Suisun City ZIP Code Directory Coverage
Research identifies one verified standard city ZIP for current Suisun City addresses: 94585. It serves incorporated neighborhoods, including Old Town and waterfront areas, while the same postal territory also reaches east and southeast into rural and unincorporated places. Birds Landing and Lambie Road are part of the documented boundary caution. The postal label answers a delivery question, not a jurisdiction question.
| ZIP | Areas Covered | Post Office | Notes |
|---|---|---|---|
| 94585 | Incorporated Suisun City neighborhoods, Old Town, waterfront areas, and broader rural or unincorporated postal territory east and southeast, including documented Birds Landing and Lambie Road addresses | Suisun City Post Office 325 Merganser Dr. 707-425-1334 | Retail Mon-Fri 9:30-5 and Sat 10-1; General Delivery and PO Box Online; postal territory is not the city limit |
No second city ZIP, unique ZIP, PO-box-only ZIP, ZIP realignment, or local ZIP-wide portal filter was verified. Nearby Fairfield and Travis AFB ZIP codes should not be added simply because USPS lists them as nearby locations.
The USPS Suisun City Post Office listing provides the source record for the counter details shown above.
The post-office record is useful for delivery services and counter access. It does not turn a postal address into proof of incorporation or current residence.
General Delivery and PO Box Online are access channels for mail handling, not people-search tools. A post-office service can explain where mail is routed or held while the parcel and resident questions still belong to the proper local custodian.
Why 94585 Reaches Beyond Suisun City
94585 is a postal service area, not a clean polygon around the incorporated municipality. That is why a Birds Landing or Lambie Road address can carry the Suisun City ZIP while falling in rural or unincorporated geography. City and County geographic information system (GIS) maps, not the postal label, should decide which public office has jurisdiction over land, permits, and boundary questions.
Proposal status matters here. In July 2024, Suisun City noticed a proposed 129-acre Highway 12 Logistics Center annexation. In November 2025, a notice described a proposed 22,873-acre Suisun Expansion area. Both are proposals, not accomplished boundary changes. Before relying on either one, check current City or County GIS and ask the planning office which custodian handles the address.
This distinction also explains why one address can lead to more than one office. City staff may hold a permit or municipal file, while Solano County holds parcel and deed material. The postal label helps start the routing decision, but it does not replace the jurisdiction check.
Finding Suisun City Residents by ZIP Code
A ZIP is a starting key, not a public name list. For a lawful personal search, begin with a known address or a known name, verify the postal assignment, and then choose the local record keyed to the question.
- Verify delivery. Enter the address in the USPS by-address lookup. Save the returned ZIP, but treat it as delivery evidence only.
- Check jurisdiction. Open the Solano ReGIS applications and inspect the parcel and City/County Boundary layers. GIS shows geography, not a resident roster.
- Follow the parcel. Use the Assessor address or assessor parcel number (APN) search for the land record that sits behind the postal label. An APN is a parcel key, not a person match.
- Check recorded transactions. If a deed or lien matters, move from the parcel clue to the Recorder grantor/grantee index. It is not searchable by street address.
- Keep voter data restricted. California My Voter Status is authenticated self-service. A full voter file requires an approved election, scholarly, journalistic, political, or governmental purpose and cannot become a public ZIP directory.
Once a ZIP narrows the geography, the Suisun City street directory is the appropriate handoff for street-level address work. The ZIP page should stop at postal territory and jurisdiction rather than rebuild that chain.
There is no verified local search that takes 94585 and returns every person tied to it. A ZIP can narrow a research question, but a name, address, APN, deed number, case number, or historical event still has to anchor the next request.
USPS Fields for the Suisun City ZIP Code Lookup
The USPS ZIP lookup by address is the ZIP-capable search tool documented for Suisun City. Its purpose is to verify delivery. It does not search residents, prove a city boundary, or supply a county parcel record.
| Field or control | Type | Required | Use |
|---|---|---|---|
| Street address | Text | Yes | Enter the delivery address whose postal assignment needs checking. |
| City | Text | Yes | Pair the address with its postal city label; that label is not municipal proof. |
| State | Select or text | Yes | Use California for a Suisun City address. |
| Lookup or Find | Button | Yes | Submit the by-address request and read the returned delivery ZIP. |
| Returned ZIP | Result | Not applicable | Compare the result with GIS before routing a local records request. |
The USPS by-address lookup interface is the source for the delivery check shown here.
A returned 94585 result can support a mail question. A parcel or boundary question still belongs with Solano County or Suisun City records staff.
For a rural edge address, save both the USPS result and the GIS result. The pair makes the postal-versus-jurisdiction distinction clear when a request is sent to a city department, county office, or archive.
ZIP Code Terms for Suisun City Searches
Four postal terms are easy to confuse with local geography. Keeping them separate prevents a delivery result from being overstated as a resident or parcel result.
- ZIP versus ZIP+4
- A five-digit ZIP groups a postal delivery area. ZIP+4 adds four digits that narrow a delivery segment inside it; neither format sets city limits.
- PO-box ZIP
- A ZIP used mainly for post-office boxes. No separate PO-box-only ZIP was verified for Suisun City.
- Unique ZIP
- A ZIP assigned to one high-volume organization or location. No Suisun City unique ZIP was verified.
- Carrier route
- An operational mail path within a ZIP. It is not a municipal district, parcel layer, or resident list.
These terms explain USPS output, not the reach of a local directory. Research found no ZIP realignment and no local portal that promises a ZIP-wide resident filter, so a search should remain tied to a known address, APN, name, or record number.
ZIP+4 and carrier-route detail can refine delivery handling without changing the five-digit city question. A PO box or unique ZIP would also describe a postal arrangement, not a list of residents, and neither special category was verified locally.
Suisun City ZIP Code Parcel Follow-Ons
After USPS confirms the delivery area, local records answer different questions. The Assessor and GIS work from an address or APN, while the Recorder works from indexed parties and recorded instruments.
Solano County Assessor
The Assessor property search accepts an address or APN. Public owner-name posting is restricted by Government Code section 7928.205. Ownership information is not available online or by phone; the Research Area is at 675 Texas St., Suite 2700, Fairfield, Monday-Friday 9-4, 707-784-6210, Assessor@solanocounty.gov.
GIS jurisdiction check
The Solano GIS parcel viewer searches by address or APN and displays parcels, boundaries, districts, and physical address details. Owner and mailing names are absent. The map is geographic evidence, not a certified deed.
Recorder deed trail
The Solano official-records index searches grantor and grantee names, meaning the parties transferring and receiving an instrument, plus dates and document types, not street addresses. Computer searching reaches 1955; 1954 and earlier require the office research area. Copies can be requested in person or by mail, with the current schedule of $9 for the first page, $1 for each added page, and $5 certification. Phone 707-784-6290 is for procedure.
A postal directory can connect a delivery area to these follow-ons without claiming that a parcel record identifies every person at an address. Mailing address, situs address meaning the physical parcel location, deed party, and current resident are different facts.
The Recorder's online index is a party index, so an address-first search must move through the APN or a known recorded party. For older work, the Fairfield research area and historical-records channels are the documented fallback rather than an assumed ZIP search.
Suisun City ZIP Code Boundary Help
Planning and Development Services is the local contact when a 94585 address raises an annexation, addressing, or jurisdiction question. The office is at 701 Civic Center Blvd.; planning@suisun.com and developmentservices@suisun.com; 707-421-7333. The counter is open Monday and Wednesday 9-12 and 1-5, Tuesday and Thursday by appointment, and closed Friday.
The Suisun City public-records request channel and its mail fallback help when a permit, boundary, or administrative record is not exposed in a searchable portal. A focused request names the date range, department, and record description. The City normally determines whether disclosable records exist within 10 calendar days, subject to a 14-day extension.
Note: A records request asks a custodian to locate existing material; it does not create a ZIP-wide resident directory or change the postal boundary.
Planning staff can also clarify whether an address belongs to a city service area or a broader county geography. That answer is more useful than treating a postal city name as the final word on jurisdiction.
What the Suisun City ZIP Code Directory Cannot Show
A ZIP result cannot show who currently lives at an address. GIS can show a parcel and its neighbors, the Assessor can provide address or APN routes subject to privacy limits, and the Recorder can show a named party to a recorded transaction. None is a complete household list.
California voter data is even narrower. My Voter Status is for an authenticated voter checking a personal record. Released voter files are purpose-limited, exclude protected information, and cannot be republished as an ordinary ZIP directory. A no-result response may reflect confidentiality, a coverage limit, a spelling issue, or the fact that no public ZIP-wide filter exists.
For family reconnection, an heir question, or a civic records check, the sound sequence is USPS delivery verification, City or County GIS, an address or APN search, and then the custodian that holds the relevant deed, permit, court, or historical record. For Suisun City, 94585 is the only verified standard city ZIP in the research, while proposed annexations remain proposals and not completed boundaries.
Historical questions can use the ZIP as a location clue without treating it as proof of a past resident. The Solano library obituary and newspaper request service accepts an event date, subject name, and city or location, searches the event date through two weeks afterward, and can return a free emailed PDF. That is a documented family-history route, not a current ZIP roster.