Akodon spegazzinii is found in northwestern Argentina, in the provinces of Salta, Catamarca, Tucumán, La Rioja, and Mendoza, at altitudes of . Although its main distribution is in the northern provinces of Salta, Tucumán, and Catamarca, there are also scattered records from the more southern provinces of La Rioja and Mendoza, where it is likely restricted to patches of wet habitat. "Akodon alterus" has been reported from Jujuy, but this record was likely based on misidentified specimens of "A. boliviensis", and records of "Akodon spegazzinii" from Jujuy were based on misidentified "A. sylvanus". "Akodon spegazzinii" is known from a paleontological site in
Formosa, Goiás information about tourist sites is from the Prefeitura de Formosa Lagoa Feia means "ugly lake" in Portuguese. Located four kilometers from the center of the town, the Preto River, which flows south into the São Francisco, begins here. The south bank is part of an army base which is used for field training. This cave, called Hole of the Macaws, is 41 kilometers from Formosa, following BR-20 north as far as the village of Bezerra. The cave is located in the middle of a flat landscape with scarce vegetation. One may see high trees and a river which forms a