Williamstown, NJ Real Estate and Homes for Sale
How much do homes cost in Williamstown, NJ?
Over the past 12 months, 451 homes sold in Williamstown at a median price of $365,000, and most sold between $300,000 and $462,000. The typical home went under contract in 27 days (Bright MLS, November 2025 through October 2026).
Schools
Williamstown is part of Monroe Township, so schools follow the township.
Public school students in Williamstown attend the Monroe Township Public Schools (pre-K through 12th grade).
Test scores, enrollment, class sizes and programs for each district are in the state’s School Performance Reports (NJ Department of Education, 2023-24):
Property taxes
Williamstown is part of Monroe Township, which sets property taxes there. In 2025, the average residential property tax bill in Monroe Township was $7,874, below the Gloucester County average of $7,889.
Monroe Township assesses homes at about 66% of market value, so its 3.769% tax rate works out to an effective rate of 2.473% of what a home is worth. At that rate, a home selling at the local median price of $365,000 would pay roughly $9,030 a year, about $752 a month. The actual bill depends on the home’s assessed value.
| Municipality | Average tax bill | Tax rate | Assessed at | Effective rate |
|---|---|---|---|---|
| Monroe Township | $7,874 | 3.769% | 66% | 2.473% |
| Winslow | $6,562 | 3.695% | 62% | 2.293% |
| Clayton | $7,028 | 2.569% | 101% | 2.586% |
| Washington Township | $8,543 | 3.665% | 66% | 2.412% |
| Gloucester County average | $7,889 |
2025 figures. “Assessed at” is the share of market value used for assessments (effective rate divided by tax rate). Source: NJ Division of Taxation, 2025 Average Residential Statistics and 2025 General and Effective Tax Rates.
The real estate market right now
12-month snapshot (Bright MLS, Williamstown mailing address, closed sales November 2025 through October 2026):
- Median sale price: $365,000 (451 closed sales)
- Year over year: up about 1.4% from a $360,000 median the prior 12 months
- Typical range: most homes sold between $300,000 and $462,000
- Median price per square foot: $225
- Median days on market: 27 days
- Sale-to-list ratio: 99.7%
- Sold over asking: 39% of sales
For county-level trends, see our Gloucester County real estate market report, updated monthly.
Williamstown, NJ Homes For Sale Right Now
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