The city is subdivided into 22 zones ("Zonas") designed by the urban engineering of Raúl Aguilar Batres, each one with its own streets ("Calles"). avenues ("Avenidas") and sometimes "Diagonal" Streets, making it pretty easy to find addresses in the city. Zones are numbered 1–25 with Zones 20, 22 and 23 not existing as they would have fallen in two other municipalities' territory. Addresses are assigned according to the street or avenue number, followed by a dash and the number of metres it is away from the intersection.