Area code 603

Largest exchanges

• Manchester80
• Nashua58
• Concord39
• Derry29
• Dover29
• Portsmouth28
• Merrimack23
• Salem20
• Laconia19
• Keene17

Largest carriers

• Consolidated Comm Of No. New England-nh246
• Bell Atlantic Mobile, INC74
• Paetec Itel, LLC58
• Mcimetro Access Transmission Services LLC - Nh44
• Comcast IP Phone, LLC40
• Omnipoint Miami E License, LLC38
• United States Cellular - Nh37
• Level 3 Communications, LLC - Nh37
• New Cingular Wireless Pcs, LLC - Dc34
• Freedom Ring Communications, LLC32

Most reported 603 numbers

No visitor reports yet in this area code.

FCC complaints

• 603-202-46981 · 2026-10-06