Prefix Information
The prefix 604 is part of area code 303 serving Denver, Colorado.
This exchange contains 10,000 possible phone numbers (303-604-0000 through 303-604-9999).
Phone numbers with prefix 604 in area code 303. Location: Denver, Colorado.
The prefix 604 is part of area code 303 serving Denver, Colorado.
This exchange contains 10,000 possible phone numbers (303-604-0000 through 303-604-9999).