Nassau County is the northeasternmost county of the U.S. state of Florida. According to the 2020 United States Census, the county's population was 90,352. The county seat and the largest incorporated city is Fernandina Beach. Nassau County is part of the Jacksonville metropolitan area, which was home to 1,534,701 people in 2018. The county is situated in Northeast Florida with a land area of . Population growth in the county has increased by over 28,000 residents since the year 2000 as a result of Nassau's proximity to downtown Jacksonville, new housing developments, agricultural production, tourism locations, and a diversifying tax base with new industrial and commercial companies moving to the county. Nassau County is also a popular choice of residence for military personnel stationed on bases in neighboring Duval County, Florida (Naval Air Station Jacksonville, Naval Station Mayport) and Camden County, Georgia (Naval Submarine Base Kings Bay). History Nassau County was created in 1824 from Duval County. It was named for the Duchy of Nassau in Germany. The Battle of Alligator Bridge took place in Nassau County around Callahan on June 30, 1778, and was the only major engagement in an unsuccessful campaign to conquer British East Florida during the American Revolutionary War. In 1817, the short-lived Republic of the Floridas was established on Amelia Island. It was one of several attempts to wrestle Florida from Spanish control into the growing United States. Law and government The main environmental and agricultural body is the Nassau County Soil and Water Conservation District, which works closely with other area agencies. County Commissioners Nassau County is governed by the five-member Nassau County Board of County Commissioners, who are elected to four-year terms by the voters. The terms are staggered so that either three or two commissioners (alternately) are up for election every two years. The Nassau County Commissioners consists of the five members below: Ocean Highway & Port Authority The Ocean Highway & Port Authority (OHPA) is the independent government agency in Nassau County, Florida, that owns and operates the seaport system at the Port of Fernandina. OHPA was founded in 1941 by the Florida Legislature. The Port of Fernandina is used for terminal service for pulp and paper as well as steel exports, machinery, auto parts, chemicals, beverages, chemicals, building materials and food products. Container lines from the port serve routes to Colombia, Venezuela, the Dominican Republic, Haiti, Jamaica, Aruba, Curaçao, and