Claim: Anaheim, California is the most populous city.

Anaheim -LRB- pronounced -LSB- ˈænəhaɪm -RSB- -RRB- is a city in Orange County , California , part of the Los Angeles metropolitan area . As of the 2010 United States Census , the city had a population of 336,265 , making it the most populous city in Orange County and the 10th most populous city in California . Anaheim is the second largest city in Orange County in terms of land area -LRB- after Irvine -RRB- and is known for its theme parks , the Anaheim Convention Center , and its two major sports teams : the Anaheim Ducks ice hockey club and the 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 would later be split off from Los Angeles County in 1889 . Anaheim remained largely a rural community until Disneyland opened in the city 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 's city limits extend from Cypress in the west to the Riverside County line in the east and encompass a diverse collection of neighborhoods and communities . Anaheim Hills is a master-planned community located in the city 's eastern stretches that is home to many of the city 's affluent . Downtown Anaheim has three mixed-use historic districts , the largest of which is the Anaheim Colony . The Anaheim Resort , a commercial district , includes Disneyland , Disney California Adventure , and numerous hotels and retail complexes . The Platinum Triangle , a neo-urban redevelopment district surrounding Angel Stadium , is planned to be populated with mixed-use streets and high-rises . Anaheim Canyon is an industrial district north of California State Route 91 and east of California State Route 57 .