Irrespective of population, no state may be represented by fewer than two electoral districts. This is the case with Baja California Sur (population: 512,000), Campeche (population: 755,000) and Colima (population: 568,000), which, as a result, return more senators than deputies to Congress. The states with the most electoral districts are the state of México (population: 14 million), with 40, and Veracruz (population: 7.1 m), with 21. The Federal District, with a population of 8.8 m, has 27.
Under this scheme, the current electoral districts are the following:
The numbers indicate the number of districts in each federal entity for the 2006 and 2009 elections. 
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