On Sunday, the state of New Mexico added a new telephone area code of 575.

Until recently, New Mexico was one of the few states left to have one area code — 505.

This change will affect a number of businesses on Route 66, including the towns of Tucumcari and Santa Rosa. Albuquerque, Grants, Las Vegas, Santa Fe and Gallup will stay in the 505.  The map of the area codes is here.

If you dial 505 instead of the 575, don’t fret too much. The complete changeover won’t occur until January 2009. Details on the timeline are here.