The city of Yerba Buena is the department seat and the most urbanized area as well. It is mostly residential, though an always-increasing commercial activity can be observed along its main road: Aconquija Avenue. Different kind of stores, shopping arcades, restaurants, bars and cafés line along this avenue giving the area a very lively atmosphere, especially on weekends, when yerbabuenenses and people from its neighbouring cities gather in search of fun and relaxation.
Yerba Buena is home to most of the country clubs and gated communities in the province. However, some of its residents live in slums scattered around the city.
Yerba Buena is a city, possibly given its name because people there may be friendly. There is a place called San Javier in the mountains nearby where there is a large cross called "El Cruz" (the cross). Yerba Buena has experienced more growth than any other Argentine city since 1996 with an average of two residences per day being constructed
