The last format (used between 1982 and 2000) was A 123456, where the letter represented the department (with the exception of those patented in Asunción, which consisted only of numbers).
Some municipalities of the Interior inscribed their coat of arms and/or "motto" on the license plate (e.g.: "Capital of Energy" for the district of Hernandarias, Alto Paraná).
The license plates for special vehicles both in the interior and in the capital (e.g., state, municipal, diplomatic, judicial or other authorities) were of a different format than the general one.
In the case of Asunción, for private vehicles the plate format only had numbers inscribed in white, and the background was blue; in addition to including the name of the municipality with the country and the last two digits of the year of the patent (sometimes registered by the license plate itself, or otherwise affixed by seal).
Public transport vehicles (collective) and taxis had red bottom plates with white numbers.
In the early 1960s, the interior license plates changed the background to white with red inscriptions (used until today), as they previously had no fixed design.
(Being "C" the category of the vehicle, "11" the department number by order -in this case corresponding to the Central department-, and 3726 the serial of the lock).
[5] To put an end to the business of "mau" cars (smuggling) -under pressure from its Mercosur partners-, and unify at the national level in a single system the vehicles registered in the country, since previously was registered by each municipality, in the 1990s a new, safer and more permanent patenting system began to be projected (until the end of the vehicle's useful life).
This system has replaced the previous format, in which the plates were issued by the municipal authorities, but which still maintain local records and collect the respective taxes.
The "Exx nnn" series is (originally) reserved for public (state) vehicles that are exempt from taxes (although these can be sold to private individuals and cease to be state-owned).
License plates for diplomats have another format different from the general one, with a black background and white inscriptions, made up of letters and 6 numbers.
In October 2014, in the Salón Libertador of the Palacio San Martín in Buenos Aires, the new Unique Mercosur Patent was presented.
[8] In Paraguay, the registration of 0 km vehicles should have been mandatory since the beginning of 2016, while the reregistration of used cars would be progressive but initially optional, but it was postponed on several occasions.
[2] This new license plate, which will be used in the member countries of MERCOSUR, will have the following common characteristics: As of May 31, 2019, 2,326,335 vehicles of all kinds have been registered.