Moving To Los Angeles: 6 Part Series on Relocating to Los Angeles for Newbies - Part2 - The San Gabriel Valley San Gabriel Valley is one of the 6 regions of Los Angeles. It is the eastern most region of LA and borders the western side of Orange County. The cities of the San Gabriel Valley range from Long Beach on the south to Pasadena on the north, to Downey on the west and Cypress on the east. There actually is a city of San Gabriel within the valley, and a historic San Gabriel Mission. There is a total of 31 cities in San Gabriel Valley. The San Gabriel Mountains borders the north around the AltaDena and Sierra Madre areas. Due to the way those mountains are located, it sometimes creates poor air quality in that area, as some residents have noticed. If you are an aficionado of histori... 06/06/2010