| City: | Rochester, New Hampshire |
| County: | Strafford County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 7:59:01 PM |
| Population: | No Population Data |
| Area Code: | 603 |
| Classification: | PO Box |
| Coordinates: | 43.2756, -70.9891 |
| Quick Link: |
Rochester, New Hampshire uses ZIP code 03866 for PO Box mail at its downtown post office location. This isn't a standalone community but rather a dedicated PO Box ZIP within the larger Rochester area. The primary ZIP code 03867 handles street delivery for the city, while 03866 exists specifically for the 370 PO Boxes at this location.
The post office sits on Allen Street and serves both residents and businesses who prefer PO Box mail. With 147 business delivery points and 4 local establishments employing 45 people, there's a small commercial presence tied to this ZIP. The Allen Street address includes multiple unit designators, indicating a multi-tenant commercial building where the post office operates.
For anyone mailing to Rochester, NH, the choice between 03866 and 03867 depends on the delivery type. Use 03866 only for PO Box addresses. Street addresses should use 03867, which provides actual carrier delivery throughout the city.
All delivery points are on Allen Street, the location of the downtown post office facility.
ZIP Code 03866 supports both business and residential activity. According to the Business Census (2024), there are 4 business establishments, employing about 38 people with an annual payroll of $2,844,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 1,128Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 4Source: CBP |
| 1st Quarter Payroll: | $438,000Source: CBP |
| Annual Payroll: | $2,844,000Source: CBP |
| # of Employees: | 38Source: CBP |
ZIP Code 03866 is located in Strafford County, New Hampshire, within the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area (CBSA 14460) and New Hampshire's 1st Congressional District. This Metro area has a population of 4,552,402 people, about 0.00% of whom live in ZIP Code 03866, and is subdivided into the Rockingham County-Strafford County, NH 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: | Rockingham County-Strafford County, NH (CBSA Div 40484)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: | 01Source: USPS |
| Congressional Land Area: | 2463.65 sq miSource: Census |
| PMSA: | Portsmouth-Rochester, NH-ME PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 3365140Source: Census |
| Place Name: | Rochester city; New HampshireSource: Census |
We could not locate which school district 03866 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.