New York's Health Department has an interactive series of maps on a site known as Rat Information Portal. The maps cover the city by area and blocks in red have the most rat infestations. Residents can view the rat infestation of individual buildings and find out if any actions have been taken.
Rats are really nothing to joke about and while these maps can give us shivers, these rodents are in every city. I wonder if other cities share this level of information.