Mexico – Voter ID Number (Clave de Elector)

The voter ID number (Clave de Elector) is an 18-character alphanumeric code located on the Mexican voter registration card. It is structured as follows:

  • Six letters from the individual’s legal name:
    • First letter and first internal consonant of the paternal surname
    • First letter and first internal consonant of the maternal surname
    • First letter and first internal consonant of the given name
  • The individual’s six-digit birth date in YYMMDD format
  • The two-digit, state ID code (Clave de la Entidad Federativa) of the individual’s birthplace
  • One letter indicating the individual’s gender: “H” for male (hombre); “M” for female (mujer)
  • A one-digit verification number (dígito verificador)
  • A two-digit, numeric homonym key (clave de homonimia) to avoid duplicate voter ID numbers

Figuring Out a Voter ID Number from Personal Details

To better understand the voter ID number, consider an individual with the following details:

  • Name: Juan Carlos Hernandez Garcia
  • Date of birth: May 6, 1982
  • Place of birth: Ensenada, Baja California, Mexico
  • Verification digit: 9
  • Homonym key: 00

Given Hernandez’s personally identifiable information (PII), his voter ID number will be:


The names José and María are typically ignored when constructing ID numbers. Read more about this in the Sayari Learn article on Mexican naming conventions and ID numbers.

Consider an individual with the same PII as Juan Carlos Hernandez Garcia but with the name José Alonso Hernandez Garcia. In this instance, Jose is ignored when constructing the CURP and Alonso is used as the given name instead. The resulting voter ID number will be:


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