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In page Demographics of Argentina:

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According to the data of INDEC's Complementary Survey of Indigenous Peoples (ECPI) 2004–2005, 600,000 officially recognized indigenous people (about 1.4% of the total population) reside in Argentina. The most numerous of these communities are the Mapuches, who live mostly in the south, the Kollas and Wichís, from the northwest, and the Guaranis and Qom, who live mostly in the northeast.[1] In the census of 2010, 955,032 people self recognized as indigenous or descendants of indigenous peoples, thus representing 2.4% of the national population. This is notwithstanding that more than half of the population has at least one indigenous ancestor, although in most cases family memory lost that origin.[citation needed]