631-639 Prefix — Ronkonkoma, New York

Phone numbers starting with 631-639 are based in Ronkonkoma, New York, primarily served by T-Mobile.

Recently looked-up numbers in 631-639

• 631-639-5830

More about this region

Area code 631 directory · About area code 631 · Get a NY phone number

Last updated: June 17, 2026