Prefix Information

The prefix 123 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-123-0000 through 312-123-9999).

Browse Numbers in This Prefix

312-123-0000-0999 312-123-1000-1999 312-123-2000-2999 312-123-3000-3999 312-123-4000-4999 312-123-5000-5999 312-123-6000-6999 312-123-7000-7999 312-123-8000-8999 312-123-9000-9999

Sample Numbers

(312) 123-0000 (312) 123-1234 (312) 123-2000 (312) 123-3333 (312) 123-4444 (312) 123-5555 (312) 123-6000 (312) 123-7777 (312) 123-8888 (312) 123-9999