Electoral regions of Mexico

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 sends 40 deputies, which are selected according to party lists in the regions.

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.


Color	Region	Seat	States	2006 population
	First	Guadalajara, Jalisco	Baja California, Baja California Sur, Chihuahua, Durango, Jalisco, Nayarit, Sinaloa, and Sonora	21,136,816
	Second	Monterrey, Nuevo León	Aguascalientes, Coahuila, Guanajuato, Nuevo León, Querétaro, San Luis Potosí, Tamaulipas, and Zacatecas	21,417,106
	Third	Xalapa, Veracruz	Campeche, Chiapas, Oaxaca, Quintana Roo, Tabasco, Veracruz, and Yucatán	20,945,125
	Fourth	Mexico City	Mexico City, Guerrero, Morelos, Puebla, and Tlaxcala	20,173,001
	Fifth	Toluca, Estado de México	Colima, Hidalgo, State of Mexico and Michoacán	21,172,323

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