Prefix Information

The prefix 421 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-421-0000 through 312-421-9999).

Browse Numbers in This Prefix

312-421-0000-0999 312-421-1000-1999 312-421-2000-2999 312-421-3000-3999 312-421-4000-4999 312-421-5000-5999 312-421-6000-6999 312-421-7000-7999 312-421-8000-8999 312-421-9000-9999

Sample Numbers

(312) 421-0000 (312) 421-1234 (312) 421-2000 (312) 421-3333 (312) 421-4444 (312) 421-5555 (312) 421-6000 (312) 421-7777 (312) 421-8888 (312) 421-9999