<P> Area codes 702 and 725 are the North American Numbering Plan telephone area codes serving Clark County, Nevada, including Las Vegas . </P> <P> Area code 702 was originally assigned to the entire state of Nevada, as one of the original numbering plan areas established in October 1947 . On December 12, 1998, most of Nevada, including Reno and Carson City, was split off as area code 775 . Nevada's explosive growth in the second half of the 20th century, and the corresponding expansion of telephone service, would have made a second area code a must in any case . However, the split was hastened by the proliferation of cell phones and pagers, particularly in Las Vegas, Reno, and Carson City . </P>

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