Prefix Information

The prefix 257 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-257-0000 through 312-257-9999).

Browse Numbers in This Prefix

312-257-0000-0999 312-257-1000-1999 312-257-2000-2999 312-257-3000-3999 312-257-4000-4999 312-257-5000-5999 312-257-6000-6999 312-257-7000-7999 312-257-8000-8999 312-257-9000-9999

Sample Numbers

(312) 257-0000 (312) 257-1234 (312) 257-2000 (312) 257-3333 (312) 257-4444 (312) 257-5555 (312) 257-6000 (312) 257-7777 (312) 257-8888 (312) 257-9999