California - choose a jigsaw puzzle to solve

California is a state in the Pacific Region of the United States of America . With 39.5 million residents, California is the most populous state in the United States and the third most extensive by area . The state capital is Sacramento. The Greater Los Angeles Area and the San Francisco Bay Area are the nation's second - and fifth-most populous urban regions, with 18.7 million and 8.8 million residents respectively. Los Angeles is California's most populous city , and the country 's second -most populous, after New York City . California also has the nation's most populous county, Los Angeles County; its largest county by area , San Bernardino County; and its fifth most densely populated county, San Francisco . California's $2.75 trillion economy is larger than that of any other state. If it were a country , California would be the 5th largest economy in the world , and the 36th most populous as of 2017 . The Greater Los Angeles Area and the San Francisco Bay Area are the nation's second - and third-largest urban economies ($1.2 trillion and $821 billion respectively as of 2016 ), after the New York City metropolitan area . The San Francisco Bay Area 's combined statistical area had the nation's highest GDP per capita in 2016 (~$94,000), and is home to four of the world 's ten largest companies by market capitalization and four of the world 's ten richest people .