Estimate your Seminole County property tax with homestead exemptions, by city — and your savings if Amendment 3 passes.
School taxes are 5.25 mills everywhere in Seminole County. County-wide levies add 5.55 mills; cities and unincorporated areas add their own.
| Area | Non-school mills | School mills | Total mills |
|---|---|---|---|
| Unincorporated Seminole County (average) | 7.55 | 5.25 | 12.80 |
| City of Altamonte Springs | 9.55 | 5.25 | 14.80 |
| City of Casselberry | 9.55 | 5.25 | 14.80 |
| City of Lake Mary | 9.14 | 5.25 | 14.39 |
| City of Longwood | 11.05 | 5.25 | 16.30 |
| City of Oviedo | 11.42 | 5.25 | 16.66 |
| City of Sanford | 12.88 | 5.25 | 18.13 |
| City of Winter Springs | 8.17 | 5.25 | 13.42 |
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.