registered sex offenders live in Cambridge — that's 1 in every 3,289 residents, or 3 per 10,000, 65% below the Massachusetts state average.
The count has increased by 4 since July 2026.
Cambridge has 3 registered sex offenders per 10,000 residents — 65% below the Massachusetts state average of 8.5, and below the national average of about 24. Per-capita rates are the fair way to compare cities of different sizes.
Against Massachusetts cities of similar size, Cambridge has the lowest rate per resident:
| # | City | Population | Registered offenders | Per 10,000 residents |
|---|---|---|---|---|
| 1 | Lynn | 101,253 | 186 | 18.4 |
| 2 | Brockton | 105,643 | 180 | 17.0 |
| 3 | Lowell | 115,554 | 143 | 12.4 |
| 4 | Quincy | 101,636 | 40 | 3.9 |
| 5 | Cambridge | 118,403 | 36 | 3.0 |
Where Cambridge's 36 registered offenders live, by the ZIP code on their registry record. Cambridge (02139) tops the list with 20 — 56% of the citywide total.
| # | Area | ZIP code | Registered offenders | Share of city |
|---|---|---|---|---|
| 1 | Cambridge | 02139 | 55.6% | |
| 2 | Cambridge | 02141 | 16.7% | |
| 3 | Cambridge | 02138 | 11.1% | |
| 4 | Cambridge | 02140 | 8.3% | |
| 5 | Cambridge | 02142 | 5.6% |
Counts as of August 2026, compiled from official registry records. Area names reflect the town or neighborhood most commonly listed on registry records for that ZIP.
Massachusetts classifies registrants by assessed re-offense risk — Level 1 (low, never public), Level 2 (moderate), and Level 3 (high, always public with active police notification).
Citywide numbers can't tell you who lives on your street. The free Predator Map app searches any Cambridge address and shows every registered offender around it on an interactive map — photos, offenses, and registered addresses from official registry records. You can also search the official Massachusetts Sex Offender Registry Board (SORB) directly.
As of August 2026, there are 36 registered sex offenders in Cambridge, Massachusetts — about 3 for every 10,000 residents, 65% below the Massachusetts state average. Cambridge ranks #17 of the 25 largest Massachusetts cities by offender count.
Cambridge, ZIP code 02139, has the most registered sex offenders in Cambridge with 20 — 56% of the city's total.
Use the free Predator Map app: search any Cambridge address and every registered offender nearby appears on an interactive map with photos, offense details, and registered addresses from official registry records.
Yes. Predator Map Pro monitors up to 5 addresses daily and sends push and email alerts when a registered offender moves in nearby, a new offender registers, or someone moves away.
Free search for any Cambridge address — and daily monitoring with instant alerts when something changes.
Search your address freeWant alerts the moment a predator moves in nearby? Get the free app.
Methodology: Statistics are compiled from aggregated official state registry records and refreshed monthly. City figures count the city listed on each registry record. Per-capita rates use 2020 U.S. Census populations. Aggregated counts can exceed what public registry websites display because some classification levels are excluded from public searches. Figures are estimates and change daily as registries update — always verify individual records with the official state registry.