Prefix Information
The prefix 340 is part of area code 904 serving Jacksonville, Florida.
This exchange contains 10,000 possible phone numbers (904-340-0000 through 904-340-9999).
Phone numbers with prefix 340 in area code 904. Location: Jacksonville, Florida.
The prefix 340 is part of area code 904 serving Jacksonville, Florida.
This exchange contains 10,000 possible phone numbers (904-340-0000 through 904-340-9999).