Prefix Information

The prefix 231 is part of area code 650 serving San Mateo, California.

This exchange contains 10,000 possible phone numbers (650-231-0000 through 650-231-9999).

Browse Numbers in This Prefix

650-231-0000-0999 650-231-1000-1999 650-231-2000-2999 650-231-3000-3999 650-231-4000-4999 650-231-5000-5999 650-231-6000-6999 650-231-7000-7999 650-231-8000-8999 650-231-9000-9999

Sample Numbers

(650) 231-0000 (650) 231-1234 (650) 231-2000 (650) 231-3333 (650) 231-4444 (650) 231-5555 (650) 231-6000 (650) 231-7777 (650) 231-8888 (650) 231-9999