Where is 671 area code? 

671 – Guam

What area code is 671

Guam is the southernmost island of Micronesia and belongs to the territory of the United States.

The largest island of the Mariana archipelago, with 544 square kilometres, is located in the western Pacific Ocean and is inhabited by almost 180,000 people. The Guam, which belongs to the outer regions of the USA, is geographically assigned to the island region of Micronesia. The island is located about 2,500 kilometers south of Japan, 2,400 kilometers east of the Philippines and about 5,300 kilometers west of Hawaii.