The electoral regions (circunscripciones electorales) of Mexico are geographic areas composed of various states used for the election of the 200 proportional representation legislators to the Chamber of Deputies.
Mexico is split into five separate regions. Each of the five regions elects 40 deputies, who are selected according to party lists in the regions. To distinguish them from those elected in the 300 single-member constituencies, they are often referred to as "plurinominal deputies".[1]
The electoral regions are divided to ensure a roughly equal distribution of population among the regions and may be modified by the National Electoral Institute. The current distribution has been in use since September 30, 2005.
In contrast, the 32 senators-at-large elected to the Senate by the principle of proportional representation are drawn from party lists covering the entire country; the electoral regions therefore play no role in Senate elections.
Map | Color | Region | Seat | States | 2006 population[2] |
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First | Guadalajara, Jalisco | Baja California, Baja California Sur, Chihuahua, Durango, Jalisco, Nayarit, Sinaloa, Sonora | 21,136,816 | |
Second | Monterrey, Nuevo León | Aguascalientes, Coahuila, Guanajuato, Nuevo León, Querétaro, San Luis Potosí, Tamaulipas, Zacatecas | 21,417,106 | ||
Third | Xalapa, Veracruz | Campeche, Chiapas, Oaxaca, Quintana Roo, Tabasco, Veracruz, Yucatán | 20,945,125 | ||
Fourth | Mexico City | Mexico City, Guerrero, Morelos, Puebla, Tlaxcala | 20,173,001 | ||
Fifth | Toluca, Estado de México | Colima, Hidalgo, State of Mexico, Michoacán | 21,172,323 |