Prefix Information

The prefix 331 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-331-0000 through 312-331-9999).

Browse Numbers in This Prefix

312-331-0000-0999 312-331-1000-1999 312-331-2000-2999 312-331-3000-3999 312-331-4000-4999 312-331-5000-5999 312-331-6000-6999 312-331-7000-7999 312-331-8000-8999 312-331-9000-9999

Sample Numbers

(312) 331-0000 (312) 331-1234 (312) 331-2000 (312) 331-3333 (312) 331-4444 (312) 331-5555 (312) 331-6000 (312) 331-7777 (312) 331-8888 (312) 331-9999