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Nassau County is a county in the state of Florida. As of 2020, 90,352 people lived there. [1] . Its county seat is Fernandina Beach, Florida. [2] Nassau County is part of the Greater. This County is in the northeast part of Florida, bordering the counties of Duval, Baker, Charlton, and Camden County in Georgia. Nassau County was founded in 1824 and was named after.