NPA-NXX - 303-656

This is the 303-656 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 303
3. 303-656

The 303-656 subcode mainly covers Denver in Denver county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Colorado state. Many of the numbers in this subcode are Regular Landline registered to Big River Telephone. We hear they employ a large number of people in the Colorado office.
Recently there have been an increase in reported calls, we've had over 600158 comments across our systems for the 303-656 subcode.