California is a U. S. state.
California . Los Angeles is California 's most populous city , and the country 's second largest after New York City . Los Angeles . With a census-estimated 2017 population of 4,042,000 , it is the second-most populous city in the United States ( after New York City ) and the most populous city in the state of California . San Bernardino County , officially the County of San Bernardino , is a county located in the southern portion of the U.S. state of California .