Prefix Information

The prefix 991 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-991-0000 through 312-991-9999).

Browse Numbers in This Prefix

312-991-0000-0999 312-991-1000-1999 312-991-2000-2999 312-991-3000-3999 312-991-4000-4999 312-991-5000-5999 312-991-6000-6999 312-991-7000-7999 312-991-8000-8999 312-991-9000-9999

Sample Numbers

(312) 991-0000 (312) 991-1234 (312) 991-2000 (312) 991-3333 (312) 991-4444 (312) 991-5555 (312) 991-6000 (312) 991-7777 (312) 991-8888 (312) 991-9999