| City: | Cambridge, Massachusetts |
| City Alias: | Harvard Sq, Harvard Square |
| County: | Middlesex County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 7:51:35 PM |
| Population: | No Population Data |
| Area Codes: | 339 / 508 / 617 / 781 / 857 / 978 |
| Classification: | PO Box |
| Coordinates: | 42.3669, -71.1002 |
| Quick Link: |
This isn't a residential ZIP code in the traditional sense. Street delivery for the surrounding neighborhood comes through the main Cambridge ZIP code 02138, which fully encloses this facility. The 229 businesses that use 02238 boxes include shops, offices, and services clustered around Harvard Square. Mount Auburn Street handles all 123 street-type mail records associated with this ZIP, though residents in the area receive home delivery through their standard Cambridge address.
Only Mount Auburn Street appears in mail records, reflecting this ZIP's role as a single-facility PO Box operation rather than a geographic delivery zone.
ZIP Code 02238 supports both business and residential activity. According to the Business Census (2024), there are 17 business establishments, employing about 2,153 people with an annual payroll of $146,384,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 557Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 17Source: CBP |
| 1st Quarter Payroll: | $37,447,000Source: CBP |
| Annual Payroll: | $146,384,000Source: CBP |
| # of Employees: | 2,153Source: CBP |
ZIP Code 02238 is located in Middlesex County, Massachusetts, within the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area (CBSA 14460) and Massachusetts's 5th Congressional District. This Metro area has a population of 4,552,402 people, about 0.00% of whom live in ZIP Code 02238, and is subdivided into the Cambridge-Newton-Framingham, MA division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Boston-Cambridge-Newton, MA-NHSource: Census |
| CBSA Number: | 14460Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Cambridge-Newton-Framingham, MA (CBSA Div 15764)Source: Census |
| CBSA Population: | 4,552,402Source: Census |
| MSA: | Boston-Worcester-Lawrence, MA-NH-ME-CT CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 05Source: USPS |
| Congressional Land Area: | 265.08 sq miSource: Census |
| PMSA: | Boston, MA-NH PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 2511000Source: Census |
| Place Name: | Cambridge city; MassachusettsSource: Census |
We could not locate which school district 02238 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.