The NYCounterPOPdV2 software is an interactive application used to explore the differences in population dynamics in the presence and absence of lead (Pb) in bald eagles in New York state between 1990 and 2018. Comparisons include a factual (Pb) scenario (“Actual”), a counter factual scenarios where lead poisoning cases did not exist (“Pb-reduced”), and counter factual scenario where lead exposure cases did not exist (“Pb-free”). All data was collected by the New York State Department of Environmental Conservation, and these data collapse via an algorithm into several comparative population scale properties, including the life tables, annual abundances (January – December), bi-annual abundances (January – June and July – December), bi-annual hatchling abundances, bi-annual immature and non-breeder adult abundances, bi-annual breeder abundances, abundances during the breeding periods (January – June), abundances during the non-breeding periods (July – December), migration and dispersal values, lambda values, survival rates, stable stage distributions, reproductive values, elasticities, cumulative growth rates, stochastic growth rates, transient growth rates, reactivity, maximum amplifications, and maximum attenuations (Caswell 2001). The summarized data appears for immediate use in this packet. The raw data may be obtained by contacting the Wildlife Health Unit at the New York State Department of Environmental Conservation [wildlife@dec.ny.gov or (518) 478-2203].