* Patagonia is a vast region: It spans parts of Argentina and Chile, with diverse populations and languages.
* Language data is not always precise: There are no official, comprehensive surveys on language use in specific regions like Patagonia.
* Indigenous languages: Patagonia has a history of indigenous languages, like Mapuche, Tehuelche, and others, which may be spoken alongside Spanish.
However, we can say that Spanish is the dominant language in both Argentina and Chile, which are the countries where Patagonia is located. The majority of the population in both countries speaks Spanish.
Therefore, it's safe to assume that a large majority of people in Patagonia speak Spanish, although there will be some regional variations and some people may speak other languages as well.