334,928 people (2024 Census estimate, +20.9% since 2020)
601 square miles of land · 558 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.
21 active community water systems list St. Johns County in the area they serve, reporting 218,557 people served in all (a system that crosses county lines counts its whole population).
| SJCU-CR214 MAINLAND WTP groundwater · local government · FL2554447 | 66,953 served |
| SJCU-NORTHWEST UTILITIES WTP groundwater · local government · FL2554471 | 48,040 served |
| ST. AUGUSTINE WS groundwater · local government · FL2550210 | 43,069 served |
| SJCU-PONTE VEDRA WS groundwater · private · FL2554343 | 15,565 served |
| SJCU-NORTHEAST UTILITIES WS buys groundwater · local government · FL2554475 | 14,790 served |
| SJCU-SAWGRASS GRID groundwater · private · FL2551004 | 13,023 served |
| JEA: PONTE VEDRA GRID groundwater · private · FL2550908 | 5,395 served |
| SJCU-NORTH BEACH UTILITIES groundwater · public/private · FL2550812 | 4,200 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 367 people were held in St. Johns County's jail, in Vera's latest figure (2026). In 2021 it was about 408.
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 St. Johns County. School taxes are usually the largest part of a property tax bill.
Spent $640.7 million — $501 million to run schools, about $9,989 per student, plus $99.1 million on buildings and equipment. Money in: $376.6 million local (mostly property tax), $245 million state, $43.7 million federal. Long-term debt: $210.8 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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost St. Johns County about $97 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
141 bridges in St. Johns County: 86 in good condition, 53 fair, and 2 poor (1.4%). “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.
| US-1 (SR-5) over OYSTER CREEK · built 1958 | 43,000 vehicles a day |
| US-1 BUS. & SR-5A over SAN SEBASTIAN RIVER · built 1949 | 16,500 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $72.6 million of work in St. Johns County in fiscal 2025, about $266 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 St. Johns 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 St. Johns County built: brayden.ozark@gmail.com.
More of Florida: the state government and every county in Florida.
Nearby counties: Putnam County (29 mi) · Clay County (29 mi) · Flagler County (29 mi) · Duval County (34 mi) · Bradford County (46 mi) · Nassau County (54 mi).