[1] On 11 March 2013, Rome City Council decided to merge some of the municipi, reducing their number to 15 and giving them a new numeration.

[2] For the current legislature (2021–2026), presidents of Rome's municipi are: The comune of Rome is also composed of 155 urban zones (zone urbanistiche), conceived as a subdivision of the municipi, which were established in 1977 for statistical and city planning purposes on the basis of urban homogeneity criteria.

Boundaries were drafted taking account of the discontinuities in Rome's urban pattern The urban zones are identified by an alphanumeric code that consists of a letter and of the number of the municipio where the zone was located: indeed, the municipi were reduced from 20 to 15 in 2013, but the alphanumeric codes were not revised.

Today all the rioni are part of the first Municipio, which therefore coincides completely with the historical city (Centro Storico).

[citation needed] There are currently 6 suburbi with a discontinuous numbering, since some of the original suburbs were established as quartieri in 1961, following to the urban development of the city.