Mercer County, NJ Property Tax Rate
Homeowners in Mercer County pay an effective 2.51% of home value in property tax — about $8,810 a year on the median $351,000 home, above the New Jersey county median of 2.20%.
Mercer County, NJ: 2.51% effective property tax — ~$8,810/yr on the median home.
- Effective rate2.51%
- Median home value$351,000
- Median annual bill$8,810
- NJ county median2.20%
- U.S. county median0.84%
Source: U.S. Census ACS 2023 5-year (median taxes paid ÷ median value), compiled June 2026.
Mercer County vs. New Jersey and the U.S.
| Effective rate | On the county's $351,000 median home | |
|---|---|---|
| Mercer County | 2.51% | $8,810 |
| New Jersey county median | 2.20% | $7,722 |
| U.S. county median | 0.84% | $2,948 |
Median household income here is $96,333, putting the median tax bill at about 9.1% of income. Effective rates fold in homestead exemptions and assessment practice — they're what owners actually pay, which is why they beat statutory rates for comparison.
Highest & lowest rates in New Jersey
| County | Effective rate | Median bill |
|---|---|---|
| Camden County | 3.08% | $8,076 |
| Salem County | 3.03% | $6,757 |
| Gloucester County | 2.81% | $7,966 |
| Warren County | 2.52% | $8,142 |
| Cape May County | 1.32% | $5,214 |
| Bergen County | 1.69% | $10,025 |
| Ocean County | 1.77% | $6,489 |
| Monmouth County | 1.77% | $10,027 |
Full picture: New Jersey property tax calculator · interactive county atlas · all county pages.
Frequently asked questions
What is the property tax rate in Mercer County, NJ?
The effective rate is about 2.51% of home value — the median homeowner pays roughly $8,810 a year on a $351,000 median home (ACS 2023 five-year data).
Is Mercer County's property tax high?
It's above the New Jersey county median (2.20%) and above the U.S. county median (0.84%).
How is the effective rate calculated?
Median real-estate taxes paid ÷ median home value, from the Census American Community Survey — what owners actually pay, after exemptions, rather than the statutory millage.
Sources & methodology
Sources: Census ACS 2023 5-year tables B25103/B25077.
Effective rate = median real-estate taxes ÷ median home value (owner-occupied). Individual bills vary with exemptions, assessment timing and local levies — verify with the county assessor.