Middlesex County and Marlborough City property record for 18 Commonwealth Ave, Marlborough, MA 01752
| Property Type | Duplex |
|---|---|
| Details | 4 bd · 2 ba · 2,069 sqft · built 1889 |
| Lot Size | 0.14 acres (6,095 sqft) |
| Owner | Individual Name on File |
| Last Sale | $242,500 (Jan 2013) |
| Tax Bill | $5,192 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 18035 |
| Primary APN | 18035 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 10 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 2,069 sqft Living Area |
| Gross Area | 3,942 sqft |
| Basement Area | 1,003 sqft |
| Unfinished Basement | 1,003 sqft |
| Year Built | Built 1889 |
|---|---|
| Effective Year Built | Effective 1889 |
| Architectural Style | Duplex Single |
| Exterior Material | Aluminum/Vinyl |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 6,095 sqft (0.14 acres) |
| Heating System | Forced Air with A/C |
|---|---|
| Heating Fuel | Gas |
| Account Number | 18035 |
|---|---|
| Street Address | 18 COMMONWEALTH AVE |
| City | MARLBOROUGH |
| State | MA |
| Zip | 01752-3213 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | RB |
| Legal Block | 240 |
| Jurisdiction | MARLBOROUGH MA |
| Township / Civil Division | MARLBOROUGH |
| Census Block Group | 2 |
| Census Block | 2004 |
| Census Tract | 321200 |
18 Commonwealth Ave, a duplex, is owned by an individual who bought it in January 2013.
Source: Middlesex County and Marlborough City records, as of October 20, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 183 W MAIN ST, NORTHBOROUGH, MA 01532-1801 |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jan 31, 2013 · Amount on File |
| Deed Sale | Jan 31, 2013 · Amount on File |
| Deed Document Number | 20132 |
| Deed Book / Page | 61101 / 19 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 18 Commonwealth Ave was $5,192, up 5.9% from the year before.
Source: Middlesex County and Marlborough City assessment roll, as of April 14, 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Municipality | Marlborough City |
| Unified School District | Marlborough School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $5,192.00 (+5.92%) | $526,600 (+10.01%) Land $207,300 Building $319,300 | $615,228 |
| 2024 | $4,902.00 (+0.66%) | $478,700 (+13.44%) Land $188,500 Building $290,200 | |
| 2023 | $4,870.00 | $422,000 Land $149,000 Building $273,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 18 Commonwealth Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 10, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 2 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 18 Commonwealth Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 95% of the US · lower than 90% of Massachusetts |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | MARLBOROUGH DPW WATER DIV. (MWRA) serves 41,799 people · EPA ID MA2170000 |
|---|---|
| Water Source | Purchased surface water from MWRA |
| Last State Inspection | Aug 2024 |
| Lead | 1 ppb (2026) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 374 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Xfinity Cable | 2,000 / 2,000 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: T-Mobile.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures