Phoenix is the capital city of the state of Arizona and was originally settled in 1867. It is known by many as the Valley of the Sun, the Salt River Valley, and the Phoenix Metro. The metropolitan area surrounding Phoenix includes smaller cities like Scottsdale, Mesa, Tempe, and many other cities at the seat of Maricopa County. According to the U.S. Census Bureau in 2019, the city of Phoenix is the most populous city in Arizona, with a population of approximately 1,680,992 people. It is also the fifth most populous city in the United States. The metropolitan area is the 11th largest by population in the United States, with approximately 4.73 million people as of 2017. It is also one of the fastest-growing major metropolitan areas, gaining nearly 800,000 residents from 2010 to 2018, and nearly 1.6 million since 2000.