Property Tax in Mercer County, New Jersey
The median real estate tax bill in Mercer County, New Jersey is $8,804 per year, and the median home is worth $351,000. Both figures are the US Census Bureau's survey medians for owner-occupied households (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What the Mercer County numbers mean
A median is the middle household: half of owner-occupied households in Mercer County pay more than $8,804, and half pay less. Your own bill is set by your home's assessed value, the exemptions you qualify for, and the local taxing districts your property sits in — so individual bills vary widely around the median.
Dividing the median tax by the median home value gives a derived effective rate of 2.51% for Mercer County. It is an estimate built from two survey medians, not the county's official rate, but it is a fair way to compare the local tax burden with other counties where home values are very different.
The key figures for Mercer County
| Measure | Mercer County |
|---|---|
| Median real estate taxes paid per year | $8,804 |
| Median home value | $351,000 |
| Derived effective rate* | 2.51% |
| Equivalent monthly tax | $734 |
| Tax per $100,000 of value (derived) | $2,508 |
| Illustrative tax on a $400,000 home (derived rate) | $10,032 |
For context, the New Jersey medians are $9,541 of tax on $427,600 of value, and the US medians are $2,969 on $303,400. *Derived figures are estimates from Census medians, not official rates.
Mercer County at a glance
- Median tax rank in New Jersey: #11 of 21 counties
- Median home value rank in New Jersey: #13 of 21
- Population rank in New Jersey: #12 of 21 (383,286 residents)
- Population density rank: #8 of 21 (1,707 people per square mile)
- Land area rank in New Jersey: #16 of 21 (224 sq mi, 3.1% of the combined county land area)
- Median tax as a monthly figure: $734; per $1,000 of home value: $2.51
How Mercer County compares
Set against its state, Mercer County's median bill of $8,804 is about 8% lower than the New Jersey median ($9,541). Against the country as a whole it is about 197% higher than the US median ($2,969). That places the county #11 of 21 New Jersey counties ranked by median taxes paid.
Remember what drives the ranking: bills follow home values as much as rates. Mercer County's median home, at $351,000, ranks #13 by value in New Jersey, while its derived rate of 2.51% compares with a derived US figure of 0.98%.
Some extra context for Mercer County: the median bill works out to about $734 a month, and the derived rate equals roughly $2,508 of tax per $100,000 of home value. The county is home to 383,286 people — the #12 most populous county in New Jersey, spread over 224 square miles, a density of about 1,707 people per square mile. Its median home value, $351,000, ranks #13 among the state's 21 counties with data.
Zooming out: of 3133 counties nationwide with published Census figures, only 22 record a higher median tax bill than Mercer County — it sits in the top 1% nationally. The county holds roughly 4.1% of New Jersey's people. Its homes are worth less than the state norm (median $351,000 versus $427,600), and a decade at the derived rate of 2.51% adds up to about 25.08% of the median home's value in tax. The cheapest county in the state, Cumberland County, medians $5,048 — $3,756 less than Mercer County per year.
Counties nearest Mercer County in the New Jersey ranking
| County | Median tax paid | Median home value | Derived rate* |
|---|---|---|---|
| Middlesex County, NJ | $9,684 | $439,300 | 2.20% |
| Hudson County, NJ | $9,413 | $508,600 | 1.85% |
| Sussex County, NJ | $8,462 | $342,800 | 2.47% |
| Warren County, NJ | $8,156 | $323,100 | 2.52% |
How the tax is worked out
Think of the final bill as three ingredients: the assessed value of the property, the exemptions subtracted from it, and the combined rate of every district the property sits in. Mercer County's medians imply a derived rate of 2.51%; applied illustratively, a $400,000 home would owe about $10,032 a year, or around $836 a month spread evenly. Individual properties depart from the illustration in both directions.
Checking your assessment in Mercer County
If your bill looks wrong, work through these steps:
1. Get your property record card from the assessor and check the basics — living area, lot size, bedrooms, condition, and any exemptions you should have.
2. Compare your assessed value with recent sale prices of similar homes in Mercer County.
3. Talk to the assessor's office informally first; clear errors are often fixed without a hearing.
4. If needed, file a formal appeal with the local review board before the deadline on your assessment notice, with your evidence attached.
5. Keep paying the bill as issued while the appeal runs, unless your notice says otherwise — unpaid taxes accrue penalties regardless of an appeal.
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Frequently asked questions
What is the median property tax in Mercer County, New Jersey?
The median real estate tax paid in Mercer County, New Jersey is $8,804 per year, on a median home value of $351,000 (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What is the effective property tax rate in Mercer County, New Jersey?
On a derived basis, 2.51%: the county's median tax bill of $8,804 divided by its median home value of $351,000. Because it is calculated from two survey medians, read it as a comparison estimate rather than an official rate.
How does Mercer County compare with the rest of New Jersey?
Mercer County ranks #11 of 21 New Jersey counties with published data by median taxes paid. Its median bill of $8,804 is about 8% lower than the New Jersey median of $9,541.
How are property taxes calculated in Mercer County, New Jersey?
Three steps produce the bill: an assessment of market value by the local assessor, a reduction for exemptions you qualify for (a homestead exemption is the common one), and multiplication by the combined rates of the county, municipality, school district and any special districts covering the property. The median result in Mercer County is $8,804 of tax on a $351,000 median home value.
Can I appeal my property tax assessment in Mercer County, New Jersey?
Yes. Request your property record card from the Mercer County assessor's office and check it for errors, then compare your assessed value with recent sales of similar homes. If it still looks too high, file a formal appeal with the local review board named on your assessment notice before the deadline printed on the notice — windows are short, often 30 to 90 days.