San Diego is a city on the Pacific coast of California known for its beaches, parks, and warm climate. It’s situated in the southwestern corner of California, bordering Mexico. San Diego is among the most influential cities in the United States and a major hub for military and defense-related activities. It is the city's leading economic sectors. Since its founding in the 18th century, San Diego is renowned for influencing other cities around the world. It is famous for its captivating Spanish colonial buildings and modern structures that stand side by side to complement each other. Some of the places that make it famous include the stunning Balboa Park, Old Town San Diego State Historic Park, and the USS Midway Museum.

Census in the United States is done every 10 years and 2020 was the last time that it was conducted. According to the 2020 census, San Diego had a population of 1,386,932. Compared to other cities in the United States, San Diego is considered to be diverse. According to the 2020 census, 64.7% of the population is white in San Diego. This is due to many people moving to the city for its favorable climate and job opportunities. When it comes to religious beliefs, San Diego is also diverse as most people identify themselves as Christian, Jewish, Muslim, Hindu, and Buddhist. According to the data collected during the 2020 census, 36.7% people in San Diego identified themselves as Christian, 5.1% as Jewish, 2.7% Muslim, 1.2% Hindu, 0.7% Buddhist and 3.6% Other religions. On the other hand, 50% of respondents declared that they followed no religion. San Diego houses over 1.4 million residents, who collectively speak over 100 languages, including Spanish, Tagalog, Vietnamese, and, of course, English.

There are two tiers under local government in San Diego. They are citywide and local tier. Citywide administration is coordinated by the San Diego City Council, while local administration is carried out by smaller authorities. The San Diego City Council consists of the Mayor of San Diego, who has executive powers, and the San Diego City Council members, who scrutinize the Mayor's decisions and can accept or reject his budget proposals each year. The City Council is responsible for strategic planning, policing, the fire service, most aspects of transport and economic development. On the other hand, the local authorities are responsible for local services not overseen by the City Council, such as local planning, schools, social services, local roads and refuse collection.

San Diego is a major hub for military and defense-related activities, biotechnology research, and tourism. It has a GDP of over $231 billion, which is about 1.3 percent of the US's total GDP. The size of its economy is larger than that of several US states. The Port of San Diego handles 3.3 million metric tons of cargo every year.

San Diego has a comprehensive infrastructure plan for 2050, known as the San Diego Forward: The Regional Plan. It identifies a range of infrastructure priorities for San Diego, from new energy, water and sewerage infrastructure, to enhanced digital connectivity and new transit, rail and road schemes. Some of the investment is provided by the private sector, through the privatized utilities. This has generally worked well in San Diego, although business is particularly concerned at the lack of capacity in digital infrastructure. The take-up of high speed broadband by business is comparable to other world cities, but there are still areas that lack access to superfast broadband. Business sees these as priority areas for action by the Mayor.