Prefix Information

The prefix 550 is part of area code 312 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (312-550-0000 through 312-550-9999).

Browse Numbers in This Prefix

312-550-0000-0999 312-550-1000-1999 312-550-2000-2999 312-550-3000-3999 312-550-4000-4999 312-550-5000-5999 312-550-6000-6999 312-550-7000-7999 312-550-8000-8999 312-550-9000-9999

Sample Numbers

(312) 550-0000 (312) 550-1234 (312) 550-2000 (312) 550-3333 (312) 550-4444 (312) 550-5555 (312) 550-6000 (312) 550-7777 (312) 550-8888 (312) 550-9999