Prefix Information
The prefix 691 is part of area code 641 serving Mason City, Iowa.
This exchange contains 10,000 possible phone numbers (641-691-0000 through 641-691-9999).
Phone numbers with prefix 691 in area code 641. Location: Mason City, Iowa.
The prefix 691 is part of area code 641 serving Mason City, Iowa.
This exchange contains 10,000 possible phone numbers (641-691-0000 through 641-691-9999).