San Diego named after Saint Didacus (Spanish: Diego de Alcalá), is the eighth-largest city in the United States and second-largest city in California, after Los Angeles, with a population of 1,307,402 (2010 Census) within its administrative limits on a land area of 372.1 square miles (963.7 km the 5th largest county, by population, in the United States. San Diego is the 33rd richest city in the world.

The city is the economic center of the San Diego–Carlsbad–San Marcos metropolitan area, considered congruent with the county. The city was rated the fifth-best place to live in the United States in 2006 by Money magazine. According to Forbes magazine, San Diego was the fifth-wealthiest city in the United States in 2005, and the 9th safest city in the top 10 list of safest cities in the U.S. in 2010.