What Guatemalan Departments are preceeded by "El"?

The use of the definite article "El" in Guatemalan department names varies so much in popular culture that it is hard to know what's correct. "El Progreso", "El Quiché" and "El Petén" all make regular appearances in the press, publications and the Internet. Ask three different people and you may get three different answers. Respected newspapers (both national and international), magazines and, of course, endless Web entries can't seem to agree on what's proper, sometimes even within their own institutions.

So what's the correct answer? According to the Guatemalan Government, more specifically the National Statistics Institute (INE), the only department that officially uses the definite article "El" is El Progreso (shown in blue below).

the department of El Progreso in Guatemala