California's 31st congressional district is a congressional district in San Bernardino County, in the U.S. state of California.
Wikipedia contributors, "California's 31st congressional district," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=California's_31st_congressional_district&redirect=no&useskin=monobook&oldid=562320029 (accessed July 12, 2013).