We were at the tail end of Cicada 2021 season so we only go a day of the noice but we saw the masses of dead Cicadas all around the Mall. The noise was not loud but crazy nonetheless.
Seems the ones in DC are the Magiciada
One exclusively North American genus, Magicicada (the periodical cicadas), which spend most of their lives as underground nymphs, emerge in predictable intervals of 13 or 17 years, depending on the species and the location. The unusual duration and synchronization of their emergence may reduce the number of cicadas lost to predation, both by making them a less reliably available prey (so that any predator that evolved to depend on cicadas for sustenance might starve waiting for their emergence), and by emerging in such huge numbers that they will sate any remaining predators before losing enough of their number to threaten their survival as a species.