| Official Zip Code Name | Chelmsford |
| Zip Code State | Massachusetts |
| Primary County: | Middlesex |
| Area Code | 978/781 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 5 |
| Elevation Range | 137 ft. |
| Area | 18.062 Sqm. |
| Coordinates(Y,X) | 42.587771, -71.351760 |