Ancestry.com. Argentina, National Census, 1869 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.Original data: Argentina National Census, 1869. Salt Lake City, Utah: FamilySearch, 2013.
About Argentina, National Census, 1869
This collection includes images and indexes for the first national census of the population of Argentina, in 1869.
You can learn more about this collection at the FamilySearch website.