Prefix Information

The prefix 423 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-423-0000 through 312-423-9999).

Browse Numbers in This Prefix

312-423-0000-0999 312-423-1000-1999 312-423-2000-2999 312-423-3000-3999 312-423-4000-4999 312-423-5000-5999 312-423-6000-6999 312-423-7000-7999 312-423-8000-8999 312-423-9000-9999

Sample Numbers

(312) 423-0000 (312) 423-1234 (312) 423-2000 (312) 423-3333 (312) 423-4444 (312) 423-5555 (312) 423-6000 (312) 423-7777 (312) 423-8888 (312) 423-9999