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County · code 12089

Nassau CountyFlorida

Nassau County is a county in Florida, with its seat in Fernandina Beach. It was formed on December 29, 1824, from Duval County and named after the Duchy of Nassau.

  • Founded1824
  • County seatFernandina Beach
  • Named forDuchy of Nassau
  • Land area649 sq mi + 77 sq mi water
  • Population90,352 2020 Census
  • Parcels mapped60,746 checked 16 October 2026
Open the free map Click any parcel in Nassau County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

DuvalCamden, GACharlton, GABaker Fernandina Beach Census outline · seat marked

Where it is

Nassau on the map of Florida

Florida has 67 counties and county equivalents, each with its own records office. Shapes with a page are links.

Alachua CountyBaker CountyBay CountyBradford CountyBrevard CountyBroward CountyCalhoun CountyCharlotte CountyCitrus CountyClay CountyCollier CountyColumbia CountyDeSoto CountyDixie CountyDuval CountyEscambia CountyFlagler CountyFranklin CountyGadsden CountyGilchrist CountyGlades CountyGulf CountyHamilton CountyHardee CountyHendry CountyHernando CountyHighlands CountyHillsborough CountyHolmes CountyIndian River CountyJackson CountyJefferson CountyLafayette CountyLake CountyLee CountyLeon CountyLevy CountyLiberty CountyMadison CountyManatee CountyMarion CountyMartin CountyMiami-Dade CountyMonroe CountyOkaloosa CountyOkeechobee CountyOrange CountyOsceola CountyPalm Beach CountyPasco CountyPinellas CountyPolk CountyPutnam CountySt. Johns CountySt. Lucie CountySanta Rosa CountySarasota CountySeminole CountySumter CountySuwannee CountyTaylor CountyUnion CountyVolusia CountyWakulla CountyWalton CountyWashington CountyNassau County Nassau
Counties of Florida · Nassau highlighted

History

Formed in 1824 from Duval County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Nassau County was created from Duval County in 1824 and gained additional territory from Duval the following year. An overlap between Nassau and Duval was corrected in 1857, and Nassau lost territory to Duval in 1859. In 1911, Nassau gained territory from Baker County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1824
    Nassau County created Nassau created by Florida Territory from Duval.
    from Duval
    · Fla. Terr. Acts 1824, 3d sess., sec. 8/p. 262
  2. 1826
    Gained territory Nassau gained from Duval.
    from Duval
    · Fla. Terr. Acts 1826, 5th sess., p. 158
  3. 1828
    Changed An overlap resulted when a single area was assigned to both Nassau and Duval.
    Duval
    · Fla. Terr. Acts 1828, 7th sess., secs. 5-6/pp. 220-221
  4. 1857
    Changed 1828 overlap between Duval and Nassau ended; based upon their most recently defined configurations, Nassau appeared to exchange with Duval, while Duval appeared to lose to Nassau.
    Duval
    · Fla. Laws 1856, 8th sess., ch. 811/p. 55
  5. 1859
    Lost territory Nassau lost to Duval.
    to Duval
    · Fla. Laws 1858, 9th sess., ch. 920/p. 55
  6. 1911
    Gained territory Nassau gained from Baker.
    from Baker
    · Fla. Laws 1911, 13th sess., ch. 6244/p. 216

Land and parcels

What the maps cover in Nassau

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Nassau by the Census

Population
90,352 2020 Census count
Housing units
41,628 2020 Census count
Land area
649 square miles
Water area
77 square miles
People per sq mi
139 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open Nassau County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Nassau County

When was Nassau County founded?
Nassau County was founded in 1824, formed from Duval County, and named after Duchy of Nassau.
What is the county seat of Nassau County?
The county seat of Nassau County is Fernandina Beach.
Is there an online parcel map for Nassau County?
Yes. Nassau County publishes a parcel map of 60,746 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Nassau County's boundary or name changed?
Nassau County was created in 1824 from Duval County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Duval County and Baker County.
Who issues building permits in Nassau County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Nassau County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door