The crossword solution for the term 'MESA, CALIF.' is 'COSTA', which is a five-letter word. Costa Mesa is a city in Orange County, California, located about 40 miles south of Los Angeles. It is bordered by Newport Beach on the west, Irvine on the north, and Huntington Beach on the south. Costa Mesa is known for its vibrant arts and culture scene, as well as its many shopping centers and restaurants.