Prefix Information

The prefix 604 is part of area code 331 serving Aurora, Illinois.

This exchange contains 10,000 possible phone numbers (331-604-0000 through 331-604-9999).

Browse Numbers in This Prefix

331-604-0000-0999 331-604-1000-1999 331-604-2000-2999 331-604-3000-3999 331-604-4000-4999 331-604-5000-5999 331-604-6000-6999 331-604-7000-7999 331-604-8000-8999 331-604-9000-9999

Sample Numbers

(331) 604-0000 (331) 604-1234 (331) 604-2000 (331) 604-3333 (331) 604-4444 (331) 604-5555 (331) 604-6000 (331) 604-7777 (331) 604-8888 (331) 604-9999