As of the 2020 census, which of these American state capitals has a population of over one million?

Phoenix is a city located in Maricopa County Arizona. It is also the county seat of Maricopa County. With a 2020 population of 1,733,630, it is the largest city in Arizona and the 5th largest city in the United States. Phoenix is currently growing at a rate of 1.54% annually and its population has increased by 19.92% since the most recent census, which recorded a population of 1,445,630 in 2010.

Denver is a city located in Adams County, Denver County, and Jefferson County Colorado. It is also the county seat of Denver County. With a 2020 population of 749,103, it is the largest city in Colorado and the 19th largest city in the United States.

Boston is a city located in Middlesex County and Suffolk County Massachusetts. With a 2020 population of 695,506, it is the largest city in Massachusetts and the 21st largest city in the United States.

Nashville is a city located in Davidson County Tennessee. It is also the county seat of Davidson County. With a 2020 population of 678,448, it is the largest city in Tennessee and the 23rd largest city in the United States.