There were 451,126 households out of which 30.2% had children under the age of 18 living with them, 44.6% were married couples living together, 11.4% had a female householder with no husband present, and 39.8% were non-families. 28.0% of all households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.30.
In the city the population was spread out with 24.0% under the age of 18, 12.4% from 18 to 24, 34.0% from 25 to 44, 19.1% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 101.7 males. For every 100 females age 18 and over, there were 100.4 males.
Military bases in San Diego include U.S. Navy ports, Marine Corps bases, and Coast Guard stations. One of the Marine Corps' two Recruit Depots is located in San Diego. San Diego is also known as the "birthplace of naval aviation," although Pensacola, Florida makes a rival claim.
San Diego is the site of one of the largest naval fleets in the world, and San Diego has become the largest concentration of Naval facilities in the world due to base reductions at Norfolk, Virginia and retrenchment of the Russian naval base in Vladivostok. Two of the U.S. Navy's Nimitz class supercarriers, (the USS Nimitz and the USS Ronald Reagan), five amphibious assault ships, several Los Angeles-class "fast attack" submarines, the Hospital Ship USNS Mercy, carrier and submarine tenders, and many smaller ships are home-ported there. Four Navy vessels have been named USS San Diego in honor of the city.
According to education rankings released by the U.S. Census Bureau, 40.4 percent of San Diegans ages 25 and older hold bachelor's degrees. The census ranks the city as the ninth most educated city in the United States based on these figures.
Public colleges and universities in the city include University of California, San Diego (UCSD), San Diego State University (SDSU, and the San Diego Community College District, which includes San Diego City College, San Diego Mesa College, and San Diego Miramar College.
Private colleges and universities in the city include Alliant International University (AIU), Design Institute of San Diego (DISD), John Paul the Great Catholic University, National University, NewSchool of Architecture and Design, Pacific Oaks College, The Art Institute of California, San Diego, Point Loma Nazarene University (PLNU), San Diego Christian College, Southern States University (SSU), Woodbury University School of Architecture's satellite campus, and University of San Diego (USD).
There is one medical school in the city, the UCSD School of Medicine. There are three ABA accredited law schools in the city, which include California Western School of Law, Thomas Jefferson School of Law, and University of San Diego School of Law. There is also one unaccredited law school, Western Sierra Law School.
Many popular museums, such as the San Diego Museum of Art, the San Diego Natural History Museum, the San Diego Museum of Man, and the Museum of Photographic Arts are located in Balboa Park. The Museum of Contemporary Art San Diego (MCASD) is located in an ocean front building in La Jolla and has a branch located at the Santa Fe Depot downtown. The Columbia district downtown is home to historic ship exhibits as well as the San Diego Aircraft Carrier Museum featuring the USS Midway aircraft carrier.
San Diego has a growing art scene. "Kettner Nights" at the Art and Design District in Little Italy has art and design exhibitions throughout many retail design stores and galleries on selected Friday nights. "Ray at Night" at North Park host a variety of small scale art galleries on the second Saturday evening of each month. La Jolla and nearby Solana Beach also have a variety of art galleries.
The San Diego Symphony at Symphony Towers performs on a regular basis and is directed by Jahja Ling. The San Diego Opera at Civic Center Plaza was ranked by Opera America as one of the top 10 opera companies in the United States. Old Globe Theatre at Balboa Park produces about 15 plays and musicals annually. The La Jolla Playhouse at UCSD is directed by Christopher Ashley. The Joan B. Kroc Theatre at Kroc Center's Performing Arts Centeris is a 600-seat state-of-the-art theatre that hosts music, dance and theatre performances. The San Diego Repertory Theatre at the Lyceum Theatres in Horton Plaza produces a variety of plays and musicals. Serving the northeastern part of San Diego is the California Center for the Arts in Escondido, a 400-seat performing arts theater.
Tourism has affected the city's culture, as San Diego houses many tourist attractions, such as SeaWorld San Diego, Belmont amusement park, San Diego Zoo, San Diego Wild Animal Park, and nearby Legoland. San Diego's Spanish influence can be seen in the many historic sites across the city, such as the Spanish missions and Balboa Park. Cuisine in San Diego is diverse, and there is an abundance of wood fired California-style pizzas, and Mexican and East Asian cuisine. Annual events in San Diego include Comic-Con, San Diego/Del Mar Fair, and Street Scene Music Festival.