| City: | Haverhill, Massachusetts |
| County: | Essex County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 8:23:39 PM |
| Population: | No Population Data |
| Area Codes: | 351 / 978 |
| Classification: | PO Box |
| Coordinates: | 42.7763, -71.0778 |
| Quick Link: |
ZIP code 01831 serves as Haverhill's dedicated PO Box facility, handling mail for 341 box holders and 146 businesses at Washington Square. This isn't a residential delivery zone. Street addresses in downtown Haverhill use the neighboring 01830 ZIP code for carrier delivery.
The facility exclusively manages PO Box operations for the city's commercial district and residents who prefer centralized mail pickup. All 422 ZIP+4 records point to either PO Boxes (218 records) or the single street location at Washington Square (204 records) where the post office building stands. Haverhill residents have standard carrier delivery available through other local ZIP codes, making this a service choice rather than a requirement.
The single street record for Washington Square represents the post office building itself, not a residential delivery area. This is a PO Box-only facility serving downtown Haverhill's commercial and residential mail needs.
ZIP Code 01831 supports both business and residential activity. According to the Business Census (2024), there are 6 business establishments, employing about 148 people with an annual payroll of $9,268,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 1,187Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 6Source: CBP |
| 1st Quarter Payroll: | $2,168,000Source: CBP |
| Annual Payroll: | $9,268,000Source: CBP |
| # of Employees: | 148Source: CBP |
ZIP Code 01831 is located in Essex County, Massachusetts, within the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area (CBSA 14460) and Massachusetts's 3rd Congressional District. This Metro area has a population of 4,917,661 people, about 0.00% of whom live in ZIP Code 01831, 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: | 4,917,661Source: Census |
| MSA: | Boston-Worcester-Lawrence, MA-NH-ME-CT CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 03Source: USPS |
| Congressional Land Area: | 757.86 sq miSource: Census |
| PMSA: | Lawrence, MA-NH PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 2529405Source: Census |
| Place Name: | Haverhill city; MassachusettsSource: Census |
We could not locate which school district 01831 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.