California · County guide
Mariposa County, California property tax appeals
A Mariposa County property tax appeal starts with the Mariposa County Board of Equalization (Board of Supervisors). The next deadline is Nov 30, 2026 for the Mariposa County Board of Equalization (Board of Supervisors). The filing fee is $30.
This season
- Next deadline
- Nov 30, 2026
- Open now
- Mariposa County Board of Equalization (Board of Supervisors)
Opens Jul 2, 2026Closes Nov 30, 2026
- Source: Letter To Assessors No. 2026/023: County Assessment Appeals Filing Period for 2026 (BOE, June 2, 2026)Last checked
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- Filing fee
- $30
- Where to file first
- Mariposa County Board of Equalization (Board of Supervisors)
- Office address
- 209-966-3222
- Our coverage
- Free check available
- Independent guide — not affiliated with Mariposa County or any government agency.
- Last updated
- October 1, 2026
- Sources last checked
- October 1, 2026
- Status
- Verified guide
When and where do I file a Mariposa County property tax appeal?
Who hears a Mariposa County appeal?
One stage. We are not affiliated with this office.
Who hears it: Mariposa County Board of Equalization (Board of Supervisors)
Filing: appeal
Open nowWhere is the Mariposa County office?
Mariposa County Board of Equalization (Board of Supervisors)[3]
- Phone
- 209-966-3222
- Online
- Official website
Assessor[5]
Mariposa County Assessor-Recorder Office public counter
- Address
- 4982 10th Street, Mariposa, CA 95338
- Phone
- 209-966-2332
We are not affiliated with this office. Hours can change, so call before you visit.
Which Mariposa County filing windows are coming up?
| Closes | Area | Who hears it | Status |
|---|---|---|---|
| Nov 30, 2026 | Countywide | Mariposa County Board of Equalization (Board of Supervisors) · Official source · Last checked Sep 29, 2026 | Open now |
When were past Mariposa County deadlines?
| Tax year | Window | Office |
|---|---|---|
| 2025 | Closed December 1, 2025 | Mariposa County Board of Equalization (Board of Supervisors) |
| 2024 | Closed December 2, 2024 | Mariposa County Board of Equalization (Board of Supervisors) |
| 2023 | Closed November 30, 2023 | Mariposa County Board of Equalization (Board of Supervisors) |
When is the deadline to appeal a property tax assessment in Mariposa County?
The soonest deadline we list: Mariposa County, Mariposa County Board of Equalization (Board of Supervisors) — Closes November 30, 2026.
- When a filing counts as on timeMariposa County Board of Equalization (Board of Supervisors)
- Mariposa County treats applications postmarked by the last day of the filing period as filed on time.[1]
- Deadline detailMariposa County Board of Equalization (Board of Supervisors) · Filing period
- Mariposa County's page lists the regular filing period as July 2 to December 1; the state letter for 2026 lists November 30.[1]
Who decides a property tax appeal in Mariposa County?
Mariposa County Board of Equalization (Board of Supervisors): The Mariposa County Board of Equalization's decision is final and not reheard; the owner or the Mariposa County Assessor may seek review in superior court. Mariposa County Board of Equalization (Board of Supervisors): In Mariposa County the filing is an assessment appeal on the Assessment Appeal Application (BOE-305-AH), heard by the Mariposa County Board of Equalization.
- Appeal stepsMariposa County Board of Equalization (Board of Supervisors)
- The Mariposa County Board of Equalization's decision is final and not reheard; the owner or the Mariposa County Assessor may seek review in superior court.[2]
- What the appeal is calledMariposa County Board of Equalization (Board of Supervisors)
- In Mariposa County the filing is an assessment appeal on the Assessment Appeal Application (BOE-305-AH), heard by the Mariposa County Board of Equalization.[2]
How do I file a property tax appeal in Mariposa County?
Mariposa County Board of Equalization (Board of Supervisors): In Mariposa County you mail the paper application to the Clerk of the Board; an application postmarked by the last day of the filing period is on time. Mariposa County Board of Equalization (Board of Supervisors): Mariposa County publishes its own copy of the Assessment Appeal Application (BOE-305-AH) with filing instructions.
- How to fileMariposa County Board of Equalization (Board of Supervisors)
- In Mariposa County you mail the paper application to the Clerk of the Board; an application postmarked by the last day of the filing period is on time.[1]
- FormsMariposa County Board of Equalization (Board of Supervisors)
- Mariposa County publishes its own copy of the Assessment Appeal Application (BOE-305-AH) with filing instructions.[2]
- Filing feeMariposa County Board of Equalization (Board of Supervisors)
- Mariposa County charges a $30 non-refundable filing fee; applications sent without payment are invalid.[1]
- Who may fileMariposa County Board of Equalization (Board of Supervisors)
- On the Mariposa County application, an agent must be authorized in writing unless the agent is a California attorney or the owner's spouse, child, parent or registered domestic partner.[2]
- Informal reviewMariposa County Board of Equalization (Board of Supervisors)
- In Mariposa County you can ask the Assessor for an informal Prop 8 review between January 1 and November 30 for that year's assessment.[3]
- HearingsMariposa County Board of Equalization (Board of Supervisors) · Schedule
- Mariposa County's Board of Equalization schedules appeal hearings as needed, and the Clerk of the Board generally sends written notice about 45 days before the hearing.[1]
What evidence counts in Mariposa County, and can the value go up?
What evidence can I use in Mariposa County?
Mariposa County Board of Equalization (Board of Supervisors): Mariposa County's instructions ask for comparable sales, cost and income data, where relevant, to support the owner's opinion of value. Mariposa County Board of Equalization (Board of Supervisors) · Exchange: Before a Mariposa County hearing, the owner may ask for an exchange of information with the Assessor; above $100,000 of assessed value the Assessor may start one.
- Evidence acceptedMariposa County Board of Equalization (Board of Supervisors)
- Mariposa County's instructions ask for comparable sales, cost and income data, where relevant, to support the owner's opinion of value.[2]
- Evidence ruleMariposa County Board of Equalization (Board of Supervisors) · Exchange
- Before a Mariposa County hearing, the owner may ask for an exchange of information with the Assessor; above $100,000 of assessed value the Assessor may start one.[2]
Can my assessment go up if I appeal in Mariposa County?
Mariposa County Board of Equalization (Board of Supervisors): Mariposa County's appeal instructions say the Mariposa County Board of Equalization can raise, lower or keep the assessment, depending on the hearing evidence.
- Can the value go up?Mariposa County Board of Equalization (Board of Supervisors)
- Mariposa County's appeal instructions say the Mariposa County Board of Equalization can raise, lower or keep the assessment, depending on the hearing evidence.[2]
Which exemptions can lower my bill without an appeal?
A Mariposa County owner who lives in the home can apply for an exemption of up to $7,000 of assessed value; new owners are mailed an application.
- Homeowner exemption
- A Mariposa County owner who lives in the home can apply for an exemption of up to $7,000 of assessed value; new owners are mailed an application.[4]
What do Mariposa County property taxes and assessments look like?
Figures from public records and the Census, each with its source. They describe the county's homes as a group, not the value of any one home.
How much could a lower assessment save on Mariposa County property taxes?
Tax rate used: 1.031% of assessed value (county average, fiscal 2024-25).
| Example | Tax saved |
|---|---|
| $10,000 less assessed value | $103 a year |
| 10% less on a home assessed at $387,900 (the Census median home value) | $400 a year |
These are examples: the tax rate times a lower assessed value. Exemptions, credits, caps and phase-ins can make the real change smaller. This is not a prediction for any home. Rate source: BOE Annual Report 2024-25, Table 14: average tax rate by county (Property Tax Allocations, BOE Open Data Portal).
What do homeowners in Mariposa County pay in property tax?
The median owner-occupied home in Mariposa County was worth $387,900, and the median property tax its owners paid was $2,377 a year, according to the Census Bureau's American Community Survey.
- Median home value
- $387,900
- Margin of error ±$21,367.
- Median property tax paid per year
- $2,377
- Margin of error ±$161.
- Median tax as a share of median value
- 0.61%
- A ratio of two medians, not a tax rate. Your own bill depends on your assessment and local levies.
- Owner-occupied homes
- 5,611
- Margin of error ±355.
These are survey estimates of what owners reported about their own homes. They are not assessed values, not tax rates, and not an opinion of what any home is worth.
They cannot tell you whether your own assessment is fair. That takes a comparison with similar homes, which we offer only in counties we have researched.
Median home value: Mariposa County compared
- Mariposa County$387,900
- Typical California county$481,100
- Typical US county$185,300
Typical California county $481,100; Mariposa County $387,900; Typical US county $185,300
Median property tax paid: Mariposa County compared
- Mariposa County$2,377
- Typical California county$3,294
- Typical US county$1,619
Typical California county $3,294 a year; Mariposa County $2,377 a year; Typical US county $1,619 a year
Mariposa County filing windows on a calendar
- Open
- Opens soon
- Forecast
- Mariposa County Board of Equalization (Board of Supervisors)Nov 30, 2026 · Open now
The dashed line marks today.
Mariposa County Board of Equalization (Board of Supervisors): Nov 30, 2026
How often is property reassessed in Mariposa County?
Proposition 8 review: Once Mariposa County enrolls a Prop 8 reduced value, it re-reviews the property every January 1. On the Mariposa County application, a regular (decline-in-value) appeal concerns the value as of January 1 of the current year.
- Reassessment cycleProposition 8 review
- Once Mariposa County enrolls a Prop 8 reduced value, it re-reviews the property every January 1.[3]
- Valuation date
- On the Mariposa County application, a regular (decline-in-value) appeal concerns the value as of January 1 of the current year.[2]
- Level of assessmentDecline in value
- Mariposa County's Assessor must enroll the lower of the factored Prop 13 base year value and the January 1 market value each year.[3]
Homes in Mariposa County
From the Census Bureau's American Community Survey: how old the homes are, what kind they are, what owners say they are worth and the property taxes they pay. These figures describe all homes together, not any one home.
- Median year built
- 1986
- All housing units, owned and rented
- Single-family houses, detached or attached
- 76%
- of 9,836 housing units
- Owned homes with a mortgage or similar loan
- 56%
- of 5,611 owner-occupied homes
Home values reported by owners
- Less than $50,0003%
- $50,000 to $99,9992%
- $100,000 to $199,9997%
- $200,000 to $299,99919%
- $300,000 to $399,99921%
- $400,000 to $499,99920%
- $500,000 to $749,99917%
- $750,000 to $999,9996%
- $1,000,000 to $1,999,9992%
- $2,000,000 or more2%
Home values reported by owners in Mariposa County: Less than $50,000 3%; $50,000 to $99,999 2%; $100,000 to $199,999 7%; $200,000 to $299,999 19%; $300,000 to $399,999 21%; $400,000 to $499,999 20%; $500,000 to $749,999 17%; $750,000 to $999,999 6%; $1,000,000 to $1,999,999 2%; $2,000,000 or more 2%.
Property taxes owners pay a year
- No real estate taxes6%
- Less than $80010%
- $800 to $1,49918%
- $1,500 to $1,99910%
- $2,000 to $2,99926%
- $3,000 or more31%
Property taxes owners pay a year in Mariposa County: No real estate taxes 6%; Less than $800 10%; $800 to $1,499 18%; $1,500 to $1,999 10%; $2,000 to $2,999 26%; $3,000 or more 31%.
Source: U.S. Census Bureau, American Community Survey (2020–2024 5-year estimates, tables B25075, B25102, B25035, B25024 and B25081), retrieved Oct 1, 2026. Survey estimates have a margin of error.
More questions about Mariposa County property tax appeals
When is the Mariposa County property tax appeal deadline?
The Mariposa County Board of Equalization (Board of Supervisors) window closes November 30, 2026.[6][7]
Is there a fee to file a property tax appeal in Mariposa County?
Mariposa County charges a $30 non-refundable filing fee; applications sent without payment are invalid.[1]
Where do I file an assessment appeal in Mariposa County?
In Mariposa County you mail the paper application to the Clerk of the Board; an application postmarked by the last day of the filing period is on time.[1]
Can my assessed value go up if I appeal in Mariposa County?
Mariposa County's appeal instructions say the Mariposa County Board of Equalization can raise, lower or keep the assessment, depending on the hearing evidence.[2]
What other rules apply in Mariposa County?
Mariposa County Board of Equalization (Board of Supervisors): Filing a Mariposa County appeal does not postpone the tax bill: taxes are still due by the dates on the bill.
- Paying the tax while you appealMariposa County Board of Equalization (Board of Supervisors)
- Filing a Mariposa County appeal does not postpone the tax bill: taxes are still due by the dates on the bill.[2]
Property tax guides for Mariposa County homeowners
- How Comparable Homes Are Chosen, and Why It MattersCalifornia · Mariposa County
- How to Appeal Your Property Taxes YourselfCalifornia · Mariposa County
- Assessed Value vs. Market Value: How They Differ by StateCalifornia · Mariposa County
- Homestead and Other Exemptions to Check FirstCalifornia · Mariposa County
- Homestead Exemption: What It Is and How to Get ItCalifornia · Mariposa County
- How to Lower Your Property Taxes: What to Check FirstCalifornia · Mariposa County
Counties next to Mariposa County
- Tuolumne County property tax appealsFree check availableNext deadline: Nov 30, 2026
- Madera County property tax appealsFree check availableNext deadline: Nov 30, 2026
- Merced County property tax appealsFree check availableNext deadline: Nov 30, 2026
- Stanislaus County property tax appealsFree check availableNext deadline: Nov 30, 2026
Check a Mariposa County home free
You decide and file yourself.
Where do these facts come from?
- [1]Board of Equalization | Mariposa County, CA - Official WebsiteOfficial guide or FAQ · last checked Oct 1, 2026
- [2]Assessment Appeal Application (BOE-305-AH) with instructions (Mariposa County, PDF)Official notice, form, calendar or rules · last checked Sep 29, 2026
- [3]Prop 8 Review Process | Mariposa County, CA - Official WebsiteOfficial guide or FAQ · last checked Sep 29, 2026
- [4]Assessor | Mariposa County, CAOfficial guide or FAQ · last checked Sep 29, 2026
- [5]Maps & Property Information | Mariposa County, CA - Official WebsiteOfficial guide or FAQ · last checked Oct 1, 2026
- [6]Letter To Assessors No. 2026/023: County Assessment Appeals Filing Period for 2026 (BOE, June 2, 2026)Official notice, form, calendar or rules · last checked Sep 25, 2026
- [7]Publication 30: Residential Property Assessment Appeals (California State Board of Equalization, February 2020)Official guide or FAQ · last checked Sep 25, 2026
- [8]Letter To Assessors No. 2025/020: County Assessment Appeals Filing Period for 2025 (BOE, July 7, 2025)Official notice, form, calendar or rules · last checked Oct 1, 2026
- [9]Letter To Assessors No. 2024/022: County Assessment Appeals Filing Period for 2024 (BOE, June 25, 2024)Official notice, form, calendar or rules · last checked Oct 1, 2026
- [10]Letter To Assessors No. 2023/023: County Assessment Appeals Filing Period for 2023 (BOE, June 22, 2023)Official notice, form, calendar or rules · last checked Oct 1, 2026
- 11.U.S. Census Bureau, ACS 2020–2024 5-year estimates, table B25077: Median value (dollars), owner-occupied housing units — Mariposa County, California
- 12.U.S. Census Bureau, ACS 2020–2024 5-year estimates, table B25103: Median real estate taxes paid, owner-occupied housing units — Mariposa County, California
- 13.U.S. Census Bureau, ACS 2020–2024 5-year estimates, table B25003: Tenure (owner- and renter-occupied housing units) — Mariposa County, California
Data credits: Census ACS (public domain) · Census county adjacency (public domain)
Not affiliated with Mariposa County or any government agency. Not legal advice. Not an appraisal.