Prefix Information

The prefix 770 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-770-0000 through 312-770-9999).

Browse Numbers in This Prefix

312-770-0000-0999 312-770-1000-1999 312-770-2000-2999 312-770-3000-3999 312-770-4000-4999 312-770-5000-5999 312-770-6000-6999 312-770-7000-7999 312-770-8000-8999 312-770-9000-9999

Sample Numbers

(312) 770-0000 (312) 770-1234 (312) 770-2000 (312) 770-3333 (312) 770-4444 (312) 770-5555 (312) 770-6000 (312) 770-7777 (312) 770-8888 (312) 770-9999