Prefix Information

The prefix 870 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-870-0000 through 312-870-9999).

Browse Numbers in This Prefix

312-870-0000-0999 312-870-1000-1999 312-870-2000-2999 312-870-3000-3999 312-870-4000-4999 312-870-5000-5999 312-870-6000-6999 312-870-7000-7999 312-870-8000-8999 312-870-9000-9999

Sample Numbers

(312) 870-0000 (312) 870-1234 (312) 870-2000 (312) 870-3333 (312) 870-4444 (312) 870-5555 (312) 870-6000 (312) 870-7777 (312) 870-8888 (312) 870-9999