Browse Concord ZIP Codes

Concord ZIP Code Coverage

Concord's city address layer is the strongest local boundary source because it keeps incorporated municipality, postal community, postal code, and neighborhood community in separate fields. That split matters when a Concord ZIP code directory is used to sort addresses: a delivery label can point toward a neighboring community even when the parcel sits inside Concord. Six ZIP rows are supported for incorporated Concord evidence in the reviewed layer, but they describe postal and municipal combinations, not a single resident list.

Post office names are not located in the official city or county sources reviewed, so no station name is assigned to any row. The table does not claim that every address in a postal area is incorporated Concord. It records the six postal codes evidenced at the Concord layer and keeps each Concord edge visible.

Codes 94553, 94565, and 94598 appear in broader combined service data, but no incorporated Concord street-delivery evidence was found for them. Concord's evidence does not extend to those codes, so they are excluded rather than treated as Concord ZIP codes.

The Concord GIS distinct-value query exposes the four address-layer fields used to compare these combinations.

For Concord, the query is useful because it separates Post_Code from Post_Comm and Inc_Muni, making a postal label a fact to check instead of a shortcut for the city boundary.

Postal Names Inside Concord ZIP Codes

Concord's local geography is easier to read when each field keeps its own role. Inc_Muni identifies the incorporated municipality in the city layer. Post_Comm carries the postal community label. Post_Code holds the postal code itself, while Nbrhd_Comm supplies a neighborhood-community value that is not the same as either city or postal jurisdiction.

That distinction explains the 94523 edge. An incorporated Concord point can carry Pleasant Hill in Post_Comm without changing Inc_Muni to Pleasant Hill. The same pattern appears toward Clayton in 94517 and 94521. A search that matches only the postal city can miss Concord's municipal record, while a search that forces every postal label to read Concord can misstate how mail is addressed.

Note: Read Inc_Muni for incorporated-city evidence, Post_Comm for delivery wording, and Post_Code for the ZIP filter.

Verify a Concord Postal Code

A Concord postal search should begin with the exact delivery address when one is known. The Concord ZIP code directory should retain the USPS result before comparing it with Concord's municipal fields. The by-address route verifies delivery wording for one address; it does not identify occupants, decide incorporation, or supply the unlocated station names.

The USPS ZIP Code Lookup is the captured public entry point. Its by-address path is available at USPS by-address lookup, where the recorded fields are narrow and practical.

The USPS view keeps the first check focused on a delivery result, which can then be compared with Concord's GIS fields rather than copied into a city field without review.

Keep the result with the address you entered. A mismatch between a form's city string and the USPS result is a prompt to compare Concord's Post_Comm and Inc_Muni, not a reason to invent a local post office fact.

Locate Concord Residents by ZIP

A postal filter is useful, but no single Concord resident roll accepts it as a complete answer. Property systems are address and APN based. Voter tools are normally self-service. A lawful search therefore moves from postal verification to a record key and keeps each result tied to the kind of record that produced it.

1. Run the exact address through USPS and save the returned ZIP and postal city wording.
2. Search the Concord city address layer or county map by address or road, then compare Inc_Muni, Post_Comm, Post_Code, and Nbrhd_Comm.
3. Carry the parcel's APN into the county assessor or tax route when a property record is the proper next source.
4. Use California My Voter Status or Contra Costa My Voting Information for a Concord voter's own registration and ballot details, not as a public name directory.
5. For an identifiable Concord city or county administrative record that is not online, route a CPRA request to the department with the ZIP, address or APN, record type, and date range.

When the ZIP has narrowed the question to one street, the Concord street directory carries the work into address-keyed records. That handoff is more reliable than treating a ZIP result as a list of everyone at a postal label.

ZIP Filters Before the APN Handoff

The Contra Costa County Assessor is an address and parcel route rather than a verified public owner-name directory. Use the ZIP to narrow the map or address set, then use the APN as the stronger key. The Concord CCMap viewer accepts an address or road search, reveals parcel outlines and APNs, and lets a user add mapped layers.

The APN is displayed as ten digits in a form such as 123-456-789-0. A matching Concord APN can then be carried to the Contra Costa tax lookup by APN or situs address. The tax result shows account, installment, balance, and penalty information. A tax mailing address, where lawfully displayed, is a correspondence clue, not proof of occupancy.

Concord ZIP Code Mismatches

ZIP boundaries and Concord city limits answer different questions. A Concord postal community describes delivery convention, while Inc_Muni in the city layer separates incorporated Concord from Clayton, Pleasant Hill, and unincorporated points. The difference is most visible at the edges. A Concord address can carry Clayton or Pleasant Hill postal wording, and a postal area can also include points outside the incorporated city.

ZIP vs ZIP+4

A ZIP is the five-digit delivery area; ZIP+4 adds four digits for a more precise delivery segment.

PO-box ZIP

A postal code used for mail addressed to post-office boxes rather than a normal street delivery point.

Unique ZIP

A code assigned to one high-volume organization or other designated delivery destination, not a claim about a Concord location.

Carrier route

A postal grouping of delivery points used to organize a route; it is not a city boundary or a resident roster.

These definitions describe postal concepts only. The reviewed Concord sources do not verify a local PO-box-only or unique ZIP, so the terms should not be turned into local claims.

Concord ZIP Codes That Say Clayton

The Clayton wording in 94517 and 94521 is a local comparison point, not an error to correct by hand. Those ZIP rows sit on a southeastern and eastern edge of Concord where the city layer shows Concord, Clayton, and unincorporated combinations. A postal form can therefore return Clayton while a municipal or parcel record still points to incorporated Concord.

The same reading keeps 94523 understandable on the Pleasant Hill-facing edge. Comparing the fields is safer than replacing a postal name with a preferred city name, especially when a later APN or legal description must carry the search.

Current and Legacy Concord Street Fields

Concord's NENA-model address layer, migrated June 29, 2020, retains current and legacy street components. NENA-model here means a standardized address-data design that keeps separate number, street, postal, and jurisdiction fields. Those legacy values help connect a modern ZIP result with an older Concord directory, map, or deed reference.

The continuity problem is concrete. The city EIR identifies Second Street as Bacon Street and Maltby Avenue as Park Avenue, while old numbers did not align cleanly with modern numbers. For a historical Concord address, keep the current street, legacy street, ZIP fields, APN, legal description, and Sanborn footprint together. The path is current address to postal fields, then APN, then the historical source. ZIP alone is too broad for that bridge.

Note: No dated citywide realignment list was verified, so individual old street references need source-by-source checking.

What Concord ZIP Records Do Not Prove

A Concord postal result does not prove who lives at an address. Parcel systems can identify a situs address, geometry, APN, and sometimes a mailing party, but the research warns that owner, tax mailing recipient, and occupant are not synonyms. Renters, relatives, minors, and protected people ordinarily will not appear as a complete household in a parcel index.

Concord voter tools have a separate boundary. California's state and county pages are self-service lookups, not public name directories. Voter registration information is outside ordinary CPRA access and is limited by Elections Code §§ 2188, 2194, and 18109, Government Code § 7924.000, and related access rules. Safe at Home participants and other confidential records must not be reverse-mapped from a postal label.

Unverified Facts About Concord ZIP Codes

The reviewed sources do not publish authoritative Concord station names, a verified local PO-box-only or unique ZIP, or a dated ZIP realignment. Those are research gaps, not missing rows to fill with a guess. The six rows above are the verified incorporated-Concord evidence from the city address layer, and the post-office column remains expressly unresolved.

If a postal question cannot be answered online, a written CPRA request can go to the Concord city or county department that holds the identifiable administrative record. Give the record type, ZIP, address or APN, and date range. Under the California Public Records Act (CPRA), Gov. Code §§ 7920.000-7931.000, a determination is ordinarily due within 10 days and may be extended by 14 days for unusual circumstances; inspection is generally free, while copies can carry direct duplication costs.

For one Concord delivery address, the USPS by-address check remains the grounded fallback. For a city-boundary question, compare the address-layer fields. For a property trail, preserve the APN and move to Concord's county record keeper. That sequence keeps the Concord ZIP code directory useful without asking it to answer a question postal data cannot answer. A complete Concord ZIP code directory entry still needs the address, source date, and municipal comparison.