| Mongmong-Toto-Maite | ChST |
| Piti | ChST |
| Santa Rita | ChST |
| Sinajana | ChST |
| Talofofo | ChST |
| Tamuning | ChST |
| Umatac | ChST |
| Yigo | ChST |
| Yona | ChST |
- Listed above are most places served by Guam area code 671. When multiple places share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- ChST stands for Chamorro Standard Time (currently ).