Prefix Information
The prefix 621 is part of area code 231 serving Muskegon, Michigan.
This exchange contains 10,000 possible phone numbers (231-621-0000 through 231-621-9999).
Phone numbers with prefix 621 in area code 231. Location: Muskegon, Michigan.
The prefix 621 is part of area code 231 serving Muskegon, Michigan.
This exchange contains 10,000 possible phone numbers (231-621-0000 through 231-621-9999).