Īs of July 2022, Jacksonville's population was 971,319, while the population of Duval County was about 1 million. It is the seat of Duval County, with which the City of Jacksonville consolidated in 1968.Ĭity-county consolidation greatly increased Jacksonville's official population and extended its boundaries, placing most of Duval County's population within the new municipal limits Jacksonville grew to 900 square miles (2,300 km 2), making it the largest city by area in the contiguous United States. Jacksonville is a city located on the Atlantic coast of northeastern Florida, the most populous city proper in the state and the largest city by area in the contiguous United States as of 2020.