Prefix Information

The prefix 431 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-431-0000 through 312-431-9999).

Browse Numbers in This Prefix

312-431-0000-0999 312-431-1000-1999 312-431-2000-2999 312-431-3000-3999 312-431-4000-4999 312-431-5000-5999 312-431-6000-6999 312-431-7000-7999 312-431-8000-8999 312-431-9000-9999

Sample Numbers

(312) 431-0000 (312) 431-1234 (312) 431-2000 (312) 431-3333 (312) 431-4444 (312) 431-5555 (312) 431-6000 (312) 431-7777 (312) 431-8888 (312) 431-9999