Santa Clarita () is a city in northwestern Los Angeles County, California. With a 2020 census population of 228,673, it is the third-largest city by population in Los Angeles County, and the 17th-largest in the state of California. It is located about 30 miles (48 km) northwest of downtown Los Angeles, and occupies 70.75 square miles (183.2 km2) of land in the Santa Clarita Valley, along the Santa Clara River. It is a notable example of a U.S. edge city, satellite city, or boomburb.Human settlement of the Santa Clarita Valley dates back to the arrival of the Chumash people, who were displaced by the Tataviam circa 450 AD. After Spanish colonists arrived in Alta California, the Rancho San Francisco was established, covering much of the Santa Clarita Valley. Henry Mayo Newhall purchased the Rancho San Francisco in 1875 and established the towns of Saugus and Newhall. The Newhall Land and Farming Company played a major role in the city's development. In December 1987, the city of Santa Clarita was incorporated, encompassing the communities of Canyon Country, Newhall, Saugus, and Valencia. The four communities retain separate identities, and residents commonly refer to one of them when asked where they are from. Santa Clarita is bounded on the west by the Golden State Freeway (I-5). The Antelope Valley Freeway (CA-14) runs northeast–southwest forming part of the city's irregular east boundary. The two freeways meet at Newhall Pass, near the city's southernmost point. Santa Clarita is home to three institutions of higher education: California Institute of the Arts, an internationally renowned art university; The Master's University, a Christian liberal arts university; and College of the Canyons, a community college. Companies headquartered in or near the city include Princess Cruises, Sunkist, Remo, and the Newhall Land and Farming Company. Santa Clarita has a low crime rate and high-ranking schools, and is one of the state's fastest-growing cities. Six Flags Magic Mountain amusement park and Stevenson Ranch are both commonly associated with Santa Clarita. However, they are both located west of Interstate 5 and are thus outside the Santa Clarita city limits.

Pasadena () is a city in Los Angeles County, California, 11 miles (18 km) northeast of downtown Los Angeles. It is the most populous city and the primary cultural center of the San Gabriel Valley. With its substantial downtown area, observers consider it as either a suburb of nearby Los Angeles, or as a significant urban center in its own right.Its population was 137,122 at the 2010 census and an estimated 141,029 in 2019, making it the 41st largest city in California and the ninth-largest city in Los Angeles County. Pasadena was incorporated on June 19, 1886, becoming one of the first cities to be incorporated in what is now Los Angeles County, following the city of Los Angeles (April 4, 1850).Pasadena is known for hosting the annual Rose Bowl football game and Tournament of Roses Parade. It is also home to many scientific, educational, and cultural institutions, including Caltech, Pasadena City College, Fuller Theological Seminary, ArtCenter College of Design, the Pasadena Playhouse, the Ambassador Auditorium, the Norton Simon Museum, and the USC Pacific Asia Museum, with the Jet Propulsion Laboratory in nearby La Cañada Flintridge.

West Hollywood is a city in Los Angeles County, California, United States. Incorporated in 1984, it is home to the Sunset Strip. As of the 2010 U.S. Census, its population was 34,399. It is considered one of the most prominent gay villages in the United States.

Los Angeles (US: (listen) lawss AN-jəl-əs; Tongva: Tovaangar; Spanish: Los Ángeles; "The Angels"), often spoken and written as its initialism, L.A., is the largest city in California. With a 2020 population of 3,898,747, it is the second-largest city in the United States, after New York City, and the third-largest city in North America, after Mexico City and New York City. Los Angeles is known for its Mediterranean climate, ethnic and cultural diversity, Hollywood entertainment industry, and its sprawling metropolitan area. Los Angeles lies in a basin in southern California, adjacent to the Pacific Ocean, with mountains as high as 10,000 feet (3,000 m), and deserts. The city, which covers about 469 square miles (1,210 km2), is the seat of Los Angeles County, the most populous county in the United States. The Los Angeles metropolitan area (MSA) is home to a population of 13.1 million, making it the second-largest metropolitan area in the nation after that of New York. Greater Los Angeles includes metro Los Angeles as well as the Inland Empire and Ventura County. It is the second most populous U.S. combined statistical area, also after New York, with a 2015 estimate of 18.7 million people.Home to the Chumash and Tongva, the area that became Los Angeles was claimed by Juan Rodríguez Cabrillo for Spain in 1542. The city was founded on September 4, 1781, under Spanish governor Felipe de Neve, on the village of Yaanga. It became a part of Mexico in 1821 following the Mexican War of Independence. In 1848, at the end of the MexicanAmerican War, Los Angeles and the rest of California were purchased as part of the Treaty of Guadalupe Hidalgo, and thus became part of the United States. Los Angeles was incorporated as a municipality on April 4, 1850, five months before California achieved statehood. The discovery of oil in the 1890s brought rapid growth to the city. The city was further expanded with the completion of the Los Angeles Aqueduct in 1913, which delivers water from eastern California. Los Angeles has a diverse and robust economy, and hosts businesses in a broad range of professional and cultural fields. It also has the busiest container port in the Americas. In 2018, the Los Angeles metropolitan area had a gross metropolitan product of over $1.0 trillion, making it the city with the third-largest GDP in the world, after Tokyo and New York City. Los Angeles hosted the 1932 and 1984 Summer Olympics and will host the 2028 Summer Olympics.