Home / Area 203 / Prefix 603
Prefix Lookup

(203) 603 Phone Number Lookup

Research phone numbers under this exchange in New Haven, Connecticut. Review carrier details, activity signals, and community caller feedback.

231number listings
0caller reports
13lookup pages

Phone Numbers in This Prefix

Browse numbers in this exchange and open any listing to view caller details, spam signals, and community feedback. Showing 217–231 of 231 listings for this prefix.

Frequently searched Landline

(203) 603-3405

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
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Frequently searched Landline

(203) 603-3425

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3445

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3465

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3485

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3505

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3525

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3545

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3565

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3585

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3605

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3625

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3645

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3665

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3685

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3705

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3725

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing
Frequently searched Landline

(203) 603-3745

New Haven, Connecticut

  • Carrier: Southern New England Telephone Co.
  • Exchange: 203-603
  • Report type: Reverse lookup profile
View listing

About this prefix

Area code 203 prefix 603 is organized as a reverse lookup section for New Haven, Connecticut. The page combines location metadata, carrier information, line type, number listings, and community activity in one place.

Public URLs use the exchange format 203-603, while each listing still maps back to the correct area code and prefix structure.