Anaheim () is a city in Orange County, California, part of the Los Angeles metropolitan area. As of the 2020 United States Census, the city had a population of 346,824, making it the most populous city in Orange County, the 10th-most populous city in California, and the 56th-most populous city in the United States. Anaheim is the second-largest city in Orange County in terms of land area, and is known for being the home of the Disneyland Resort, the Anaheim Convention Center, and two major sports teams: the Anaheim Ducks ice hockey club and the Los Angeles Angels baseball team. Anaheim was founded by fifty German families in 1857 and incorporated as the second city in Los Angeles County on March 18, 1876; Orange County was split off from Los Angeles County in 1889. Anaheim remained largely an agricultural community until Disneyland opened in 1955. This led to the construction of several hotels and motels around the area, and residential districts in Anaheim soon followed. The city also developed into an industrial center, producing electronics, aircraft parts and canned fruit. Anaheim is a charter city.Anaheim's city limits extend almost the full width of Orange County, from Cypress in the west, twenty miles east to the Riverside County line, encompassing a diverse range of neighborhoods. In the west, mid-20th-century tract houses predominate. Downtown Anaheim has three mixed-use historic districts, the largest of which is the Anaheim Colony. South of downtown, a center of commercial activity of regional importance begins, the Anaheim–Santa Ana edge city, which stretches east and south into the cities of Orange, Santa Ana and Garden Grove. This edge city includes the Disneyland Resort, with two theme parks, multiple hotels, and its retail district; Disney is part of the larger Anaheim Resort district with numerous other hotels and retail complexes. The Platinum Triangle, a neo-urban redevelopment district surrounding Angel Stadium, which is planned to be populated with mixed-use streets and high-rises. Further east, Anaheim Canyon is an industrial district north of the Riverside Freeway and east of the Orange Freeway. The city's eastern third consists of Anaheim Hills, a community built to a master plan, and open land east of the Route 241 tollway.

Irvine () is a master-planned city in Orange County, California, United States in the Los Angeles metropolitan area. The Irvine Company started developing the area in the 1960s and the city was formally incorporated on December 28, 1971. The 66-square-mile (170 km2) city had a population of 307,670 as of the 2020 census. A number of corporations, particularly in the technology and semiconductor sectors, have their national or international headquarters in Irvine. Irvine is also home to several higher education institutions including the University of California, Irvine (UCI), Concordia University, Irvine Valley College, the Orange County Center of the University of Southern California (USC), and campuses of California State University Fullerton (CSUF), University of La Verne, and Pepperdine University.

Costa Mesa () is a city in Orange County, California. Since its incorporation in 1953, the city has grown from a semi-rural farming community of 16,840 to a suburban area including part of the South Coast Plaza–John Wayne Airport edge city, one of the region's largest commercial clusters, with an economy based on retail, commerce, and light manufacturing. The population was 109,960 at the 2010 United States Census.

Huntington Beach is a seaside city in Orange County in Southern California, located 35 miles (56 km) southeast of Downtown Los Angeles. The city is named after American businessman Henry E. Huntington. The population was 189,992 during the 2010 census, making it the fourth most populous city in Orange County, the most populous beach city in Orange County, and the seventh most populous city in the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area. It is bordered by Bolsa Chica Basin State Marine Conservation Area on the west, the Pacific Ocean on the southwest, by Seal Beach on the northwest, by Westminster on the north, by Fountain Valley on the northeast, by Costa Mesa on the east, and by Newport Beach on the southeast. Huntington Beach is known for its long 9.5-mile (15.3 km) stretch of sandy beach, mild climate, excellent surfing, and beach culture. The ocean waves are enhanced by a natural effect caused by the edge-diffraction of open ocean swells around Santa Catalina Island. Swells generated predominantly from the North Pacific in winter and from a combination of Southern Hemisphere storms and hurricanes in the summer focus on Huntington Beach, creating consistent surf all year long, hence the nickname "Surf City".