Iquitos is one of the most important cities in the Peruvian Amazon. It is well-known around the world for tourism, scientific research and cultural attractions. One challenge is assuring the sustainability of urban trees. This encourages the general goal of maintaining a balanced variety of urban structures and park areas with trees. This paper considers techniques for measuring the amount of urban forest in the monumental areas, using the Forest Value Index, Simpson index, Shannon-Wiener index, coefficient of Sorensen similarity and Cox index and create an urban forestry diagnosis. Most of the species growing alongside the streets are Terminalia catappa, Ficus benjamina and Syzygium malasccense. According to Forest Value Index most of the urban parks contain over 50% Couepia subcordata, Pritchardia hardyi, Syzygium malasccense species. Simpson dominance is low with values of SI’=0.155...