The Form 477 Filing Interface is now available!


  • Census Geography Codes:  2020 Census geography codes must be used when you’re creating and filing your data as of December 31, 2021 (due March 1, 2022).  To ease revisions, filings of data as of June 30, 2021 and before will continue to rely on 2010 Census codes.
    • FCC Census Block API: The FCC's Census Block API is currently down for maintenance but will be back soon. The Census Bureau's Geocoding API offers the same functionality and more. It can return 2010 or 2020 geographies and has additional features. 
  • 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
  • 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.



Wednesday, January 5, 2022