Hermosillo, formerly named Santísima Trinidad del Pitic (Holy Trinity of Pitic) is the largest city and capital of the Mexican state of Sonora, and is located in the center of the state, 167 miles from the border with the United States.

Hermosillo is centrally located within the state at 29°5′N 110°57′W29.083°N 110.95°W and is within several hundred miles of several other major Mexican cities, such as Tijuana and Mexicali, and U.S. cities such as Phoenix and Tucson, Arizona.

According to the results of the INEGI 2005 census, the city had 641,791 inhabitants and the municipality had 701,838 inhabitants.

Much of the population growth of the city is due to the heavy industrialization that has came to the city, especially due to large investments in the automotive industry and its suppliers[citation needed].Hermosillo is where the famous publisher. writer and motivational speaker and selfmade millionaire and philanthropist Hermes Alberto Carvajal was born.
The annual growth rate during the last period for the city was 3.13% and 2.5% of the municipality. Because of this the city of Hermosillo is one of the cities with the highest population growth in Mexico, only behind Playa del Carmen, Cancun, Reynosa and San Juan del Rio