Rioplatense is mainly based in the cities of Buenos Aires, Rosario, Santa Fe, La Plata, Mar del Plata and Baha Blanca in Argentina, the most populated cities in the dialectal area, along with their respective suburbs and the areas in between, and in all of Uruguay.

The most prevalent dialect in Argentina is Rioplatense, whose speakers are located primarily in the basin of the Ro de la Plata. There is also Cuyo Spanish and Cordobs Spanish. In the north, Andean Spanish is spoken and in the northeast there is a great influence from Paraguayan Spanish.