About San Bernardino County, CA
San Bernardino County, California is the nation’s largest in terms of area, outranking 9 smaller states. This Southern California County is 90% desert, with the San Bernardino Mountains and Valley comprising the remainder. San Bernardino County encompasses the Mojave National Preserve, known for its sand dunes and volcanic formations, as well as part of the Joshua Tree National Park. The area is also the birthplace of famous fast-food chains McDonald’s and Taco Bell.