Prefix Information

The prefix 378 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-378-0000 through 312-378-9999).

Browse Numbers in This Prefix

312-378-0000-0999 312-378-1000-1999 312-378-2000-2999 312-378-3000-3999 312-378-4000-4999 312-378-5000-5999 312-378-6000-6999 312-378-7000-7999 312-378-8000-8999 312-378-9000-9999

Sample Numbers

(312) 378-0000 (312) 378-1234 (312) 378-2000 (312) 378-3333 (312) 378-4444 (312) 378-5555 (312) 378-6000 (312) 378-7777 (312) 378-8888 (312) 378-9999