Prefix Information
The prefix 820 is part of area code 406 serving Billings, Montana.
This exchange contains 10,000 possible phone numbers (406-820-0000 through 406-820-9999).
Phone numbers with prefix 820 in area code 406. Location: Billings, Montana.
The prefix 820 is part of area code 406 serving Billings, Montana.
This exchange contains 10,000 possible phone numbers (406-820-0000 through 406-820-9999).