Prefix Information

The prefix 204 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-204-0000 through 312-204-9999).

Browse Numbers in This Prefix

312-204-0000-0999 312-204-1000-1999 312-204-2000-2999 312-204-3000-3999 312-204-4000-4999 312-204-5000-5999 312-204-6000-6999 312-204-7000-7999 312-204-8000-8999 312-204-9000-9999

Sample Numbers

(312) 204-0000 (312) 204-1234 (312) 204-2000 (312) 204-3333 (312) 204-4444 (312) 204-5555 (312) 204-6000 (312) 204-7777 (312) 204-8888 (312) 204-9999