The first known inhabitants were the Indigenous
Kumeyaay, referred to as the Diegueño by the Spanish. In 1769 the Spanish started colonizing this area with the construction of the Spanish Missions. The First Settlement was by the MacKinnon family in 1875. In 1909 this farming community began to be developed when Boston developer J. Frank Cullen purchased land from the MacKinnons. For $30 a lot, one could buy land and build new homes. Frank Cullen's wife, Esther, a native of
Cardiff,
Wales, persuaded him to name the community "Cardiff-by-the Sea", as well as naming many streets after other cities in Britain, such as the English "Birmingham", "Oxford", "Chesterfield" and "Manchester", despite heavy Spanish influence in the area. In 1986, "Cardiff" joined with the nearby communities of Leucadia, Olivenhain, and Encinitas to form the incorporated city of Encinitas. The Cardiff Composer District includes twelve streets named for musicians. It was developed by music publisher turned film producer turned real estate developer
Victor Kremer. Cardiff became a destination for people seeking a tight-knit community to raise children, start a business and live in close proximity to the ocean. With a steady stream of newcomers, the years between the 1920s and 1950s saw a boom of housing and infrastructure development. In 1985, the local family-owned Seaside Market opened its doors and has been a mainstay in the community ever since. ==Government==