Morro Bay is a waterfront city in San Luis Obispo County, California. As of the 2010 census, the city population was 10,234, down from 10,350 at the 2000 census.HistoryThe prehistory of Morro Bay relates to Chumash settlement, particularly near the mouth of Morro Creek. At least as early as the Millingstone Horizon thousands of years before present, there was an extensive settlement along the banks and terraces above Morro Creek.The first European land exploration of Alta California, the Spanish Portola expedition, came down Los Osos Valley and camped near today's Morro Bay on September 8, 1769. Franciscan missionary and expedition member Juan Crespi noted in his diary that "we saw a great rock in the form of a round morro".Morro Rock later gave its name to the town. The descriptive term morro is common to the Spanish, Portuguese and Italian languages, and the word is part of many place names where there is a distinctive and prominent rock formation. Note that the similar Spanish descriptive word "moro" indicates a bluish color rather than a shape.The first recorded Filipinos to visit America arrived at Morro Bay on October 18, 1587, from the Spanish galleon Nuestra Señora de Esperanza; one of whom was killed by local Native Americans while scouting ahead.