Napa Property Tax Rate by ZIP Code
The Napa County property tax rate isn't one number — it's the 1% Proposition 13 base plus each area's voter-approved debt, so it varies by ZIP. Below is the typical ad-valorem rate for 8 Napa County ZIP codes, from the Auditor-Controller tax rates, with a typical assessed value and bill for each. Enter your ZIP and home value below to estimate your own bill, or search the table.
Quick answer: across 8 Napa County ZIP codes the typical property tax rate runs about 1.0523%–1.1266% of assessed value (median 1.1129%). It's highest in ZIP 94558 (Napa) at 1.1266% and lowest in 94508 (Unincorporated) at 1.0187%.
Ad-valorem only (excludes Mello-Roos and parcel taxes); a typical rate for the ZIP, not your parcel's exact Tax Rate Area.
Enter your ZIP code to see its typical property tax rate and estimate your bill.
Highest and lowest property tax ZIP codes in Napa County
Ranked by typical ad-valorem rate (1% Proposition 13 base plus each area's voter-approved debt). A higher rate reflects more voter-approved school and municipal bonds in that area — not a higher assessment.
| Highest rates · ZIP | Area | Rate |
|---|---|---|
| 94558 | Napa | 1.1266% |
| 94559 | Napa | 1.1266% |
| 94503 | American Canyon | 1.1129% |
| 94599 | Yountville | 1.0912% |
| 94515 | Calistoga | 1.0823% |
| Lowest rates · ZIP | Area | Rate |
|---|---|---|
| 94508 | Unincorporated | 1.0187% |
| 94567 | Unincorporated | 1.0374% |
| 94574 | St Helena | 1.062% |
| 94515 | Calistoga | 1.0823% |
| 94599 | Yountville | 1.0912% |
Showing 8 of 8 ZIP codes.
| ZIP | Area | Typical rate | Typical home value | Typical annual tax |
|---|---|---|---|---|
| 94503 | American Canyon | 1.1129% | $362,973 | $4,040 |
| 94508 | Unincorporated | 1.0187–1.0523% | — | — |
| 94515 | Calistoga | 1.0823% | $639,955 | $6,926 |
| 94558 | Napa | 1.1116–1.1266% | $662,881 | $7,468 |
| 94559 | Napa | 1.1116–1.1266% | $518,242 | $5,839 |
| 94567 | Unincorporated | 1.0374–1.0523% | — | — |
| 94574 | St Helena | 1.0523–1.062% | $952,466 | $10,115 |
| 94599 | Yountville | 1.0912% | $849,406 | $9,269 |
How precise is this? A ZIP can span several Tax Rate Areas, so the figure above is typical for the ZIP, not your parcel's exact rate. To see the exact rate by Tax Rate Area — or look up your parcel by APN — use the Napa rate explorer →
Frequently Asked Questions
What is the property tax rate in Napa County by ZIP code?
Across Napa County the ad-valorem property tax rate for most ZIPs runs about 1.0523% to 1.1266% of assessed value (the middle 80% of ZIPs), with a median near 1.1129% — the 1% Proposition 13 base plus each area's voter-approved debt. It varies by ZIP because voter-approved school, city, and special-district bonds differ from area to area.
Why does the property tax rate differ by ZIP code?
The 1% Proposition 13 base is the same everywhere, but each Tax Rate Area adds its own voter-approved bond debt (school districts, the Napa Valley College District, water and fire districts, county and city bonds). ZIP codes in areas with more approved bonds have higher total rates. A single ZIP can span more than one Tax Rate Area, so the figure shown is a typical rate for that ZIP, not your parcel's exact rate.
Are Mello-Roos and special assessments included in these rates?
No. These are ad-valorem rates only (the 1% base plus voter-approved debt). Mello-Roos / Community Facilities District special taxes, parcel taxes, and fixed direct assessments are billed separately and can add hundreds to a few thousand dollars a year.
Are the typical values single-family only?
The headline typical value and bill are for single-family homes. Where there's enough data, the calculator also shows condos and 2–4 unit residential-income properties for your ZIP, using each type's median assessed value from the Napa Assessor use code — an existing-owner Proposition 13 figure, not a buyer's price.
Learn More
Educational estimates only, not official bills. Rates are ad-valorem only (excluding Mello-Roos, parcel taxes, and fixed direct assessments) and are typical for the ZIP, not your parcel's exact Tax Rate Area. Typical values are existing-owner Proposition 13 figures, not a buyer's price. Source: Napa County Auditor-Controller tax rates and the Napa County Assessor 2025 roll.