505 area code in NW New Mexico, after 2007.
505 area code in NW New Mexico, after 2007.
The original 505 area code, covering the whole state.
The original 505 area code, covering the whole state.

North American area code 505 is a New Mexico telephone area code which was one of the original area codes established in October 1947. Until October 7, 2007, it covered the entire state of New Mexico. It serves the northwestern and central portions of the state, including the Albuquerque metropolitan area, Gallup, Santa Fe, and Farmington.

Due to the increasing demand for new numbers, area code 505 was split on October 7, 2007. Northwestern and central New Mexico continued to be served by the 505 area code, while the remainder of the state switched to area code 575.[1] The issue was decided in 2006 by vote of the New Mexico Public Regulation Commission, with a 3–2 majority in favor of allowing the Albuquerque area to keep the old area code.[2]

The question of how to implement a new area code was a contentious one.[citation needed] The need for a new code had been clear since at least 2000[3], but the PRC's initial votes for Albuquerque and Santa Fe to switch to a new area code and the rest of the state to keep the old 505 area code (including the Farmington and Gallup areas that are now part of the current 505 area code) were met with vocal opposition.[4] Amid heightening tensions between the urban and rural areas of the state, the commission eventually chose to put off the decision until 2006 after number pooling made the immediate addition of a new code unnecessary.[5]

Prior to October 2021, area code 505 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.[1]

"The 505" (a reference to the area code for New Mexico) is a slang term indicating the state of New Mexico.[citation needed]


  1. ^ "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.
  1. ^ NANPA publication PL 358, (December 21, 2006) NPA 505 Split, Creating NPA 575 (New Mexico) (PDF)
  2. ^ Amadeo, Michael (November 9, 2006). "Metro area to keep 505 area code." The Albuquerque Tribune.
  3. ^ (March 16, 2000). "2nd area code on its way to busy N.M. phone lines." Albuquerque Journal.
  4. ^ Rayburn, Rosalie (June 2, 2001). "Regulators Get Death Threats for Area-Code Vote." Albuquerque Journal.
  5. ^ Rayburn, Rosalie (July 14, 2002). "Deadline For 505 Extended." Albuquerque Journal.
New Mexico area codes: 505, 575
North: 970
West: 928 area code 505 East: 575
South: 575
Arizona area codes: 480, 520, 602, 623, 928
Colorado area codes: 303/720, 719, 970

Coordinates: 45°30′N 123°00′W / 45.500°N 123.000°W / 45.500; -123.000