Prefix Information
The prefix 340 is part of area code 605 serving Sioux Falls, South Dakota.
This exchange contains 10,000 possible phone numbers (605-340-0000 through 605-340-9999).
Phone numbers with prefix 340 in area code 605. Location: Sioux Falls, South Dakota.
The prefix 340 is part of area code 605 serving Sioux Falls, South Dakota.
This exchange contains 10,000 possible phone numbers (605-340-0000 through 605-340-9999).