631-428 Prefix — Ronkonkoma, New York

Phone numbers starting with 631-428 are based in Ronkonkoma, New York, primarily served by T-Mobile.

Recently looked-up numbers in 631-428

• 631-428-3486
• 631-428-7123

More about this region

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

Last updated: June 17, 2026