They constitute the fourth and final level of toponymy subdivisions of the Municipality of Rome and cover, considering only the areas within its competence, a surface of approximately 1,028 km2 (397 sq mi). The total resident population is 979,446 inhabitants.[1]
By resolution of the Special Commissioner Nr. 2453 dated 13 September 1961, due to the new urbanization, the entire area of the Ager Romanus falling in the Municipality of Rome was divided into 59 areas, coded with the letter Z followed by Roman numbers.
In 1992, with the constitution of the Municipality of Fiumicino,[2] six whole areas and part of three others were assigned to the new Municipality, then officially suppressed with resolution of the Special Commissioner Nr. 1529 of 8 September 1993.
The following table lists the 59 zones established in 1961.
Antonietta Brancati (1990). "La Cartografia dell'Agro Romano". Itinerari Didattici d'Arte e di Cultura. Rome: Palombi & Partner. ISSN0394-9753.
Comune di Roma, Ripartizione Antichità e Belle arti (1982–1988). Carta storica archeologica monumentale e paesistica del suburbio e dell'agro romano. Rome: Comune di Roma.
Maria Luisa Marchi; Fiorenzo Catalli (2008). Suburbio di Roma. Una residenza produttiva lungo la via Cornelia. Bari: Edipuglia. ISBN978-88-7228-494-0.
S. Mezzapesa (1962). Planimetria di Roma. Suburbio. Agro Romano (5 ed.). Rome: Istituto Cartografico Italiano. OCLC636568726.
Paolo Montanari (2009). Sepolcri circolari di Roma e suburbio. Elementi architettonici dell'elevato. Rome: Fabrizio Serra Editore. ISBN978-88-6227-198-1.