Prefix Information
The prefix 603 is part of area code 346 serving Houston, Texas.
This exchange contains 10,000 possible phone numbers (346-603-0000 through 346-603-9999).
Phone numbers with prefix 603 in area code 346. Location: Houston, Texas.
The prefix 603 is part of area code 346 serving Houston, Texas.
This exchange contains 10,000 possible phone numbers (346-603-0000 through 346-603-9999).