Mazatenango is a city with a population of 77,431 and a municipality in the Suchitepéquez department of Guatemala. It is the capital of Suchitep…Mazatenango is a city with a population of 77,431 and a municipality in the Suchitepéquez department of Guatemala. It is the capital of Suchitepéquez department, and is located 165 km from Guatemala City.