Prefix Information

The prefix 821 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-821-0000 through 312-821-9999).

Browse Numbers in This Prefix

312-821-0000-0999 312-821-1000-1999 312-821-2000-2999 312-821-3000-3999 312-821-4000-4999 312-821-5000-5999 312-821-6000-6999 312-821-7000-7999 312-821-8000-8999 312-821-9000-9999

Sample Numbers

(312) 821-0000 (312) 821-1234 (312) 821-2000 (312) 821-3333 (312) 821-4444 (312) 821-5555 (312) 821-6000 (312) 821-7777 (312) 821-8888 (312) 821-9999