Prefix Information

The prefix 421 is part of area code 510 serving Oakland, California.

This exchange contains 10,000 possible phone numbers (510-421-0000 through 510-421-9999).

Browse Numbers in This Prefix

510-421-0000-0999 510-421-1000-1999 510-421-2000-2999 510-421-3000-3999 510-421-4000-4999 510-421-5000-5999 510-421-6000-6999 510-421-7000-7999 510-421-8000-8999 510-421-9000-9999

Sample Numbers

(510) 421-0000 (510) 421-1234 (510) 421-2000 (510) 421-3333 (510) 421-4444 (510) 421-5555 (510) 421-6000 (510) 421-7777 (510) 421-8888 (510) 421-9999