Long range wireless communication has become a very suitable candidate technology for data transmission in some scenarios of Internet of Things (IoT), due mainly to its long-range capacity and energy efficiency. However, its application to cover large surfaces, such as small or medium sized cities, has not been deeply investigated and presents uncertainties in terms of performance, cost, and coverage. In this sense, one of the fundamental processes in the design of the network is its planning and simulation before the physical deployment on the surface to be covered. This work proposes to bridge this gap by means of the development of a simulator called LoRaCity, based on LoRa technology, that allows to evaluate a variety of LoRa network configurations on the map of the city that is intended to cover, and whose simulation results may support the process of planing these networks over medium and large areas.