Prefix Information

The prefix 521 is part of area code 815 serving Rockford, Illinois.

This exchange contains 10,000 possible phone numbers (815-521-0000 through 815-521-9999).

Browse Numbers in This Prefix

815-521-0000-0999 815-521-1000-1999 815-521-2000-2999 815-521-3000-3999 815-521-4000-4999 815-521-5000-5999 815-521-6000-6999 815-521-7000-7999 815-521-8000-8999 815-521-9000-9999

Sample Numbers

(815) 521-0000 (815) 521-1234 (815) 521-2000 (815) 521-3333 (815) 521-4444 (815) 521-5555 (815) 521-6000 (815) 521-7777 (815) 521-8888 (815) 521-9999