The crossword solution for the term PART OF S.D. is SAN, which stands for SAN Diego. SAN Diego is a major city in California located on the coast of the Pacific Ocean. It is the second-largest city in the state and the eighth-largest in the United States. SAN Diego is known for its mild climate, natural deep-water harbor, and extensive beaches. It is also home to a number of cultural attractions, including the SAN Diego Zoo, SeaWorld, and Balboa Park.