Junín, city, northern Buenos Aires provincia (province), east-central Argentina. It is located in the Pampa on the Salado River.
The town grew up around Fort (Fuerte) Federación, founded in 1827 to protect colonists from Indian incursions; it was given city status in 1906. Junín is an agricultural (wheat, corn [maize], cattle), commercial, and manufacturing centre. It has railway workshops, breweries, and factories producing ceramics, furniture, and metal goods. Fish from nearby lagoons are sent to markets in Buenos Aires, 150 miles (240 km) to the east. Eva Perón was born at the settlement of Los Toldos, south of Junín. Pop. (2001) 82,427; (2010 est.) 84,000.