Middlesex County · Massachusetts
ZIP code 01851
- Population
- 32,308
- Median income
- $87,962
- Median home
- $432,100
- Sales tax
- 6.25%
ZCTA residents
Household, past 12 months
Owner-occupied value
Massachusetts state rate
Quick answer
ZIP 01851 sits in Middlesex County, Massachusetts and is home to 32,308 people. Median household income is $87,962, the median home is worth $432,100 and median gross rent is $1,686. 44.7% of households own their home, and purchases are taxed at 6.25% (Massachusetts state rate).
- County
- Middlesex County
- State
- Massachusetts (MA)
- Area codes
- Not published
- Metro area
- Outside covered metros
FIPS 25017
539 ZIPs covered
No NANPA match for this ZIP
Rate jurisdiction used for tax
The numbers for 01851
American Community Survey 2019-2023 ACS 5-year estimates for this ZCTA.
- Population
- 32,308ZIP 01851 residents
- Median household income
- $87,962Past 12 months, inflation adjusted
- Median home value
- $432,100Owner-occupied units
- Median gross rent
- $1,686Rent plus utilities, monthly
- Median age
- 35.6 yrsAll residents
- Homeownership rate
- 44.7%Owner-occupied households
Sales tax in 01851
What a purchase inside this ZIP costs at checkout.
Massachusetts levies 6.25% statewide with no local add-ons. Check the county page for the local component before you quote a price.
Affordability in this ZIP
Derived from the Census medians above — indicative, not an offer.
A rent burden above 30% is the federal threshold for cost-burdened households, and a price-to-income multiple above 4× is generally considered a stretched housing market. The mortgage figure is principal and interest only — taxes, insurance and HOA dues are extra.
How 01851 compares
ZIP 01851 against the median ZIP in Middlesex County and across Massachusetts.
| Measure | ZIP 01851 | County median | State median | vs state |
|---|---|---|---|---|
| Median household income | $87,962 | $136,382 | $107,198 | -18% |
| Median home value | $432,100 | $699,300 | $481,450 | -10% |
| Median gross rent | $1,686 | $2,082 | $1,591 | +6% |
| Population | 32,308 | 18,153 | 8,755 | +269% |
Medians are computed across the 81 ZIP areas in Middlesex County and the 539 ZIP areas in Massachusetts.
Statewide rank
Where this ZIP places among all 539 Massachusetts ZIP areas.
- Income
- #362
- Home value
- #315
- Population
- #46
richer than 29% of 507 state ZIPs
above 38% of 512 state ZIPs
larger than 91% of 539 state ZIPs
Comparable ZIP codes
Massachusetts ZIP areas with almost the same household income.
Nearby ZIP codes
Other ZIP codes filed under Middlesex County.
ZIP 01851 questions
Common questions about this ZIP code.
- Where is ZIP code 01851?
- ZIP 01851 lies mostly in Middlesex County, Massachusetts. County assignment follows the largest share of land area, so a ZIP straddling a county line is filed under its dominant county.
- What sales tax do I pay in 01851?
- Massachusetts charges 6.25% statewide.
- Is 01851 expensive to live in?
- Median rent runs $1,686 a month, about 23% of median household income, and the median home is worth $432,100 — -10% against the typical Massachusetts ZIP.
- Is a ZCTA the same as a postal ZIP code?
- Not exactly. The Census builds ZIP Code Tabulation Areas from the ZIP codes of addresses inside each census block, so a ZCTA can differ slightly from the USPS delivery route of the same number, and PO-box-only ZIPs have no ZCTA at all.
Keep going
Related pages for this area.
Sources & transparency
- US Census Bureau, ACS 2019-2023 5-year estimates — 2019-2023 ACS 5-year — population, income, housing
- Census 2020 ZCTA-to-county relationship file — County assignment by largest land-area overlap
- Massachusetts Department of Revenue — Sales tax rates and local add-ons
Last reviewed December 2024. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.