Unión is based in Santa Fe, Argentina, while Atlético Tucumán is based in Tucumán, Argentina.
Unión was founded in 1907, while Atlético Tucumán was founded in 1902.
Unión's home stadium is the Estadio 15 de Abril, which has a capacity of 26,453 spectators. Atlético Tucumán's home stadium is the Estadio Monumental José Fierro, which has a capacity of 35,200 spectators.
Unión's nickname is "El Tatengue", while Atlético Tucumán's nickname is "El Decano".
Unión's most successful period was in the early 1970s when they won two Argentine Primera Division titles. Atlético Tucumán's most successful period was in the 2010s when they won their first Primera Division title in 2018.
Unión and Atlético Tucumán have a historical rivalry known as the "Clásico Tucumano", which is considered one of the most intense derbies in Argentine football.