104,376 people (2024 Census estimate, +14.7% since 2020)
649 square miles of land · 161 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
11 active community water systems list Nassau County in the area they serve, reporting 61,464 people served in all (a system that crosses county lines counts its whole population).
| JEA: LOFTON OAKS GRID groundwater · private · FL2454338 | 24,318 served |
| FERNANDINA BEACH WTP groundwater · local government · FL2450364 | 21,925 served |
| NASSAU-AMELIA UTILITIES groundwater · private · FL2450022 | 9,750 served |
| HILLIARD WTP groundwater · local government · FL2451179 | 3,036 served |
| CALLAHAN WTP groundwater · local government · FL2450146 | 1,730 served |
| MARSH COVE CONDOS groundwater · private · FL2451322 | 350 served |
| DAYSPRING VILLAGE groundwater · private · FL2454138 | 121 served |
| TEAKWOOD MHP groundwater · private · FL2451147 | 80 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 237 people were held in Nassau County's jail, in Vera's latest figure (2026). In 2021 it was about 232.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
1 school district has its office in Nassau County. School taxes are usually the largest part of a property tax bill.
Spent $150.8 million — $127.3 million to run schools, about $10,049 per student, plus $19.2 million on buildings and equipment. Money in: $93.6 million local (mostly property tax), $51 million state, $15.9 million federal. Long-term debt: $11.3 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Nassau County about $24.5 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
106 bridges in Nassau County: 52 in good condition, 51 fair, and 3 poor (2.8%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| CR 121 over DEEP CREEK · built 1949 | 2,500 vehicles a day |
| STOKES ROAD over ST. MARYS RIVER · built 1978 | 110 vehicles a day |
| CRANDALL ROAD over MCQUEEN SWAMP · built 1973 | 51 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $6.9 million of work in Nassau County in fiscal 2025, about $76 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
General election: Tuesday, November 3, 2026. Last day to register to vote: 2026-10-05. Vote-by-mail request due by 5 pm: 2026-10-22. Early voting — the statewide minimum: 2026-10-24 to 2026-10-31. Election Day — and mail ballots must arrive: 2026-11-03.
Source: Florida Division of Elections — election dates · WPTV, 2026 deadlines · Florida Division of Elections — early voting
The budget, property tax rates, audits, local officials and offices for Nassau County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Nassau County built: brayden.ozark@gmail.com.
More of Florida: the state government and every county in Florida.
Nearby counties: Duval County (20 mi) · Camden County, GA (22 mi) · Charlton County, GA (25 mi) · Baker County (37 mi) · Brantley County, GA (43 mi) · Clay County (43 mi).