Sonsonate is a department of El Salvador in the western part of the country. The capital is Sonsonate. The department has an area of 1,226 km². Created on June 12, 1824. The El Salvador National Parliament decided on January 29, 1859 to separate from the department the cities of Apaneca, San Pedro Puxtla, Guaymango and Jujutla and give these …Sonsonate is a department of El Salvador in the western part of the country. The capital is Sonsonate. The department has an area of 1,226 km². Created on June 12, 1824. The El Salvador National Parliament decided on January 29, 1859 to separate from the department the cities of Apaneca, San Pedro Puxtla, Guaymango and Jujutla and give these cities to Santa Ana Department.