San Diego is a city in the U.S. state of California on the coast of the Pacific Ocean and immediately adjacent to the Mexican border. San Diego is the eighth most populous city in the United States and second most populous in California. The city is the county seat of San Diego County. The city is known for its mild year-round climate, natural deep-water harbour, extensive beaches and parks, long association with the United States Navy and Marine Corps, and recent emergence as a healthcare and biotechnology development centre.
Historically home to the Kumeyaay people, San Diego is frequently referred to as the "Birthplace of California", as it was the first site visited and settled by Europeans on what is now the West Coast of the United States.
San Diego's main economic engines are military and defence related activities, tourism, international trade, research, and manufacturing. The city is the economic centre of the San Diego–Tijuana conurbation. The primary border crossing between San Diego and Tijuana, the San Ysidro Port of Entry, is the busiest international land border crossing in the world outside of Asia. The city's primary airport, San Diego International Airport, is the busiest single-runway airport in the world.
San Diego is rated Beta − by the Globalization and World Cities Research Network (GaWC) which evaluates and ranks the relationships between world cities in the context of globalisation. Beta level cities are cities that link moderate economic regions to the world economy.
San Diego is the #60 city in the world according to the Global Financial Centres Index (GFCI) which evaluates and ranks the competitiveness of the major financial centres of the world according to a wide range of criteria – Human Capital, Business, Finance, Infrastructure and Reputation.
San Diego is ranked #34 by the Global Urban Competitiveness Report (GUCR) which evaluates and ranks world cities in the context of economic competitiveness. San Diego is rated C by the Global Urban Competitiveness Report (GUCR) which evaluates and ranks world cities in the context of economic competitiveness. C cities are international gateway cities. San Diego has a population of over 1,423,851 people. San Diego also forms part of the wider San Diego-Carlsbad metropolitan area which has a population of over 3,231,000 people. San Diego is the #76 hipster city in the world, with a hipster score of 4.8626 according to the Hipster Index which evaluates and ranks the major cities of the world according to the number of vegan eateries, coffee shops, tattoo studios, vintage boutiques, and record stores per 100,000 city residents.