The figures that had been already collected but not reported during this period were eventually published in 1937, although this activity was ceased only two years afterwards.

After the outbreak of the Second World War, publications decreased due to the lack of personnel, most of whom had been called up for military service.

Due to the Armistice of Cassibile in 1943, the institute headquarters were relocated within the territory of the Italian Social Republic.

[3] During the late 1940s, the archives were recovered and transferred back to Rome, allowing the institute to fully resume its activities.

322, published on 6 September, 1989, established the National Statistics System (Sistema statistico nazionale, Sistan) and changed the name of the institution to the National Institute of Statistics (Istituto nazionale di statistica), without changing its acronym, which remained Istat.