Prefix Information

The prefix 623 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-623-0000 through 312-623-9999).

Browse Numbers in This Prefix

312-623-0000-0999 312-623-1000-1999 312-623-2000-2999 312-623-3000-3999 312-623-4000-4999 312-623-5000-5999 312-623-6000-6999 312-623-7000-7999 312-623-8000-8999 312-623-9000-9999

Sample Numbers

(312) 623-0000 (312) 623-1234 (312) 623-2000 (312) 623-3333 (312) 623-4444 (312) 623-5555 (312) 623-6000 (312) 623-7777 (312) 623-8888 (312) 623-9999