It comprises 48 legislators elected in a single multi-member province-wide district through proportional representation using the D'Hondt method.

Since 2015, Carlos Haquim of the Cambia Jujuy coalition, elected alongside Gerardo Morales, has been vice governor and president of the Legislature.

This first "Honourable General Constituent Junta of the Free and Independent Province of Jujuy" comprised 13 deputies: four for the city of San Salvador, and one for each of the remaining eight departments of the province at the time (Tumbaya, Humahuaca, Yavi, Santa Catalina, Cochinoca, Rinconada, Perico, and Río Negro).

Constitutional reforms would take place in 1839, 1851, and 1935, but they did not alter the province's electoral system and the legal framework wherein the legislature operated.

[5] In 1949, during the first presidency of Juan Perón, a new provincial constitution was adopted and for the first time the simple plurality system in a single province-wide district was employed to elect members to the Legislature.