San Isidro, Apozol, Zacatecas

I recently found the primary family I'm researching in Jalisco had moved over to "San Isidro, Apozol, Zacatecas" by the 1930 census. When I Google this, I keep getting a place called "Los Llamas."

Does anyone know anything of this rancho - San Isidro, Apozol? Does anyone have any contacts in that area?

I'm hitting a wall with death records, marriages. Several of the family members eventually went back to Villa Guerrero/Totatiche to marry, but I have some holes for that period between 1930 and 1950. One of the daughters and Magdalena, the mother, died later in Guadalajara.

I'd really like to get more recent than 1930, too. Here is the family.

Gumesindo Serrano, 55
Madalena Rios, 35
Ricardo Serrano, 15
Feliz Serrano, 12
Fransisco Serrano,10
Olibia Serrano, 6
Elena Serrano, 4

Gumersindo is the son of Jose Felix Serrano and the family traces back to Tlaltenango de Sanchez Roman for generations.

Is any of this familiar to anyone?

Thanks!