Prefix Information

The prefix 100 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-100-0000 through 312-100-9999).

Browse Numbers in This Prefix

312-100-0000-0999 312-100-1000-1999 312-100-2000-2999 312-100-3000-3999 312-100-4000-4999 312-100-5000-5999 312-100-6000-6999 312-100-7000-7999 312-100-8000-8999 312-100-9000-9999

Sample Numbers

(312) 100-0000 (312) 100-1234 (312) 100-2000 (312) 100-3333 (312) 100-4444 (312) 100-5555 (312) 100-6000 (312) 100-7777 (312) 100-8888 (312) 100-9999