Estimate your St. Johns County property tax with homestead exemptions, by city — and your savings if Amendment 3 passes.
School taxes are 6.27 mills everywhere in St. Johns County. County-wide levies add 5.57 mills; cities and unincorporated areas add their own.
| Area | Non-school mills | School mills | Total mills |
|---|---|---|---|
| Unincorporated St. Johns County (average) | 6.96 | 6.27 | 13.24 |
| City of St Augustine | 13.07 | 6.27 | 19.34 |
| City of St Augustine B | 8.07 | 6.27 | 14.34 |
One mill = $1 per $1,000 of taxable value. Rates are 2025 levies from the Florida Department of Revenue; some special districts vary inside the county.
Taxable value × millage rate ÷ 1,000. Taxable value is your assessed value minus exemptions. With a homestead, the first $25,000 is exempt from all taxes and an additional exemption (up to $26,411 in 2026) applies to assessed value above $50,000 for non-school taxes.
It uses the 2025 tax rates published by the Florida Department of Revenue for each county and city. Some local special districts and MSTUs vary inside a county, so your real bill can differ by a few percent. Your TRIM notice is the official number.