San Isidro is a town in Catamarca Province, Argentina.

It is the head town of the Valle Viejo Department.

It forms part of the Gran San Fernando del Valle de Catamarca urban agglomeration.

Municipal information: Municipal Affairs Federal Institute (IFAM), Municipal Affairs Secretariat, Ministry of Interior, Argentina.

(in Spanish) This article about a place in Catamarca Province, Argentina is a stub.