Prefix Information

The prefix 644 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-644-0000 through 312-644-9999).

Browse Numbers in This Prefix

312-644-0000-0999 312-644-1000-1999 312-644-2000-2999 312-644-3000-3999 312-644-4000-4999 312-644-5000-5999 312-644-6000-6999 312-644-7000-7999 312-644-8000-8999 312-644-9000-9999

Sample Numbers

(312) 644-0000 (312) 644-1234 (312) 644-2000 (312) 644-3333 (312) 644-4444 (312) 644-5555 (312) 644-6000 (312) 644-7777 (312) 644-8888 (312) 644-9999