Nearly everyone lives in the southwestern corner, which includes part of the Inland Empire, Victor Valley and Morongo Basin communities.
Republicans enjoy a solid edge in registration.
The Inland Empire grew so much in the 1980s that it gained two new congressional districts in 1992. Such growth continued in the 1990s, especially in Victor Valley, where affordable land and housing have made the area a magnet for Los Angeles workers. The 40th's economy was hit hard by base closures - it lost close to half of its military population when George and Norton Air Force bases closed in 1992 and '94. Locals hope a new trade center and industrial park will replace many lost military jobs.