Middlesex County ZIP Code Coverage
This Middlesex County postal-area directory is a working inventory of postal areas represented in the research. It is not an official municipality-boundary dataset. The United States Postal Service controls the ZIP returned for a deliverable address, and a ZIP can serve a neighborhood, a portion of a municipality, a post-office route, or a special assignment. Verify every specific address before connecting it to a parcel, organization, or historical source.
| ZIP | Areas covered | Post office | Notes |
|---|---|---|---|
| 07001 | Avenel / Woodbridge area | Avenel | Postal and legal municipality can differ |
| 07008 | Carteret | Carteret | Standard delivery area; verify address |
| 07064 | Port Reading / Woodbridge | Port Reading | Postal community label |
| 07067 | Colonia / Woodbridge | Colonia | Not a separate legal municipality |
| 07077 | Sewaren / Woodbridge | Sewaren | Waterfront postal community |
| 07080 | South Plainfield | South Plainfield | County-edge coverage; verify municipality |
| 07095 | Woodbridge | Woodbridge | Delivery area may contain distinct neighborhoods |
| 08512 | Cranbury | Cranbury | Generally aligns with municipality; verify address |
| 08536 | Plainsboro | Plainsboro | Postal label and township search facet |
| 08810 | Dayton / South Brunswick | Dayton | Postal community within a larger township |
| 08812 | Dunellen | Dunellen | Borough postal area |
| 08816 | East Brunswick | East Brunswick | Township postal area |
| 08817 | Edison | Edison | Multiple Edison ZIPs; use full street address |
| 08818 | Edison PO / route | Edison | PO Box or special assignment possible |
| 08820 | Edison / nearby postal area | Edison | Check municipality boundary |
| 08824 | Kendall Park / South Brunswick | Kendall Park | Census and postal neighborhood label |
| 08828 | Helmetta | Helmetta | Borough postal area |
| 08830 | Iselin / Woodbridge | Iselin | Postal community, not a municipality |
| 08831 | Monroe / Monroe Township | Monroe | Township postal area |
| 08832 | Keasbey / Woodbridge | Keasbey | Small postal community |
| 08837 | Edison | Edison | Separate Edison delivery assignment |
| 08840 | Metuchen | Metuchen | Borough postal area |
| 08846 | Middlesex Borough | Middlesex | Postal label may be shortened |
| 08850 | Milltown | Milltown | Borough postal area |
| 08852 | Monmouth Junction / South Brunswick | Monmouth Junction | Postal community, not a township name |
| 08854 | Piscataway | Piscataway | Township postal area |
| 08855 | Piscataway PO / route | Piscataway | PO Box or special assignment; verify |
| 08857 | Old Bridge | Old Bridge | Township postal area |
| 08859 | Parlin / Sayreville | Parlin | Postal community within Sayreville |
| 08861 | Perth Amboy | Perth Amboy | City postal area |
| 08862 | Perth Amboy PO / route | Perth Amboy | PO Box or special assignment |
| 08863 | Fords / Woodbridge | Fords | Legal municipality may be Woodbridge |
| 08871 | Sayreville PO / route | Sayreville | Verify route or PO use |
| 08872 | Sayreville | Sayreville | Borough postal area |
| 08879 | South Amboy | South Amboy | City postal area |
| 08882 | South River | South River | Borough postal area |
| 08884 | Spotswood | Spotswood | Borough postal area |
| 08899 | Edison special assignment | Edison | Unique or special use must be verified |
| 08901 | New Brunswick | New Brunswick | County seat and principal city ZIP |
| 08902 | North Brunswick | North Brunswick | Township postal area |
| 08903 | New Brunswick PO / route | New Brunswick | PO Box or special assignment |
| 08904 | Highland Park | Highland Park | Borough postal area |
| 08905 | New Brunswick special assignment | New Brunswick | Exact current delivery use not confirmed |
| 08906 | New Brunswick PO / route | New Brunswick | PO Box or special assignment |
| 08933 | New Brunswick unique assignment | New Brunswick | Confirm whether current use is active or limited |
| 08989 | New Brunswick unique assignment | New Brunswick | Confirm whether current use is active or limited |
The inventory includes ordinary delivery areas as well as PO, route, and special assignments. It should be read as service-area context for a ZIP code directory, never as a current-person list or as proof that postal and municipal boundaries match.
Search Middlesex County ZIP Codes USPS First
USPS is the controlling source for the ZIP and postal city assigned to a deliverable address. Its lookup offers By Address, By City and State, and a cities-by-ZIP mode. Use the full street address first, preserve the returned postal form, then move to the municipality and tax district for property or government-record work. The result confirms postal routing, not that a particular person or organization is associated with the address.
- Enter the complete street address in the USPS By Address route, including an apartment or suite when relevant.
- Record the returned postal city and ZIP exactly as displayed, then compare that label with the legal municipality.
- Find the municipal district and parcel identifiers in the assessment or GIS system.
- Use town, party, block and lot, parcel, or legal description in the County Clerk records system if the next question concerns a recorded document.
- Keep a directory or newspaper result dated, because an older postal label can differ from a current municipal label.
USPS ZIP Code Lookup is the address-level starting point. Once the area is narrowed to a street, the Middlesex County street directory route handles the fuller address-record chain.
Middlesex County Assessment Fields
The county-linked New Jersey assessment search is organized by municipal district, not by postal ZIP. Select the database, county, and district before choosing search and output formats. The visible criteria are shown below. A ZIP criterion is not exposed on that assessment screen, so it cannot produce a complete ZIP-wide property result. Assessment data identifies a tax record and should not be treated as proof of current occupancy.
| Database, county, district | Initial selections; districts 1201 through 1225 correspond to the county's 25 municipalities. |
|---|---|
| Search format and output format | Controls selected before the criteria form becomes useful. |
| List items per page | Visible output control. |
| Location | Address-oriented criterion. |
| Owner name | Named assessment-record criterion. |
| Block, lot, qualifier | Parcel identifiers used to connect assessment, GIS, and deed research. |
| ZIP | No criterion exposed in the reviewed assessment interface. |
The Middlesex assessment search shows the database, district, format, and location or parcel-oriented controls.
The screen is useful after USPS and municipality checks have identified the right district. It does not provide a ZIP-wide resident portal or a ZIP-wide people search.
Middlesex County ZIP Code Boundaries
Postal geography and city limits do not line up neatly in Middlesex County. Fords and Iselin are postal communities in Woodbridge; Dayton and Kendall Park are postal communities within South Brunswick; Parlin is within Sayreville; and Monmouth Junction is a postal or community label within South Brunswick. Edison also has several delivery assignments. A postal label is therefore a search clue, not a substitute for the municipality that maintains a local record.
The County GIS Division and the municipal authorities route parcel mapping questions. GIS data can locate parcel geometry and block or lot context, while the assessment record provides the tax-district connection. The County Clerk's land-record search uses town, party, parcel, lot and block, map, or legal-description fields, rather than a ZIP-wide resident list.
Middlesex County ZIP Code Definitions
Postal terms help explain why several entries in the inventory need a USPS confirmation. They describe delivery organization, not legal title or municipal jurisdiction.
- ZIP
- The postal routing code USPS returns for a deliverable address or assignment.
- ZIP+4
- An added delivery-segment detail attached to the base ZIP. It is address-specific and should be confirmed through USPS.
- PO Box or unique ZIP
- A code used for a post-office, route, institution, or special assignment. It may not describe ordinary street delivery for a whole municipality.
- Carrier route
- A delivery-route grouping used by the postal system; it is not a municipal boundary or a substitute for a parcel identifier.
Middlesex County ZIP Code Portal Limits
No authoritative local portal located in the research returns every record or person for one ZIP in a single query. The GIS route is parcel and map based. The state voter-status form is person and status oriented, not a public ZIP browse. The County Clerk's Official Records Public Search uses record, town, party, parcel, and legal-description fields. Each tool has a role, but none turns a postal area into a complete resident index.
The municipality matters after a ZIP is identified. Middlesex County has 25 municipalities, each with its own local custodian for many permits, code files, and other local materials. Use the county municipality directory or the appropriate municipal office when a postal label spans a local-government boundary.
Middlesex County Parcel Routing
For a property question, preserve three different address forms: the situs address where a parcel sits, the tax mailing address for notices, and the USPS delivery address. They can differ. Block, lot, and qualifier are the steadier bridge between GIS, the assessment search, and recorded deeds. A deed can instead use a subdivision name, metes and bounds, a condominium unit, or a recorded map reference.
Middlesex County GIS links to county geodata, web applications, and static maps. Use its parcel layer as a visual lead, then verify the legal description in the assessment or deed system. The research did not confirm a single countywide public permit or code search, so requests for those records belong with the relevant municipal custodian.
Middlesex County ZIP Code Requests
When an online search cannot answer a record-specific question, direct the request to the named custodian. The county's OPRA guidance says requests normally receive a response within seven business days, subject to the record and circumstances. Identify the municipality, date range, record type, address or parcel identifier, and preferred form of access. Ask for segregable non-exempt material where a record contains protected fields.
Middlesex County's OPRA request route is the county fallback, while municipal requests belong with the municipality that holds the record. The New Jersey Open Public Records Act, P.L. 2001, c.404, N.J.S.A. 47:1A-1 et seq., does not require an agency to create a new ZIP-wide list or disclose protected information.