All facilities-based broadband providers are required to file data with the FCC twice a year (Form 477) on where they offer Internet access service at speeds exceeding 200 kbps in at least one direction. This includes fixed providers and mobile providers. Fixed providers file lists of census blocks in which they can or do offer service to at least one location, with additional information about the service. Mobile providers file maps of their coverage areas for each broadband technology (e.g., EV-DO, HSPA, LTE).
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For form 477 Resources click here.