DescriptionAt statehood in 1912, Arizona's population was only 200,000 people- roughly the population of Peoria or Scottsdale today(as of 2021). According the the US Census, Arizona's population in 2021 was nearly 7.3 million people. Arizona's population growth has accelerated several times over the last century, with large peaks in the 1990s and in the 1950s following World War II.More InformationUnited States Census