Area Code 671-979 located in AGANA HEIGHTS, GUAM, GU, more detail is as below. Place NPA (Numbering Plan Area) : 671 NXX (Local Number Prefix) : 979 City : AGANA HEIGHTS County : GUAM State : GU (None) NXX Use Type : Landline NXX Intro Version : 9/3/2009 FIPS (Federal Information Processing Standards) : 66010 LATA (Local Access Transport Area) : 871 Rate Center : AGANA ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 96919 Other Information NPANXX : 671979 Time Zone : Guam (GMT +10:00) Observes Daylight Saving Time : No Company : IT&E OVERSEAS, INC. - GU OCN (Operating Company Number) : 335E Coverage Area Name : AGANA HEIGHTS Latitude : 13.4630 Longitude : -144.7435 ‹ previous : 671-977 next › : 671-987 Telephone Number List 671-979-0000 ~ 671-979-9999