Prefix Information
The prefix 603 is part of area code 510 serving Oakland, California.
This exchange contains 10,000 possible phone numbers (510-603-0000 through 510-603-9999).
Phone numbers with prefix 603 in area code 510. Location: Oakland, California.
The prefix 603 is part of area code 510 serving Oakland, California.
This exchange contains 10,000 possible phone numbers (510-603-0000 through 510-603-9999).