How many restaurant are there

I know of only 2, I think there used to be more. Each owned by a different brother, separately. The one in Gridley also has the store and "deli".

I think 2. Yuba City and Gridley.

2 - Gridley and YC

There are two Casa Lupe restaurants one in Gridley and one in Yuba City. Within a short walking distance there's a Carl's Junior and Wendy's. I think Chris Harris' comment is also correct about a Casa Lupe grocery store and deli in Gridley.