Kennewick ZIP Directory Coverage
Official postal material verifies three city-name associations for Kennewick: 99336, 99337, and 99338. The archived USPS L001 table supplies that set, while the current USPS lookup is the right place to test an address today. The available official sources do not support assigning neat neighborhood names or a current post-office station to each code. That missing detail matters. A ZIP code directory should state what is verified, not draw boundaries from common usage or one sample address.
| ZIP Code | Areas Covered | Post Office | Notes |
|---|---|---|---|
| 99336 | Kennewick postal addresses | Confirm with USPS | Not a municipal boundary |
| 99337 | Kennewick postal addresses | Confirm with USPS | Verified in the official postal table |
| 99338 | Kennewick postal addresses | Confirm with USPS | Mailing and situs use can differ |
Use the USPS ZIP Lookup for a current answer. It supports an address search, a city-and-state search, and a reverse city-by-ZIP check. A Washington Department of Health planning table also lists the same three Benton County codes, but it is corroboration rather than a postal boundary map. Richland and West Richland codes should not be folded into a Kennewick list merely because all are part of the Tri-Cities.
Three Kennewick Postal Checks
Each USPS mode answers a different question. Address mode standardizes a particular street line. City mode returns codes associated with Kennewick. Reverse mode checks which city names USPS associates with a supplied code. None names a resident. That warning is part of the postal service's own lookup and keeps a valid delivery point from being treated as proof that a person lives there.
| Search mode | Input | Useful result |
|---|---|---|
| By Address | Street, unit, city, state | Standardized address and current ZIP |
| By City and State | Kennewick, Washington | Associated postal codes |
| Cities by ZIP | A five-digit code | Postal city and state associations |
Record the unit line exactly. Apartment formatting can change whether a search resolves. If the postal answer differs from a county card, label both results and their dates rather than forcing one into the other source's role.
Kennewick ZIP Fields Can Split
A real Benton County assessor card makes the difference plain. The sample parcel's situs, meaning physical property location, is 95 E 22nd Place in 99337. Its owner mailing address is in 99338. The second code tells where tax correspondence goes. It does not move the parcel, place it in another neighborhood, or prove who occupies the house.
The sample Kennewick parcel card shows both fields on one official record, a useful warning against treating every printed ZIP as the property's physical postal code.
Find Residents Within Kennewick ZIPs
A ZIP narrows the area before a name or parcel search. The assessor portal exposes address, owner, parcel, map, and sales routes, and each returned card includes situs city, state, and ZIP plus a separate owner mailing address. The initial text capture did not document a reliable ZIP-wide filter control, so do not promise a bulk list. Work from validated addresses and map results, then label each situs code.
- Validate the full address through USPS, including any unit.
- Open the Benton County Property Search and search by address or map.
- Copy the parcel ID, legal description, situs ZIP, map ID, and record year from the card.
- Use the map to compare nearby parcels, without assuming a mailing recipient is an occupant.
- For historical names, check a dated city directory and preserve its printed postal wording.
Once a postal area is narrowed to a road, the Kennewick street directory gives the full street-level record sequence. Current voter and precinct lists have separate Washington access and use rules; they should never be inferred from a property map.
Kennewick ZIP Parcel Evidence
The county property result carries far more than a postal code. It can show a property ID, parcel or Geo ID, abbreviated legal description, land-use and tax-area codes, township and range, legal acreage, situs address, Mapsco reference, neighborhood code, owner name, mailing address, tax fields, improvements, land, sales history, and a map link. Those fields let a researcher test whether two similar Kennewick addresses point to one parcel.
The official assessor search screen is the correct starting point for that comparison. Its search routes lead to dated county work-paper records, not a guaranteed current occupant list.
For access trouble, contact the Benton County Assessor at its Kennewick administrative office, 7122 W. Okanogan Place, Building E, by phone at 509-735-2394 or by email at assessor@co.benton.wa.us. In-person help is an important fallback when map controls or result pages change.
Kennewick ZIPs and City Limits
Postal geography is built to route mail. Kennewick's municipal line, Benton County tax areas, census units, school districts, and named neighborhoods are built for other purposes. They can overlap without matching. The Columbia River setting also encourages loose regional labels: Kennewick sits on the southwest bank opposite Pasco, near the Yakima River confluence, but a Tri-Cities label does not turn every regional ZIP into a Kennewick code.
A city parcel map can test municipal and parcel context. USPS tests postal context. Never sketch an official boundary from a few returned addresses. The research did not locate a current official ZIP-boundary map or verified station-to-ZIP table, so the sound fallback is a current USPS address check paired with county GIS and city planning maps.
- ZIP code
- A five-digit postal routing code, not a city or neighborhood boundary.
- ZIP+4
- A more specific delivery segment added to the five-digit base.
- PO-box ZIP
- A code or delivery pattern assigned to post-office boxes rather than street geography.
- Unique ZIP
- A postal code assigned to one large organization; none is verified here for Kennewick.
- Carrier route
- A mail-delivery path inside a ZIP, not a public resident roll.
Historic Kennewick Postal Clues
Older Polk directories and telephone books may print a street, route, or city section in forms that do not match a modern standardized address. Washington State Library holdings cover Kennewick-related directory runs in 1911-1918 and many years from 1952 through 2013, with gaps. Separate telephone-book holdings include 1958 and 1964. Those dates are snapshots, not continuous ZIP coverage.
Search the correct year and city section, then test adjacent years, initials, and other household members. Match the old entry to a parcel ID, addition name, or legal description before translating it into current geography. The Washington State Library directory inventory is on-site only and has limited appointment access, so contact staff before planning a visit.
Note: A historical address is dated evidence, while a current ZIP result describes today's postal routing.
Keep Kennewick ZIP Results Distinct
A short evidence table prevents a mailing code, situs code, and historical label from being merged. For every hit, record the source, date checked, address type, exact printed result, and parcel or file number. Add a note for any mismatch. This practice is especially valuable when an owner is an LLC, trust, or estate, because the assessor name and correspondence address may reveal nothing about who lives at the site.
| Evidence | Label to save | What it can establish |
|---|---|---|
| USPS result | Standardized postal address and check date | Current postal association |
| Assessor card | Situs, mailing, parcel ID, roll year | Mapped parcel and owner of record |
| GIS view | Layer, parcel, map date | Spatial and adjacent-parcel context |
| Historical directory | Title, year, page, printed address | A dated name-and-address clue |
When an online portal fails, use its custodian. Assessor staff can help with property cards, State Library staff can explain directory access, and USPS remains the authority for current postal formatting. That fallback chain is more reliable than guessing from a map pin.