 In terms of second-level political divisions there are 2,438 municipalities and Mexico and 16 semi-autonomous boroughs (all within the Federal District).A municipality can be constituted by one or more cities one of which is the "cabecera municipal" (municipal seat).Cities are usually contained within the limits of a single municipality, with a few exceptions in which small areas of one city may extend to other adjacent municipalities "without" incorporating the city which serves as the municipal seat of the adjacent municipality.