Prefix Information
The prefix 121 is part of area code 314 serving St. Louis, Missouri.
This exchange contains 10,000 possible phone numbers (314-121-0000 through 314-121-9999).
Phone numbers with prefix 121 in area code 314. Location: St. Louis, Missouri.
The prefix 121 is part of area code 314 serving St. Louis, Missouri.
This exchange contains 10,000 possible phone numbers (314-121-0000 through 314-121-9999).