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Northeast Florida

Duval County is in the northeastern part of the U.S. state of Florida. As of July 2022, the population was 1,016,536, up from 864,263 in 2010. It is Florida's sixth-most populous county. Its county seat is Jacksonville, with which the Duval County government has been consolidated since 1968. Duval County was established in 1822, and is named for William Pope Duval, Governor of Florida Territory from 1822 to 1834. Duval County is the central county of the Jacksonville Metropolitan Statistical Area.

St. Johns County is a county in the northeastern part of the U.S. state of Florida. As of the 2020 United States census, its population was 273,425. The county seat and most populous incorporated city is St. Augustine, although the nearby community, St. Johns, has a higher population. St. Johns County is part of the Jacksonville metropolitan area.

The county was established in 1821. It is one of the two original counties established after Florida was ceded to the United States, at the start of the Florida Territorial period, and corresponded roughly to the former colonial province of East Florida. It was named for the St. Johns River, which runs along its western border.

Today, St. Johns County primarily comprises residential bedroom communities for those who commute to Jacksonville. Tourism, primarily associated with St. Augustine and the many golf courses in the area, is the chief economic industry.

Clay County is located in the northeastern part of the U.S. state of Florida along the west bank of the St. Johns River. As of 2020, the population was 218,245 and in 2022, that number increased to 226,589, making it the third largest county in the Jacksonville metropolitan area.[2] While most of the county is unincorporated, there are 4 municipalities with Green Cove Springs being the county seat and the unincorporated Lakeside CDP being the largest place.[3] It is named in honor of Henry Clay, a famous American statesman, member of the United States Senate from Kentucky, and United States Secretary of State in the 19th century.

Nassau County is the northeastern most county of the U.S. state of Florida. According to the July 2022 United States Census analysis, the county's population was 97,899.

The designated county seat is Fernandina Beach. Nassau County is a constituent of the Jacksonville metropolitan area, which accommodates around 1.68 million inhabitants as of the year 2022. The county is situated in Northeast Florida with a land area of 726 square miles (1,880 km2). The county's population has surged by more than 40,000 residents since the year 2000, driven by factors such as Nassau's nearness to downtown Jacksonville, the emergence of fresh residential projects, agricultural output, prominent tourist destinations, and a broadening tax foundation through the influx of novel industrial and business enterprises to the county.[3][4] Nassau County is also a favored residential destination for military personnel stationed at bases in the adjacent Duval County, Florida (Naval Air Station Jacksonville, Naval Station Mayport) and Camden County, Georgia (Naval Submarine Base Kings Bay). Nassau County will celebrate 200 years with its bicentennial celebration in 2024.