| City: | Trenton, New Jersey |
| County: | Mercer County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 8:26:35 PM |
| Population: | No Population Data |
| Area Codes: | 609 / 640 |
| Classification: | PO Box |
| Coordinates: | 40.2167, -74.7433 |
| Quick Link: |
ZIP 08603 serves a compact section of Trenton's Hanover Academy neighborhood, where S Montgomery Street hosts the area's only street delivery route. With 78 PO Boxes and just 12 business addresses, this ZIP primarily functions as a postal hub for residents who prefer box service over street delivery. The post office sits within the larger 08608 ZIP code area, creating a nested arrangement common in urban centers where dedicated PO Box facilities serve specific neighborhoods.
The single street route on S Montgomery Street handles 25 delivery records, all tied to multi-unit addresses. This concentration suggests apartment buildings or converted residential properties rather than single-family homes. Most delivery in the broader area happens through neighboring ZIP codes, making 08603 less a geographic district and more a specialized mail sorting point for box holders in downtown Trenton.
Only S Montgomery Street receives carrier delivery in this ZIP, with all 25 records designated for multi-unit buildings. The street name honors Revolutionary War general Richard Montgomery, fitting for New Jersey's capital city where historical street names dominate the downtown grid.
ZIP Code 08603 is designated for PO Box delivery only; business establishment and employment data are not available.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 84Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 08603 is located in Mercer County, New Jersey, within the Trenton-Princeton, NJ Metropolitan Statistical Area (CBSA 45940) and New Jersey's 12nd Congressional District. This Metro area has a population of 366,513 people, about 0.00% of whom live in ZIP Code 08603. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Trenton-Princeton, NJSource: Census |
| CBSA Number: | 45940Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 366,513Source: Census |
| MSA: | New York-Northern New Jersey-Long Island, NY-NJ-CT-PASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 12Source: USPS |
| Congressional Land Area: | 412.23 sq miSource: Census |
| PMSA: | Trenton, NJ PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 3474000Source: Census |
| Place Name: | Trenton city; New JerseySource: Census |
We could not locate which school district 08603 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 March 1, 2026.