Ahuachapán is a city, district, and the capital of the Ahuachapán Department in western El Salvador. The district, including the city, co…Ahuachapán is a city, district, and the capital of the Ahuachapán Department in western El Salvador. The district, including the city, covers an area of 244.84 km² and as of 2007 has a population of 110,511 people. Situated near the Guatemalan border, it is the westernmost city in the country and is the center of an agricultural region producing primarily coffee.