Mercer County NJ property tax rates by town (2025)
Each town sets its own general rate. The bars below are one named municipality’s school / county / municipal split of that rate — not a single county-wide bill. State school aid is outside this bar; it reduces the school levy before the rate is struck. How NJ taxes work.
Mercer County at a glance
13 municipalities and 123,017 parcels are on the 2026 file. 0 of those towns have a 2026 general rate loaded. On a $500,000 sale in 2025, the estimated tax runs from $10,408 in West Windsor Twp to $17,708 in Trenton City. The middle bill is $12,107 in Pennington Boro. Class 2 residential assessments moved from $25,081,558,900 to $25,340,778,600, up 1.0%. The median class 2 house was built in 1960.
Median school-share town (rate year 2025): Hopewell Boro
Among 11 municipalities on the 2025 rate sheet. Bars are Hopewell Boro’s own components — not three separate county medians.
Schools
54.8%
County
21.5%
Municipal
23.7%
School-share range in 2025: Trenton City 20.4% → East Windsor Twp 61.8%.
How to read Mercer County
On the 2025 rate sheet, the middle municipality by school share is Hopewell Boro: 54.8% schools, 21.5% county, 23.7% municipal. School share on that same sheet runs from Trenton City at 20.4% to East Windsor Twp at 61.8%.
Class 2 residential net assessments in this county changed from $25,081,558,900 to $25,340,778,600, up 1.0%, on 101,864 parcels with both a prior net and a 2026 net. That is the assessment roll for this county. It is not a list of which towns rose the most, and it is not an appraisal.
Estimated class 2 tax on the towns with both a prior rate and a current rate moved from $878,160,832 to $916,145,036, up 4.3%. Each of those 11 towns uses its own two rate years. The prior rate is as early as 2024 and the current rate is as late as 2025. This is not one calendar-year county levy. When a town reassesses, the assessment percent and this bill percent are different stories, because the rate falls as the assessments reset.
The largest class share of net assessed value in the 2026 file is Residential at 55.4%.
These are this county’s own figures. The general rate is not comparable across towns until each town’s assessment ratio is applied. The sale-price section states the tax on the same $200,000 sale and the same $500,000 sale after that ratio. Towns stay in legal-name order. State school aid is outside the rate bars.
Tax on a $200,000 or $500,000 sale, 2025
A sale price is not the assessment. In Mercer County for 2025, each town’s average ratio turns that price into an assessment, and that town’s general rate is applied to the assessment. On a $500,000 sale, the bill is $10,408 in West Windsor Twp (ratio 65.83%, rate 3.162) and $17,708 in Trenton City (ratio 60.13%, rate 5.890). The middle bill is $12,107 in Pennington Boro. A $200,000 sale uses the same ratio and rate in that town. This is an Abstract of Ratables estimate, not a collector bill, and the ratio is the town average, not an appraisal of one house.
The highest residential estimate in Mercer County is $132,904 at 189 WOOSAMONSA RD, Hopewell Twp, on a net assessment of $4,247,500 and a 2025 general rate of 3.129.
The highest business estimate in Mercer County is $11,498,847 at 3551 LAWR-PRIN ROAD, Lawrence Twp, on a net assessment of $363,312,700 and a 2025 general rate of 3.165.
1125 BEAR TAVERN RD in Hopewell Twp is assessed at $90,416,000, higher than 301 SULLIVAN WAY in Ewing Twp at $70,550,200. The estimated tax is still lower, $2,829,117 versus $2,857,989, because the general rates are 3.129 and 4.051.
Owner names are not shown. Each town’s own rate is used, so a higher assessment in a low-rate town can still be a lower tax. Commercial and industrial parcels (class 4A and 4B) are the business list. Apartment buildings are class 4C and are not in that list. This is not a collector’s bill.
Mercer County this year
13 municipalities sit on the 2026 assessment file. Loaded rates here are 2025 against the 2026 assessment file.
Trenton City is the municipal-heavy capital-city contrast: general rate 5.890 on the loaded sheet, with about 20% schools / 16% county / 64% municipal of the three-bucket sum — not the “schools dominate every NJ bill” pattern. East Windsor Twp sits near the top of the school-share range (~62% schools). Hamilton Twp is a large suburban middle (~41% schools / 22% county / 37% municipal, rate 3.708).
The median school-share municipality on the 2025 sheet is named above. Princeton’s two municipal records may still show incomplete parcel or rate coverage in the warehouse — trust the table badges and empty states over a single headline number.
Sources: NJ Division of Taxation MOD-IV and Abstract of Ratables. Estimates are not collector bills. Disclaimer.
Housing stock in Mercer County, median year built 1960
On the 2026 file, class 2 houses in Mercer County with a year built have a median year of 1960, about 66 years old. Of those 101,061 houses, the largest share was built Before 1940. This is the assessor’s year built. It is not a ranking of towns.
By parcel count, Residential 82.8%, Vacant land 10.7%, Commercial 4.5%, Farm (qualified) 0.8%, Farm (regular) 0.4%, Apartment 0.3%, Industrial 0.3%, Other / unclassified 0.1%. Those percentages are a count of parcels, not a share of tax dollars. The class table uses the tax-base share.
Year built
Before 1940
28.5%
1940–1959
18.8%
1960–1979
19.2%
1980–1999
21.8%
2000–2009
8.4%
2010–2026
3.3%
Assessor building line
Grouped from the assessor’s building abbreviation. One-family, two-family, and condo are the codes that read clearly. Other codes stay in their own group. This is not a bedroom count, and square feet are left off because most records do not include them.
One-family
58,270 62.6%
Two-family
87 <0.1%
Three-family or more
17 <0.1%
Condo
2,482 2.7%
Other codes
32,294 34.7%
Ratable base by property class
Share of net assessed value in the MOD-IV parcel file (not the Abstract value columns). Class 15 exempt parcels may be under-counted when net value is zero. This is the tax base mix, not a school rating.
Class
Parcels
Net assessed
% of net
Residential 2
101,885
$25,342,988,900
55.4%
Vacant land 1
13,195
$9,858,587,900
21.5%
Commercial 4A
5,528
$6,824,571,000
14.9%
Industrial 4B
312
$1,670,165,812
3.6%
Apartment 4C
420
$1,710,467,600
3.7%
Farm (regular) 3A
551
$337,600,900
0.7%
Farm (qualified) 3B
969
$10,447,900
0.0%
Other / unclassified other
157
$9,962,963
0.0%
Municipalities
Default order is legal name. The general rate is not comparable across towns with different equalized ratios and is not a ranking of tax burden. Percents are shares of school + county + municipal cents on the rate sheet.