98040 Property Tax Rate
Mercer Island, Washington · Part of King County
Effective Tax Rate
0.53%
178.4% above state avgMedian Annual Tax
$10,001
$833/mo escrow
Estimate Your Tax
Annual Tax
$10,001
Monthly
$833
Eff. Rate
0.53%
Buyer decision brief
What ZIP 98040 means for your housing budget
Use this ZIP page to compare recurring tax burden before you compare listing prices. The numbers below are Census ZCTA estimates, so they are strongest for neighborhood comparison and weakest for parcel-specific tax planning.
Monthly escrow signal
$833/mo
Based on median annual tax paid
State context
0.23 percentage points below the Washington average
Washington average: 0.77%
Data confidence
Reference estimateCensus suppressed or did not publish a usable tax margin of error for this row. Treat the ZIP estimate as directional.
Verify before you offer
- Confirm parcel assessed value with King County assessor.
- Check homestead, senior, veteran, and disability exemptions.
- Ask whether purchase triggers reassessment or value-cap reset.
- Review school district and special assessment boundaries.
Lower-rate similar ZIPs
This is informational content, not tax, legal, or mortgage advice. Local assessor records remain the source of truth for a specific property.
Data confidence ledger
Can you trust ZIP 98040 for comparison?
ACS vintage
2019-2023 ACS 5-Year Estimates
Five-year Census ZCTA estimates.
ZCTA caveat
Census area, not parcel boundary
USPS ZIP routes and taxing districts can differ inside the same area.
Field completeness
3/3 required fields
Median tax, home value, and derived rate are present.
MOE status
MOE unavailable or suppressed
Census suppressed or did not publish a usable tax MOE for this ZCTA.
Last site refresh
March 10, 2026
Dataset and page-quality audit run locally before publication.
County fallback
County context only
King County is used for assessor verification and broader context.
Tax bill anatomy
What can change your actual bill in ZIP 98040
Use the ZIP estimate to compare neighborhoods, then verify these parcel-level inputs before relying on a payment estimate.
Assessed value
The ZCTA median home value is $1,884,200, but your bill starts with the local assessed value for a specific parcel.
Effective rate
The displayed rate is 0.53%, derived from median tax paid divided by median home value.
Exemptions
Homestead, senior, veteran, disability, and local exemptions can reduce taxable value. Confirm eligibility before estimating escrow.
Reassessment
A purchase can change assessed value depending on Washington and county rules. Ask how sale price affects the next assessment cycle.
Escrow impact
The median tax paid in this ZCTA equals about $833 per month before insurance, HOA dues, or special assessments.
Assessor verification
King County assessor or tax collector records are the source of truth for parcel taxes, appeal windows, and exemptions.
How ZIP 98040 Compares
Median Annual Property Tax
ZIP 98040
0.53%
Effective rate
Washington Avg
0.77%
Effective rate
National Avg
1.10%
Effective rate
State Ranking
Property Tax Rank in Washington
Lower than 94% of ZIP codes in Washington(6th percentile, 538 ZIPs compared)
Property Tax Analysis
Property Tax Insights for ZIP 98040
Property owners in ZIP code 98040 (Mercer Island, Washington) pay a median of $10,001/year in property taxes on homes valued at $1,884,200. This translates to an effective tax rate of 0.53%, which is 31% below the Washington state average of 0.77%.
The monthly property tax burden for a median-valued home in 98040 is approximately $833, which factors into escrow payments on mortgages. This ZIP code is located within King County. This is $6,409 more than the Washington average of $3,592/year.
Compared to similar ZIP codes in Washington, 98040 has lower property taxes. ZIP codes with similar effective rates include 98650 (0.53%) and 99167 (0.53%).
In Mercer Island, property taxes represent approximately 4.9% of the median household income of $202,359, providing context for the relative tax burden on homeowners in this area.
If you're considering purchasing a home in 98040, keep in mind that property taxes are based on the assessed value assigned by the local assessor, which may differ from the purchase price. In some states, properties are reassessed at or near the sale price upon transfer of ownership. For the most current tax information for a specific property, consult King County's tax assessor directly.
Frequently Asked Questions
What is the property tax rate in ZIP code 98040?
How much are property taxes in Mercer Island, WA (98040)?
How does ZIP 98040 compare to the Washington average?
What is the median home value in ZIP 98040?
What county is ZIP code 98040 in?
Margin of Error
The median property tax estimate for this ZIP code has a margin of error of ±-$333,333,333. ZCTA-level data has wider margins than county-level estimates due to smaller sample sizes.
County-Level Data
ZIP code 98040 is part of King County, Washington. View the full county profile for broader context and more data.
View King County on TaxByCounty →Why compare these ZIPs?
Better comparison set for ZIP 98040
Each ZIP highlights a homebuyer tradeoff: lower rate, stronger value context, shared county rules, city boundary changes, or nearby missing data.
98004
Bellevue, WA
0.03 percentage points lower than ZIP 98040.
Rate
0.50%
Tax
$10,001
Quality
82
98039
Medina, WA
0.03 percentage points lower than ZIP 98040.
Rate
0.50%
Tax
$10,001
Quality
68
98650
Trout Lake, WA
0.00 percentage points lower than ZIP 98040.
Rate
0.53%
Tax
$3,547
Quality
79
99167
Rice, WA
Within 0.00 percentage points of ZIP 98040.
Rate
0.53%
Tax
$1,621
Quality
77
98288
Skykomish, WA
Both ZIPs use King County for assessor context.
Rate
0.54%
Tax
$2,382
Quality
77
99181
Valley, WA
Within 0.01 percentage points of ZIP 98040.
Rate
0.54%
Tax
$1,376
Quality
77
98814
Carlton, WA
Within 0.01 percentage points of ZIP 98040.
Rate
0.54%
Tax
$2,770
Quality
73
98279
Olga, WA
Within 0.01 percentage points of ZIP 98040.
Rate
0.54%
Tax
$4,444
Quality
77
Data from U.S. Census Bureau, American Community Survey 2019-2023 5-Year Estimates (ZCTA level). ZIP Code Tabulation Areas (ZCTAs) are Census approximations of USPS ZIP codes.
Estimates are informational only and should not be used as financial or legal advice.