Prefix Information

The prefix 631 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-631-0000 through 312-631-9999).

Browse Numbers in This Prefix

312-631-0000-0999 312-631-1000-1999 312-631-2000-2999 312-631-3000-3999 312-631-4000-4999 312-631-5000-5999 312-631-6000-6999 312-631-7000-7999 312-631-8000-8999 312-631-9000-9999

Sample Numbers

(312) 631-0000 (312) 631-1234 (312) 631-2000 (312) 631-3333 (312) 631-4444 (312) 631-5555 (312) 631-6000 (312) 631-7777 (312) 631-8888 (312) 631-9999