It's not a series but my kidlets loved Marvin's Mansion by Ken Wilkins so much that they have spoken to him and asked when he is going to write the next book continuing the story of Marvin.

Rough plot:  Marvin finds his farm home is too crowded and when a group of mice decide to hitch a ride on a wagon to find homes in the city, he joins them. A near accident sends Marvin and several other mice into the ditch. They must work together to survive and find a place to call home.

I would love to see this become a series myself. Also I don't know why Amazon has this in the religion & spirituality section, I don't recall anything spiritual in it at all.