Drones are promising transport means for the last-mile deliveries in urban communities. However, low-altitude aviation can cause severe noise pollution, leading to the requirement of rational operational strategies to minimize noise emissions. In this work, the noise impact on an urban community of delivery drones is assessed using a virtual flight platform that contains noise generation and projection modules. Both the tonal and broadband noise components are taken into account via analytical and semi-empirical prediction methods, and the noise propagation in the urban environment is computed by an efficient Gaussian beam tracing method.