The area code 671 is located in Hagatna, Guam.
Area code 671 covers the entire island of Guam, including the capital, Hagåtña (Hagatna), in the western Pacific. As part of the North American Numbering Plan (NANP), Guam’s phone numbers work like U.S. numbers, making 671 a key link between Micronesia and the mainland. Located in Chamorro Standard Time (UTC+10), Hagåtña is the historic center of government and culture, known for its Spanish-era sites and coastal views. Fun fact: Hagåtña was formerly called Agana, reflecting Guam’s layered history.
This single Guam area code serves every village and major landmark on the island. Key places covered by 671 include:
Established: 1997, when Guam joined the NANP. From the U.S. and Canada, dial 1 + 671 + seven-digit number; internationally, use +1 671. The code replaced Guam’s old stand-alone international identity and aligned the island with U.S.-style dialing. Its broad coverage makes 671 the go-to identifier for Guam phone numbers, whether you’re calling government offices in Hagåtña, a hotel in Tumon, or the university in Mangilao.
“Guam’s population was 153,836 in 2020.” — U.S. Census Bureau (2020)