Form 477 is currently the primary reporting tool that the FCC uses in order to determine where providers offer their services in the United States. Providers are required to report their coverage information using Form 477 twice a year.
Currently, Form 477 counts an entire census block as “covered” if as little as one address in that area is serviced by a provider. That said, it remains the most comprehensive raw look into the state of broadband deployment in America today. The map above is our attempt to improve upon this baseline.