In 2020, the total population of Mexico City reached 9.2 million and a population density of 6,163.3 residents by square kilometer. Population density has grown considerably in the country's capital during the past few decades, as it stood at 5,494 inhabitants per square meter in 1990.

Mexico City ranked as the most densely populated city in Mexico as of 2023. The capital recorded 8,657 inhabitants per square kilometer. Xalapa and Acapulco followed with 7,150 and 5,750 inhabitants per square kilometer, respectively.

The Global Human Footprint dataset of the Last of the Wild Project, version 2, 2005 (LWPv2) is the Human Influence Index (HII) normalized by biome and realm. The HII is a global dataset of 1 km grid cells, created from nine global data layers covering human population pressure (population density), human land use and infraestructure (built-up areas, nighttime lights, land use/land cover) and human access (coastlines, roads, navigable rivers).The Human Footprint Index (HF) map, expresses as a percentage the relative human influence in each terrestrial biome. HF values from 0 to 100. A value of zero represents the least influence -the "most wild" part of the biome with value of 100 representing the most influence (least wild) part of the biome.

During the last census, Iztapalapa registered a total of 1.8 million inhabitants, a population higher than the eight States with the lowest population in Mexico. Gustavo A. Madero and Álvaro Obregón ranked second and third, respectively. In contrast, Milpa Alta registered only 152,685 inhabitants.

From the year 2015 to 2020, there has been an increase in the population density in the Mexican city of Monterrey starting with 3,414.5 inhabitants per square kilometer and ending with 2020 with 3523.3 inhabitants, an 108.8 increase.

In 2024, approximately 22.81 million people lived in the São Paulo metropolitan area, making it the biggest in Latin America and the Caribbean and the fifth most populated in the world. The homonymous state of São Paulo was also the most populous federal entity in the country. The second place for the region was Mexico City with 22.51 million inhabitants.

Brazil's cities

Brazil is home to two large metropolises, only counting the population within the city limits, São Paulo had approximately 12.4 million inhabitants, and Rio de Janeiro around 6.8 million inhabitants. It also contains a number of smaller, but well known cities such as Brasília, Salvador, Belo Horizonte and many others, which report between 2 and 3 million inhabitants each. As a result, the country's population is primarily urban, with nearly 85 percent of inhabitants living in cities.

Mexico City

Mexico City's metropolitan area ranks fifth in the ranking of most populated cities in the world. Founded over the Aztec city of Tenochtitlan in 1521 after the Spanish conquest as the capital of the Viceroyalty of New Spain, the city still stands as one of the most important in Latin America. Nevertheless, the preeminent economic, political, and cultural position of Mexico City has not prevented the metropolis from suffering the problems affecting the rest of the country, namely, inequality and violence. Only in 2021, the city registered a crime incidence of 45,336 reported cases for every 100,000 inhabitants and around 32 percent of the population lived under the poverty line.

In 1800, the present-day region of Mexico had a population of just over six million people. Mexico gained its independence from the Spanish crown in 1821, and population growth remained steady for the next 85 years. Growth then halted with with the Panic of 1907, an American financial crisis whose ripple effects in Mexico would set the stage for the Mexican Revolution in 1910. This revolution would see population flatline at just over fifteen million between 1910 and 1920, as widespread conflict and result in the death of between 1.7 to 2.7 million over the decade, and the coinciding 1918 Spanish Flu epidemic would see the loss of another 300,000 in this time period. Following the end of both the Mexican Revolution and the Spanish Flu epidemic in 1920, the population of Mexico would begin to increase rapidly as modernization would see mortality rates fall and standards of living rise throughout the country. This growth has continued steadily into the 21st century, and in 2020, Mexico is estimated to have a population of just under 129 million.

From the year 2015 to 2020 there has been an increase in the population density in Guadalajara, Mexico. During the last year, the city had around 9,658 inhabitants per square meter, while five years prior the density was lower than 9,180 inhabitants.

From the year 1994 to 2023, there has been an overall decrease in the number of newborns in the Mexican city of Monterrey. The highest amount was recorded in 2000 with 27,870 births. While the lowest amount recorded was in 2020 with 13,050.

From the year 1995 to 2020, there has been an overall increase in the number of people that speaks an indigenous language in the Mexican city of Monterrey. The highest amount of indigenous language speakers was in the year 2010 with 11,380 speakers. In the contrast the lowest number registered was in the year 1995 with 3,360 people.

The statistic depicts the unemployment rate in Mexico from 1999 to 2023. In 2023, Mexico's unemployment rate was around 2.77 percent. Mexico's population Mexico is the third largest country in North America. Mexico’s economy has developed and improved over the years, partially due to a better relationship with the United States. Mexico’s total population was estimated to amount to around 120 million people in 2014, with the majority, i.e. more than 60 percent, having a Mestizo background. Despite a remarkably high migration flow between Mexico and the United States, with more than 11.5 million Mexican migrants living in the United States, Mexico’s population is still growing at a constant rate. In addition, life expectancy in Mexico is increasing, pointing towards an improvement of living conditions. However, the high total population numbers affect the population density. In 2012, there were more than 62 inhabitants per square kilometer registered, ten more than a decade ago. This trend is most likely to increase but not worriyngly so, since Mexico is still far from being one of the countries with the highest population density . Among the Mexican metropolises, Mexico City has the highest number of residents by far.

Through the time period displayed in the Mexican state of Guadalajara there has been a decrease in the population since the year 2000 which registered about 1.63 million people until the last population count conducted in 2020 resulted in 1.38 million people, almost 300 thousand people less.

As of 2023, Tokyo-Yokohama in Japan was the largest world urban agglomeration, with 37,8 million people living there. Jakarta ranked second with 34 million, with Delhi in third with 32 million inhabitants.

In the Mexican city of Guadalajara, the strongest main reason for migration was for family purposes with 8.7 thousand people sharing this background. Following with economic reasons with 3.3 thousand people and housing purposes with 2.9 thousand people.

From the year 1994 to 2023, there has been an overall decrease in the number of births in the Mexican city of Guadalajara. The highest amount was recorded in 1994 with around 53.3 thousand newborns. In contrast, the lowest amount recorded was on 2020 with 16.9 thousand births.