Prefix Information

The prefix 503 is part of area code 773 serving Chicago, Illinois.

This exchange contains 10,000 possible phone numbers (773-503-0000 through 773-503-9999).

Browse Numbers in This Prefix

773-503-0000-0999 773-503-1000-1999 773-503-2000-2999 773-503-3000-3999 773-503-4000-4999 773-503-5000-5999 773-503-6000-6999 773-503-7000-7999 773-503-8000-8999 773-503-9000-9999

Sample Numbers

(773) 503-0000 (773) 503-1234 (773) 503-2000 (773) 503-3333 (773) 503-4444 (773) 503-5555 (773) 503-6000 (773) 503-7777 (773) 503-8888 (773) 503-9999