Middlesex 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.
Middlesex County at a glance
24 municipalities and 230,421 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 $4,625 in Carteret Boro to $13,615 in Highland Park Boro. The middle bill is $10,575 in New Brunswick City. Class 2 residential assessments moved from $47,782,877,382 to $48,809,513,131, up 2.1%. The median class 2 house was built in 1967.
Median school-share town (rate year 2025): South Plainfield Boro
Among 24 municipalities on the 2025 rate sheet. Bars are South Plainfield Boro’s own components — not three separate county medians.
Schools
54.6%
County
17.1%
Municipal
28.3%
School-share range in 2025: Perth Amboy City 25.2% → Plainsboro Twp 65.9%.
How to read Middlesex County
On the 2025 rate sheet, the middle municipality by school share is South Plainfield Boro: 54.6% schools, 17.1% county, 28.3% municipal. School share on that same sheet runs from Perth Amboy City at 25.2% to Plainsboro Twp at 65.9%.
Class 2 residential net assessments in this county changed from $47,782,877,382 to $48,809,513,131, up 2.1%, on 199,758 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 $1,994,978,290 to $2,014,467,745, up 1.0%. Each of those 24 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 53.1%.
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 Middlesex 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 $4,625 in Carteret Boro (ratio 58.99%, rate 1.568) and $13,615 in Highland Park Boro (ratio 100.00%, rate 2.723). The middle bill is $10,575 in New Brunswick City. 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.
Highest estimated tax in Middlesex County: $97,325
Residential
The highest residential estimate in Middlesex County is $97,325 at 1667 WOODLAND AVE, Edison Twp, on a net assessment of $1,700,000 and a 2025 general rate of 5.725.
GRIGGS DRIVE in South Brunswick Twp is assessed at $1,422,500, higher than 124 CHELSEA LN in Woodbridge Twp at $700,200. The estimated tax is still lower, $79,347 versus $84,262, because the general rates are 5.578 and 12.034.
The highest business estimate in Middlesex County is $8,533,653 at ONE SQUIBB DRIVE, North Brunswick Twp, on a net assessment of $129,868,400 and a 2025 general rate of 6.571.
1115 CENTENNIAL AVE in Piscataway Twp is assessed at $478,800,000, higher than ONE SQUIBB DRIVE in North Brunswick Twp at $129,868,400. The estimated tax is still lower, $8,379,000 versus $8,533,653, because the general rates are 1.750 and 6.571.
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.
Middlesex County this year
24 municipalities sit on the 2026 assessment file. Loaded rates are 2025.
New Brunswick City is the municipal-leaning city contrast (~40% schools / 16% county / 44% municipal, rate 2.688). Perth Amboy City is more municipal-heavy still (~25% schools / 15% county / 60% municipal). Edison Twp sits near the county median school share (~55% schools) on the loaded sheet.
School-share extremes run from Perth Amboy to Plainsboro Twp (~66% schools). Full legal names matter here — East Brunswick, South Brunswick, North Brunswick, and the South* towns are easy to confuse in a truncated list. Use the table.
Sources: NJ Division of Taxation MOD-IV and Abstract of Ratables. Estimates are not collector bills. Disclaimer.
Housing stock in Middlesex County, median year built 1967
On the 2026 file, class 2 houses in Middlesex County with a year built have a median year of 1967, about 59 years old. Of those 187,881 houses, the largest share was built 1940–1959. This is the assessor’s year built. It is not a ranking of towns.
By parcel count, Residential 86.7%, Vacant land 8.1%, Commercial 3.3%, Industrial 0.9%, Apartment 0.4%, Farm (qualified) 0.3%, Other / unclassified 0.2%, Farm (regular) 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
15.7%
1940–1959
25.3%
1960–1979
20.3%
1980–1999
25.1%
2000–2009
7.8%
2010–2026
5.9%
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
69,860 41.5%
Two-family
2,178 1.3%
Three-family or more
333 0.2%
Condo
6,299 3.7%
Other codes
89,801 53.3%
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
199,783
$48,812,520,131
53.1%
Vacant land 1
18,597
$18,088,671,172
19.7%
Commercial 4A
7,710
$8,032,324,836
8.7%
Industrial 4B
2,116
$12,006,714,637
13.1%
Apartment 4C
923
$4,906,020,656
5.3%
Farm (regular) 3A
276
$116,757,800
0.1%
Farm (qualified) 3B
663
$7,468,900
0.0%
Other / unclassified other
353
$18,378,559
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.