The article is based on the 2004 Census of the Republic of Moldova and the Governmental Center of State Informational Resources "Registru" of the Ministry of Informational Technology and Communication of the Republic of Moldova, which analyzes data on the basis of nationality and language. Such comparison revealed difference between declared and officially announced data. There is a big difference between the number of citizens who register themselves as Rumanians and the number of those who speak Rumanian and Russian. The data of the new governmental ministry 'Center of State Informational Resources "Registru"' are being included into scientific use.