Property tax · ZIP 02139
Property tax in Cambridge, MA
ZIP 02139 (Massachusetts) — property tax summary sourced from County assessors. Refreshed on the cadence of the primary regulator with every claim cited to the source record.
What lands here
Pages show the county millage rate, assessment methodology, homestead and senior exemptions, and a link to the assessor's portal for address-specific searches.
Source & refresh
County assessors. Refreshed annual reassessment per county. Stale data is flagged, never silently served. Primary source →
Limitations specific to this source
Top-50 metros covered at launch (~35% of US population). Smaller counties deep-link to the assessor portal with a pending-ingestion flag pending federation.
Massachusetts context
Lead pipes, coastal flood, older housing
Massachusetts has dense lead-service-line obligations under LCRR in Boston, Lowell, Worcester, Springfield. Coastal AE/VE zones along the South Shore + Cape. Older housing stock means lead-paint risk overlaps with LSL risk.
See Massachusetts state page for the full state-level rollup across all 12 dimensions.
Read more on property tax
Editorial deep-dives explaining the source data, its limits, and how to read it.
Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate
The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.
Property tax millage — what 'mill' means and how your bill is computed
Plain-English guide to property tax millage rates, assessment ratios, and homestead exemptions. How county assessors compute your annual property tax bill.
School district boundaries — how to confirm yours and why it matters
How school district boundaries work, where to find them, and why the same street can split between two districts.
Deed records — what they show and what they don't
Plain-English guide to county deed records: what gets filed, how to look up a property's history, and why zipradar aggregates only counts (never owner names).
Full dashboard for ZIP 02139
Property tax is one of twelve dimensions zipradar federates per address. See the full federated summary for ZIP 02139:
Open Cambridge, MA dashboard →Frequently asked questions
What is the property tax for ZIP 02139?
Property tax for ZIP 02139 (Cambridge, Massachusetts) is federated from County assessors. Pages show the county millage rate, assessment methodology, homestead and senior exemptions, and a link to the assessor's portal for address-specific searches. Refreshed annual reassessment per county — see /methodology for full source citations and refresh-cadence details.
Where does the property tax data come from?
County assessors (primary regulator). zipradar federates property tax on the regulator's published cadence: annual reassessment per county. Every claim cites the source record; stale data is flagged, never silently served. The primary source URL: https://zipradar.org/methodology/.
What are the limitations of property tax data?
Top-50 metros covered at launch (~35% of US population). Smaller counties deep-link to the assessor portal with a pending-ingestion flag pending federation.
Is ZIP 02139 (Cambridge) data current?
Last verified 2026-06-03. Property tax for ZIP 02139 refreshes annual reassessment per county per County assessors cadence. See the full ZIP dashboard at /zip/02139/ for all 12 dimensions side-by-side.