The crossword solution for the term 'California Neighbor, Familiarly' is BAJA. Baja California is a Mexican state located on the Baja Peninsula, which is separated from mainland Mexico by the Gulf of California. It is the westernmost and northernmost state of Mexico, and is bordered by the U.S. state of California to the north. The nickname 'Familiarly' is often used to refer to Baja California due to its close proximity to California.