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Diamond Bar, Los Angeles County, California Property Taxes

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Property Taxes in Diamond Bar, California

  • Median Diamond Bar, California effective property tax rate: 1.30%, significantly higher than the national median of 1.02%, and higher than the California state median of 1.21%.

  • Median Diamond Bar, California home value: $506,076

  • Median annual Diamond Bar, California tax bill: $6,612, higher than the national median property tax bill of $2,400.

How are property taxes in Los Angeles calculated?

Property taxes in Diamond Bar, California are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding Diamond Bar's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Diamond Bar, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Diamond Bar, Los Angeles County, California Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.3%

Estimate Property Tax Bill

$6,579

$6,105

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Diamond Bar Property Tax Calculator Work?

Use this Diamond Bar property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Diamond Bar's median effective tax rate of 1.30% — based on actual property records in Los Angeles County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Diamond Bar's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Diamond Bar: rates range from 1.30% in 91765 to 1.30% in 91765, primarily due to differences in school district levies and local assessment districts.

If your estimate is higher than expected, Ownwell can appeal your Diamond Bar assessment — you only pay if we save you money.

About Diamond Bar Property Taxes

About Property Taxes in Diamond Bar, Los Angeles, California

Diamond Bar’s median effective property tax rate of 1.30% is higher than the California state median of 1.21% and higher than the national median of 1.02%. This rate reflects the Los Angeles County base levy combined with local school district levies and Mello-Roos Community Facility Districts that vary by subdivision throughout the city.

Property tax rates are not uniform across Diamond Bar. Homeowners in the 91765 ZIP code carry a median effective rate of 1.30%, while those in the same ZIP code pay 1.30%. This spread reflects how school district boundaries and local assessment districts are drawn across Los Angeles County. Understanding which part of Diamond Bar you live in can make a meaningful difference to your annual tax bill.

Diamond Bar homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before the December 1, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Diamond Bar, Los Angeles County, California

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Diamond Bar's effective property tax rate to other cities in California and the median property tax rates in California and the U.S.

Property Tax Rates Across Diamond Bar, Los Angeles County, California

Source: Ownwell

1.10%

1.52%

1.95%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Diamond Bar Tax Rate

1.30%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Los Angeles County Tax Rate

1.29%

Median Effective California Tax Rate

1.21%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Diamond Bar, Los Angeles County, California

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
917651.23%1.26%1.30%1.37%1.45%

Source: Ownwell

Property Tax Assessment Values Across Diamond Bar, Los Angeles County, California

When examining property taxes in Diamond Bar, California, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Los Angeles County appraisal district estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Los Angeles County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of October.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Diamond Bar.

For example, the median home price in Diamond Bar is $506,076, with tax bills ranging significantly across the county. 91765 has the highest median home price at $506,076.

Property Tax Assessment Values Across Diamond Bar, Los Angeles County, California

Source: Ownwell

$56,016

$1,480,655

$2,905,294

Median Diamond Bar Market Value

$506,076

Median Los Angeles County Market Value

$457,139

Median California Market Value

$427,605

Median United States Market Value

$235,294

Property Tax Assessment Values Across Diamond Bar, Los Angeles County, California

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
91765$217,143$328,969$506,076$766,747$1,045,483

Source: Ownwell

Property Tax Bills Across Diamond Bar, Los Angeles County, California

Property tax bills in Diamond Bar are calculated by applying the local tax rate to a home’s assessed value, which is based on the market value of the property. For homeowners, that means a higher assessed value usually leads to a higher tax bill. In Diamond Bar, the median home price is $506,076, and property tax bills can vary widely depending on the home and location.

The median property tax bill in the city is $6,612, which is well above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. Bills range from $4,472 at the 25th percentile to $9,750 at the 75th percentile, with the 90th percentile reaching $13,096. That makes it especially important for homeowners to check whether their assessed value is accurate.

Ownwell can help homeowners lower their property tax bills by reviewing assessments, identifying opportunities for appeal, and helping secure exemptions when available.

Property Tax Bills Across Diamond Bar, Los Angeles County, California

Source: Ownwell

$875

$17,017

$33,158

Median Diamond Bar Tax Bill

$6,612

Median Los Angeles County Tax Bill

$5,993

Median California Tax Bill

$5,134

Median United States Tax Bill

$2,400

Property Tax Bills Across Diamond Bar, Los Angeles County, California

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
91765$3,084$4,472$6,612$9,750$13,096

Source: Ownwell

Don't miss the deadline to appeal!

Frequently Asked Property Tax Questions in Diamond Bar, California

How are property taxes calculated in Diamond Bar, California?
Property taxes in Diamond Bar, California are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Diamond Bar, California?
To appeal your property taxes in Diamond Bar, California, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Diamond Bar, California?
Common property tax exemptions in Diamond Bar, California include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Diamond Bar, California?
Property tax deadlines in Diamond Bar, California vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Diamond Bar, California?
Ownwell provides professional property tax appeal services in Diamond Bar, California. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.