Boulevard in Fernandina Beach. Adjacent counties Camden County, Georgia – north Duval County – south/east Baker County – southwest Charlton County, Georgia – west Transportation Airports Fernandina Beach Municipal Airport Hilliard Airpark Major highways Interstate 95 Interstate 10 US 1 US 17 US 23 US 90 US 301 SR A1A SR 2 SR 15A CR 108 SR 115 CR 119 SR 200 Demographics As of the 2020 United States census, there were 90,352 people, 33,475 households, and 24,357 families residing in the county. As of the census of 2000, there were 57,663 people, 21,980 households, and 16,528 families residing in the county. The population density was 34/km2 (88/sq mi). There were 25,917 housing units at an average density of 15/km2 (40/sq mi). The racial makeup of the county was 90.0% White, 7.7% Black or African American, 0.4% Native American, 0.5% Asian, <0.1% Pacific Islander, 0.3% from other races, and 1.0% from two or more races. 1.5% of the population were Hispanic or Latino of any race. According to the 2000 Census, the largest European ancestry groups in Nassau County were: English (36.2%), Irish (13.6%) and German (11.7%). There were 21,980 households, out of which 32.8% had children under the age of 18 living with them, 61.2% were married couples living together, 9.9% had a female householder with no husband present, and 24.80% were non-families. 20.1% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 2.97. In the county, the population was spread out, with 25.0% under the age of 18, 7.2% from 18 to 24, 28.8% from 25 to 44, 26.3% from 45 to 64, and 12.6% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 97.3 males. For every 100 females age 18 and over, there were 94.8 males. As of 2021, the median income for a household in the county was $64,943. The per capita income for the county was $36,553. About 8.1% of the population were below the poverty line. Economy Nassau County's economy is very diverse, ranging from agricultural activity (mostly in the form of tree farms) in the west and central areas, to a variety of activities closer to Amelia Island. Much of the land used for tree farming