Symmetric DSL

Reading the FCC Numbers for Symmetric DSL

Symmetric DSL is classified by the FCC under technology code 20 in the Form 477 dataset, and nationwide it accounts for 45,070 deployment records. That makes it a moderately filed technology in the current dataset. Each record represents a single provider declaring it serves at least one location in a specific census block with this technology class, so the count reflects the combined geographic and operator footprint rather than the number of homes or businesses actively connected.

Because Symmetric DSL falls in the copper / DSL family, its filings cluster in the parts of the country where that underlying infrastructure exists. State pages on this site break down how the 45,070 records distribute geographically, and provider pages show which operators contribute the most filings for this technology code. Cross-referencing the two is the fastest way to see whether a given market has real competition on Symmetric DSL or whether one incumbent dominates the filings.

One important caveat when interpreting these numbers: Form 477 historically allowed providers to mark an entire census block as served if they could reach even one address in it, which inflates apparent coverage in sparsely populated blocks. The FCC's newer Broadband Data Collection tightens this, but Form 477 remains the largest historical record of U.S. broadband deployment. Treat Symmetric DSL record counts as a measure of where providers have declared capability, not as a guarantee of availability, speed, or price at any specific address.