California Property Tax Datasets
Everything on this site is built from public records: county assessor rolls and tax rate books, the State Board of Equalization's statistical tables, CDIAC's Mello-Roos reports, CAL FIRE's hazard maps, HCD's housing reports, DWR's well records and the Department of Insurance's filings. The aggregates we compute from them are published here as files, one row per city, county, ZIP, district or form, so that reporters, researchers, agents and agencies can use the numbers rather than retype them. Aggregates only: no parcel, owner or address data leaves the source.
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The data files below are released under Creative Commons Attribution 4.0: use them in articles, reports, maps and tools, including commercial ones; a credit to “California Property Tools” and a link to the dataset's page is all we ask. Quote the pages themselves (text, tables, calculators) the same way. Every page carries a “Cite this page” box with a ready citation, and every figure names its primary source so you can cite the county or state agency alongside us. Corrections: contact; method and change log: methodology.
The datasets
| Dataset | Unit | Vintage | Primary source | Updated | Files |
|---|---|---|---|---|---|
| Housing units permitted and completed by jurisdiction, 2018 to 2025For each of 534 California cities and counties, each year since 2018 and each unit type (single-family detached and attached, 2–4 units, 5+ units, ADU, mobile home): units entitled, units with building permits, units completed (certificates of occupancy) and SB 9 permits, as reported to HCD in the Housing Element Annual Progress Report (Table A2). Powers the new-construction block on the city pages. | jurisdiction × year × unit type | APR years 2018–2025 | California Department of Housing and Community Development, Annual Progress Report data by jurisdiction and year | 2026-10-30 | CSV · 13,007 rows |
| Secured and unsecured roll units and values by county, 2015-16 to 2025-26For each county and roll year since 2015-16: secured-roll parcels, unsecured-roll assessments, state-assessed and locally assessed secured value, unsecured value and the total net roll; from the Board of Equalization's Table D (ten counties' unit counts filled from the BOE Distribution of Local Roll Totals where available). | county × roll year | Roll years 2015-16 to 2025-26 | California State Board of Equalization, Open Data Portal (Table D: Local Roll Value and Statistics) | 2026-10-30 | CSV · 638 rows |
| Property tax exemptions by county, 2013-14 to 2025-26For each of the 58 counties and every roll year since 2013-14: the number and value of veterans' exemptions, and the exempt value of college, low-value, church, religious, welfare (schools, hospitals, other charitable) and other exemptions, with the total as a share of the tax base; from the Board of Equalization's Table 8. | county × roll year | Roll years 2013-14 to 2025-26 | California State Board of Equalization, Open Data Portal (Exemptions, Table 8) | 2026-10-30 | CSV · 754 rows |
| Assessed value of taxable property by county, 2000-01 to 2025-26For each of the 58 counties and the statewide sum, every roll year since 2000-01: land, improvements, personal property, exemptions and net assessed value, with the year-over-year change; from the Board of Equalization's Table 5. | county × roll year | Roll years 2000-01 to 2025-26 | California State Board of Equalization, Open Data Portal (Assessed Property Values, Table 5) | 2026-10-30 | CSV · 1,534 rows |
| ADU building permits by jurisdiction, 2018 to 2025Accessory dwelling unit building permits issued by each of 516 California cities and counties, one column per year from 2018 to 2025, as reported to HCD in the Housing Element Annual Progress Report (Table A2). | jurisdiction × year | APR years 2018–2025 | California Department of Housing and Community Development, Annual Progress Report data by jurisdiction and year | 2026-10-30 | CSV · 516 rows |
| Domestic well depth by county (DWR Well Completion Reports)For every county: new domestic wells, and the 25th/median/75th-percentile completed depth, median static water level and median yield reported on DWR Well Completion Reports, by period (pre-2000 or undated, 2000–2014, 2015–present, and all years); plus the same measures by city for domestic wells completed since 2000 (cities with at least 20 wells). | county × period | Well Completion Reports filed through 2026 | California Department of Water Resources, Well Completion Reports (data.cnra.ca.gov) | 2026-10-30 | CSV · 230 rowsCSV · 570 rows |
| Mello-Roos final bond maturity by countyFor every county in CDIAC's roster: districts with a final maturity, earliest/median/latest year, counts maturing by 2030, 2031–40, 2041–50 and after 2050, special taxes due and bonds outstanding (reporting year 2024-25). | county | CDIAC reporting year 2024-25 | CDIAC Mello-Roos Yearly Fiscal Status Reports and DebtWatch | 2026-10-26 | CSV · 28 rows |
| County tax-sale calendarFor all 58 counties: the tax collector's sale page, auction platform, next scheduled sale dates, registration deadline and deposit, last-sale date and parcel counts, typical frequency and the excess-proceeds claim page, read from county pages and sale platforms. No parcel or owner data. | County | Read 2026-10-25 (2026–27 sales) | County tax collectors; Bid4Assets, GovEase and RealAuction county listings | 2026-10-25 | CSV · 58 rows |
| Unsecured property tax roll by countyUnsecured roll units and assessed value for the 48 counties that report them (58 rows; the ten that report none are blank and flagged), business personal property, boats, aircraft and possessory interests, the unsecured share of each county's local roll and the change since 2015-16, from the BOE Distribution of Local Roll Totals. | County | 2025-26 assessment year (series 2015-16 to 2025-26) | California State Board of Equalization, Annual Report, Distribution of Local Roll Totals | 2026-10-25 | CSV · 58 rows |
| Proposition 13 lock-in by cityShare of single-family homes and condos by base-year decade (or last recorded sale/document year where no base-year field is public), median base year, Homeowners' Exemption share and median taxable value for 197 cities in 8 counties. | city | 2025 rolls; Contra Costa from a live layer carrying 2026-27 values (value_roll_year column); SF series 2007–2025 | County assessor parcel data and open-data rolls | 2026-10-25 | CSV · 197 rows |
| Homeowners' Exemption claims by countyExemption claims and exempt value for all 58 counties (2000–01, 2023–24, 2024–25, 2025–26) with the ACS owner-occupied denominator and claims per 100 owner-occupied homes. | county × fiscal year | FY 2000–01 to 2025–26 | BOE Annual Report Table 9; Census ACS 2020–2024 B25003 | 2026-10-25 | CSV · 232 rows |
| City real property transfer tax schedulesThe California cities whose transfer-tax codes we have read (27 as of October 2026, more in progress), one row per tier: rate as written, thresholds, mechanism (whole price or slice), indexing, who pays, code section. | city × tier | codes as read 2026-10-23 | Municipal codes, ballot measures, county clerk-recorders | 2026-10-25 | CSV · 61 rows |
| BOE property-tax forms inventoryAll 48 Board of Equalization property-tax forms with revision, who files, where, and the verbatim statutory deadline and late-filing rule. | form | 2026 revisions | BOE forms index and LTA 2026/004; Revenue and Taxation Code | 2026-10-25 | CSV · 48 rows |
| Williamson Act and open-space restricted land by countyParcels and assessed value in the BOE's restricted class (Williamson Act and Farmland Security Zone contracts, timberland zones) for all 58 counties, with agricultural parcels and the restricted share of the rural roll. | county | 2025–26 | BOE Annual Report Table E4 | 2026-10-25 | CSV · 58 rows |
| Los Angeles County property tax by areaTypical ad-valorem rate (p10/median/p90), median assessed value and typical bill by city, community and ZIP, by residential type. | area × property type | 2025 roll; FY 2025–26 rates | LA County Assessor roll; Auditor-Controller tax rate book | 2026-10 | CSV · 1,141 rows |
| Sacramento County property tax by areaThe same measures for Sacramento County's cities, communities and ZIPs. | area × property type | 2025 roll; FY 2025–26 rates | Sacramento County Assessor secured roll; Auditor-Controller | 2026-10 | CSV · 168 rows |
| Mello-Roos (CFD) debt, special taxes and delinquency by countyCommunity Facilities Districts per county with bonds outstanding, special taxes levied, delinquency and foreclosure counts. | county / district | CDIAC reporting year 2024–25 | California Debt and Investment Advisory Commission | 2026-10 | JSON |
| Los Angeles County CFD special taxesEvery Mello-Roos line on the Auditor-Controller's direct assessment list for LA County. | district | FY 2025–26 | LA County Auditor-Controller | 2026-10 | JSON |
| Sacramento County CFD special taxesEvery Mello-Roos line on Sacramento County's direct levy district listing. | district | FY 2025–26 | Sacramento County Department of Finance | 2026-10 | JSON |
| FAIR Plan policies in force by county and ZIPDwelling policies in force 2021–2025 by ZIP and county, with the Department of Insurance's 2022 share of dwellings on the FAIR Plan. | ZIP / county | FY 2021 – Sept 30, 2025 | California FAIR Plan Association; CDI | 2026-10 | JSON |
| Home insurance non-renewal rates by county and ZIPInsurer-initiated non-renewal rates 2015–2023 by ZIP and county. | ZIP / county | 2015–2023 | California Department of Insurance | 2026-10 | JSON |
| Fire Hazard Severity Zone shares by county, place and ZIPShare of area and housing units in each CAL FIRE hazard class, by county, Census place and ZCTA. | place / ZCTA | SRA map 2024; LRA recommendations 2025 | CAL FIRE / OSFM; Census Bureau | 2026-10 | JSONJSON |
| Property tax rate changes by Tax Rate Area, FY 2025-26 to 2026-27For every Tax Rate Area with parcels in the counties whose 2026-27 rate book is in our data (16 so far): the ad-valorem rate both years, the change in points and the parcel count; county and community medians and the levy changes behind them on the page. | Tax Rate Area | FY 2025-26 and FY 2026-27 rate books | County Auditor-Controller rate books; 2025 Assessor roll aggregates for parcel weights | 2026-10-30 | CSV · 12,355 rows |
| Tax Rate Area rate explainers, 58 countiesFor each county, every Tax Rate Area's total rate and its levy lines (the 1% base and each voter-approved debt), as published by the county auditor; one JSON file per county (…/data/{county}-rate-explainer.json). | Tax Rate Area | FY 2026–27 for the re-based counties, FY 2025–26 for most others (a few FY 2024–25) | County auditor-controller tax rate books | 2026-10 | JSONJSON |
Files are regenerated when their source changes; the page linked in each row explains the method, the caveats and what a blank cell means. Column names are in the first row of each CSV. The 28 county Mello-Roos pages and the 57 Tax Rate Area explorers also carry Dataset schema for their own files.