The Form 477 filing interface is open! The new filing deadline for data as of June 30, 2021 is September 15, 2021 and for filers in Louisiana and Mississippi affected by Hurricane Ida, the new filing deadline is October 1, 2021. 


  • New Login:  A CORES Username and Password are required to log in to the Form 477 filing interface. For info on getting a CORES username and password, click here and for a preview of the new login procedure, click here.
  • Where's my FRN?:  If you log into the Form 477 filing interface and don't see your FRN(s) listed in the drop-down box but have already associated the FRN(s) with you CORES username, please send an email containing your CORES username and FRN to
  • Mobile Deployment Maps:  All geometries must be well-formed in 2D according to the OGC (Open Geospatial Consortium) rules. Invalid geometries will be reported to the user, but maps containing invalid geometries will not be accepted by the system. Please see our voice & broadband tip sheets for more info.  If you have questions, please email
  • Census Geography Codes:  You must continue to use Census 2010 geographic codes in FCC Form 477 until further notice.  We cannot switch to 2020 codes until more detailed data are available in 2020 geographies.
  • Does FCC Form 477 = Broadband Data Collection?  Not exactly. The two collections are related, but different.  Please see the Broadband Data Collection page for more info.

Filing Form 477:

Instructions, Guides & FAQs:

Geographical Resources:

Data & Reports:

Orders and Releases:

Need Help or Have Form 477 Questions:
Email or call 202-418-0940.



Monday, September 13, 2021