Warren County, NJ property tax
Census ACS 2023 5-year estimates · updated 2026-09-20
The median effective property tax rate in Warren County is 2.52%, above the New Jersey median of 2.23% and above the national median of 0.98%. The median homeowner pays $8,156 a year on a home worth $323,100.
- Effective rate
- 2.52%
- Median annual bill
- $8,156
- Median home value
- $323,100
- Rank in New Jersey
- 4of 21
Median annual bill divided by median home value, Census ACS 2023 5-year estimates.
Estimated annual bill by home value
| Home value | Estimated bill | Per month |
|---|---|---|
| $200,000 | $5,040 | $420 |
| $300,000 | $7,560 | $630 |
| $400,000 | $10,080 | $840 |
| $500,000 | $12,600 | $1,050 |
| $750,000 | $18,900 | $1,575 |
| $1,000,000 | $25,200 | $2,100 |
Property tax by town in Warren County, 2025
In 2025 the average residential tax bill in Warren County ran from $5,256 in Phillipsburg Town to $11,080 in Greenwich Township, across 22 municipalities. The average bill rose from 2024 in 18 of them.
| Municipality | Average bill 2025 | Average bill 2024 | General rate | Effective rate | Homes |
|---|---|---|---|---|---|
| Greenwich Township | $11,080 | $10,891 | 4.052 | 2.546 | 1,746 |
| Washington Township | $10,139 | $9,896 | 4.110 | 2.691 | 2,257 |
| Hackettstown Town | $9,665 | $9,484 | 3.477 | 2.686 | 2,365 |
| Hardwick Township | $9,403 | $8,922 | 3.825 | 2.221 | 447 |
| Franklin Township | $9,306 | $9,644 | 3.129 | 2.337 | 962 |
| Blairstown Township | $9,224 | $9,099 | 3.134 | 2.144 | 1,873 |
| Frelinghuysen Township | $9,029 | $8,954 | 2.858 | 2.202 | 625 |
| Knowlton Township | $8,889 | $8,268 | 4.271 | 2.324 | 946 |
| Independence Township | $8,766 | $8,470 | 3.795 | 2.437 | 1,898 |
| Mansfield Township | $8,551 | $8,403 | 3.563 | 2.483 | 1,965 |
| Hope Township | $8,536 | $8,431 | 3.466 | 2.195 | 649 |
| Washington Borough | $8,475 | $8,038 | 5.890 | 2.975 | 2,007 |
| Liberty Township | $8,356 | $7,770 | 3.656 | 2.260 | 1,025 |
| Oxford Township | $8,037 | $8,049 | 4.827 | 2.727 | 850 |
| Belvidere Town | $7,917 | $7,625 | 3.302 | 2.948 | 822 |
| Pohatcong Township | $7,814 | $7,497 | 4.535 | 2.997 | 1,245 |
| Allamuchy Township | $7,621 | $7,578 | 3.227 | 1.926 | 2,365 |
| Lopatcong Township | $7,141 | $6,992 | 3.042 | 2.410 | 3,022 |
| White Township | $6,752 | $6,448 | 2.620 | 1.809 | 1,548 |
| Alpha Borough | $6,403 | $6,696 | 3.485 | 2.396 | 804 |
| Harmony Township | $5,537 | $5,618 | 2.665 | 1.592 | 967 |
| Phillipsburg Town | $5,256 | $5,097 | 4.675 | 2.955 | 4,510 |
Property tax rates by city in Warren County
Among the 3 places listed, Washington borough has the highest median effective rate at 3.16% and Hackettstown town the lowest at 2.73%, against 2.52% for the county as a whole.
| Place | Effective rate | Median bill | Median home value | Population |
|---|---|---|---|---|
| Phillipsburg town | 2.80% | $5,053 | $180,700 | 15,251 |
| Hackettstown town | 2.73% | $9,205 | $337,100 | 10,143 |
| Washington borough | 3.16% | $8,226 | $260,200 | 7,287 |
Warren County compared with New Jersey and the US
| Area | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Warren County | 2.52% | $8,156 | $323,100 |
| New Jersey median | 2.23% | $9,541 | $427,600 |
| United States median | 0.98% | $2,969 | n/a |
Warren County compared with neighboring counties
Warren County borders 6 counties. Ranked from lowest to highest median effective rate, it places 7 of 7, the highest in its area.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Bucks County, PA | 1.38% | $5,833 | $421,700 |
| Northampton County, PA | 1.65% | $4,710 | $285,000 |
| Morris County | 1.80% | $10,000+ | $557,000 |
| Monroe County, PA | 1.84% | $4,435 | $241,200 |
| Hunterdon County | 2.01% | $10,000+ | $498,800 |
| Sussex County | 2.47% | $8,462 | $342,800 |
| Warren County | 2.52% | $8,156 | $323,100 |
New Jersey statewide: New Jersey has no general homestead exemption. Homeowner relief comes from three state programs claimed on one combined application: ANCHOR for homeowners and renters, Senior Freeze, which reimburses eligible seniors and disabled persons for property tax increases on their main home, and Stay NJ for senior homeowners. NJ property tax relief: ANCHOR, Senior Freeze and Stay NJ amounts.
Due dates and payment
New Jersey statewide: paid in four installments due February 1, May 1, August 1 and November 1. Confirm the local schedule with the Warren County tax office.
Appealing your assessment
File with the County Board of Taxation by April 1, or by May 1 in a town that completed a revaluation or reassessment. Burlington, Gloucester and Monmouth counties use a January 15 deadline. Assessments over $1,000,000 may be appealed directly to the Tax Court of New Jersey, and a county board judgment can be taken to the Tax Court within 45 days. Bring recent sales of comparable homes, photos of condition issues, and any error in the record such as square footage or lot size. How to appeal, step by step.
How New Jersey assesses value
New Jersey taxes real property on its true value, the price it would sell for at a fair and bona fide sale, set as of October 1 of the year before the tax year. Full New Jersey rules, exemptions and deadlines.
Rates and medians: U.S. Census Bureau, ACS 2023 5-year estimates, tables B25103 and B25077. Effective rate is median taxes paid divided by median owner-occupied home value. Places: Census place by county reference file. New Jersey towns: NJ Division of Taxation, Statistical Information, 2024 and 2025. Neighbors: Census county adjacency file. Rules: New Jersey Division of Taxation, Assessment and Appeals. NJ Division of Taxation, How Property is Valued for Tax Purposes. NJ Division of Taxation, Property Tax Relief Programs. NJ Division of Taxation, Deductions, Exemptions and Abatements. NJ Division of Local Government Services, Elements of Tax Sales. NJ Property Taxpayer Bill of Rights.
Frequently asked questions
What is the property tax rate in Warren County, NJ?
The median effective property tax rate in Warren County is 2.52% of home value, above the New Jersey median of 2.23% and above the national median of 0.98%. The median homeowner pays $8,156 a year on a median home value of $323,100 (Census ACS 2023 5-year).
How much is property tax on a $400,000 house in Warren County?
About $10,080 per year at the county's median effective rate of 2.52%, before exemptions. The exact bill depends on the city, school district and special districts that serve the parcel, so treat this as a planning estimate.
When are property taxes due in Warren County?
New Jersey statewide: paid in four installments due February 1, May 1, August 1 and November 1. Check the Warren County tax office for the exact local dates.
How do I appeal a property tax assessment in Warren County?
File with the County Board of Taxation by April 1, or by May 1 in a town that completed a revaluation or reassessment. Burlington, Gloucester and Monmouth counties use a January 15 deadline. Assessments over $1,000,000 may be appealed directly to the Tax Court of New Jersey, and a county board judgment can be taken to the Tax Court within 45 days. Full New Jersey rules are on the New Jersey page.
How does Warren County compare with the rest of New Jersey?
Warren County ranks 4 of 21 New Jersey counties by effective rate. The New Jersey median is 2.23% and the median bill is $9,541.