Prefix Information
The prefix 300 is part of area code 858 serving San Diego, California.
This exchange contains 10,000 possible phone numbers (858-300-0000 through 858-300-9999).
Phone numbers with prefix 300 in area code 858. Location: San Diego, California.
The prefix 300 is part of area code 858 serving San Diego, California.
This exchange contains 10,000 possible phone numbers (858-300-0000 through 858-300-9999).