Prefix Information

The prefix 303 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-303-0000 through 312-303-9999).

Browse Numbers in This Prefix

312-303-0000-0999 312-303-1000-1999 312-303-2000-2999 312-303-3000-3999 312-303-4000-4999 312-303-5000-5999 312-303-6000-6999 312-303-7000-7999 312-303-8000-8999 312-303-9000-9999

Sample Numbers

(312) 303-0000 (312) 303-1234 (312) 303-2000 (312) 303-3333 (312) 303-4444 (312) 303-5555 (312) 303-6000 (312) 303-7777 (312) 303-8888 (312) 303-9999