Prefix Information

The prefix 121 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-121-0000 through 312-121-9999).

Browse Numbers in This Prefix

312-121-0000-0999 312-121-1000-1999 312-121-2000-2999 312-121-3000-3999 312-121-4000-4999 312-121-5000-5999 312-121-6000-6999 312-121-7000-7999 312-121-8000-8999 312-121-9000-9999

Sample Numbers

(312) 121-0000 (312) 121-1234 (312) 121-2000 (312) 121-3333 (312) 121-4444 (312) 121-5555 (312) 121-6000 (312) 121-7777 (312) 121-8888 (312) 121-9999