Most of these euthenize animals, so if you see a dog or cat you are interested in, call immediately. Most provide pictures and descriptions of adoptable animals.
Inland Valley Humane Society Pomona (no pictures or descriptions)
West End Animal Shelter (Ontario)
Rancho Cucamonga Animal Shelter
San Bernardino County Animal Control
Riverside County Animal Control
Los Angeles County Animal Control
Los Angeles City Animal Control
Petfinders (Searches rescues, private shelters, and animal control for adoptable animals. Search by species, breed, sex, location)