Prefix Information
The prefix 311 is part of area code 713 serving Houston, Texas.
This exchange contains 10,000 possible phone numbers (713-311-0000 through 713-311-9999).
Phone numbers with prefix 311 in area code 713. Location: Houston, Texas.
The prefix 311 is part of area code 713 serving Houston, Texas.
This exchange contains 10,000 possible phone numbers (713-311-0000 through 713-311-9999).