With a population 103,263,388 in 2005, Mexico is the most populous Spanish-speaking country in the world, the second-most populous country in Latin America after Portuguese-speaking Brazil, and the second in North America, after the United States. Throughout most of the twentieth century Mexico's population was characterized by rapid growth. Even though this tendency has been reverted and average annual population growth over the last five years was less than 1%, the demographic transition is still in progress, and Mexico still has a large cohort of youths.

The most populous city in the country is the capital city, Mexico City, with a population of 8.7 million (2005), and its metropolitan area is also the most populous in the country with 19.2 million (2005). Approximately 50% of the population lives in one of the 55 large metropolitan areas in the country. The Census Bureau in Mexico is the Instituto Nacional de Estadística y Geografía (INEGI).

The National Population Council (CONAPO), is an institution under the Secretary of the Interior in charge of the analysis and research of population dynamics. The National Commission for the Development of Indigenous Peoples (CDI), amongst other things, undertakes research and analysis of the sociodemographic and linguistic indicators of the indigenous peoples in Mexico. In 1900, the Mexican population was 13.6 million.

During the period of economic prosperity that was dubbed by economists as the "Mexican Miracle", the Mexican government invested in efficient social programs that reduced infant mortality rate and increased life expectancy which jointly led to an intense demographic increase between 1930 and 1980. The population's annual growth rate has been reduced from a 3.5% peak, in 1965 to 0.99% in 2005. While Mexico is now transitioning to the third phase of demographic transition, close to 50% of the population in 2009 was 25 and younger.

Fertility rates have also decreased from 5.7 children per woman in 1976 to 2.2 in 2006. The average annual population growth rate of the capital, the Federal District, was the first in the country at a mere 0.2%. The state with the lowest population growth rate over the same period was Michoacán (-0.1%), whereas the states with the highest population growth rates were Quintana Roo (4.7%) and Baja California Sur (3.4%), both of which are two of the least populous states and the last to be admitted to the Union in the 1970s.

The average annual net migration rate of the Federal District over the same period was negative and the lowest of all political divisions of Mexico, whereas the states with the highest net migration rate were Quintana Roo (2.7), Baja California (1.8) and Baja California Sur (1.6). While the national annual growth rate is still positive (1.0%), the national net migration rate is negative (-4.75/1000 inhabitants), given the intense flow of immigrants to the United States; an estimated 5.3 million undocumented Mexicans lived in the United States in 2004 and 18.2 million American citizens in the 2000 Census declared having Mexican ancestry. Mexico itself constitutes the second country of total number of immigrants to the United States from 1830 to 2000, after Germany.

The Mexican government projects that the Mexican population will grow to about 123 million by 2042 and then start declining slowly. Assumptions include fertility stabilizing at 1.85 children per woman and continued high net emigration (gently decreasing from 583,000 in 2005 to 393,000 in 2050).

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