| City: | Dover, New Hampshire |
| County: | Strafford County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 7:58:30 PM |
| Population: | No Population Data |
| Area Code: | 603 |
| Classification: | PO Box |
| Coordinates: | 43.1921, -70.8804 |
| Quick Link: |
ZIP 03821 serves downtown Dover, providing PO Box service for the city's business district. The facility maintains 390 PO Boxes, with 315 business accounts concentrated along Washington Street. This isn't a residential ZIP—Dover residents receive home delivery through the neighboring 03820 ZIP code.
The post office handles mail for a single carrier route covering Washington Street, where most boxes serve businesses rather than households. Dover's commercial core relies on this centralized PO Box service, allowing companies to maintain stable addresses even as storefronts change hands. The high business-to-box ratio shows this facility's role in supporting Dover's downtown economy rather than serving residential neighborhoods.
Washington Street dominates this ZIP as the sole delivery route, reflecting Dover's traditional downtown layout where a single main street serves as the commercial hub.
ZIP Code 03821 supports both business and residential activity. According to the Business Census (2024), there are 19 business establishments, employing about 151 people with an annual payroll of $8,066,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 2,366Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 19Source: CBP |
| 1st Quarter Payroll: | $1,792,000Source: CBP |
| Annual Payroll: | $8,066,000Source: CBP |
| # of Employees: | 151Source: CBP |
ZIP Code 03821 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 03821, 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: | 3318820Source: Census |
| Place Name: | Dover city; New HampshireSource: Census |
We could not locate which school district 03821 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.