Area codes 909 and 840

Starting in the 1950s, Southern California experienced rapid expansion of telephone service, requiring area code 213 to be split five times by 1998.The first split became necessary in 1951, when most of the southern and eastern portion, including San Diego and most of Orange County, was assigned area code 714.On August 26, 1999, the NANPA approved a request by the California Public Utilities Commission for a two-phase split/overlay plan to provide area code relief for 909.(Similar plans were being considered to provide relief to the 310, 415, 510, 760 and 818 area codes as well; however, due to number rationing, all were postponed indefinitely and later permanently cancelled.)909 continued to serve small portions of Corona, Riverside, Moreno Valley, and the entire city of Calimesa, all of which are in Riverside County, as well as small portions of eastern Los Angeles and northern Orange Counties; area code 752 was returned to the numbering pool to be reassigned at a later date.
458/541 775 702 928 442/760 916/279 530 707 209 559 831 805 661 858 909 951 619 213 323 707 916/279 415 650 510/341 925 408 209 831 805 661 442/760 310/424 747/818 626 909 951 949 562 657/714
Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes.Area codes 840 and 909 are shown in red.
area codesNorth American Numbering PlanLos Angeles CountySan Bernardino CountyRiverside CountyU.S. stateCaliforniaarea code splitoverlay complexArea code 951EastvaleCoronaAmerican Telephone and Telegraph Companytelephone numbering planoriginal North American area codesMexican borderCentral CoastSan DiegoOrange Countyarea code 714number poolingClaremontDiamond BarGlendora626 area codeCity of Industry562 area codeLa VernePomonaRowland HeightsSan DimasWalnutWest CovinaCalimesaBig Bear CityBig Bear LakeBloomingtonBlue JayChino Hills657/714 area codeColtonCrestlineFontanaGrand TerraceHighlandLake ArrowheadLoma LindaLytle CreekMentoneMontclairMuscoyOntarioRancho CucamongaRedlandsRialtoRunning SpringsSan Antonio HeightsSan BernardinoSugarloafUplandYucaipaList of California area codesList of North American Numbering Plan area codes209/350213/323310/424408/669415/628510/341619/858707/369714/657760/442805/820818/747916/279