Costa Mesa is a city in Orange County, California. The population was 109,960 at the 2010 census. Since its incorporation in 1953, the city has grown from a semi-rural farming community of 16,840 to a primarily suburban and "edge" city with an economy based on retail, commerce, and light manufacturing.

Members of the Gabrieleño/Tongva and Juaneño/Luiseño nations long inhabited the area. After the 1769 expedition of Gaspar de Portolà, a Spanish expedition led by Father Junípero Serra named the area Vallejo de Santa Ana (Valley of Saint Anne). On November 1, 1776, Mission San Juan Capistrano became the area's first permanent European settlement in Alta California, New Spain.

In 1801, the Spanish Empire granted 62,500 acres (253 km²) to Jose Antonio Yorba, which he named Rancho San Antonio. Yorba's great rancho included the lands where the communities of Olive, Orange, Villa Park, Santa Ana, Tustin, Costa Mesa and Newport Beach stand today.

After the Mexican-American war, California became part of the United States and American settlers arrived in this area and formed the town of Fairview in the 1880s near the modern intersection of Harbor Boulevard and Adams Avenue. An 1889 flood wiped out the railroad serving the community, however, and it shriveled.