The 31st congressional district of California is located in the Inland Empire region, primarily covering parts of San Bernardino County. It includes cities such as Redlands, Loma Linda, and Yucaipa. The district is known for its diverse population and a mix of urban and suburban areas. This congressional district is represented in the U.S. House of Representatives and plays a role in shaping federal legislation. The district's boundaries can change every ten years due to the census, which can affect its demographic and political landscape.