In which county is ZIP code 99128 located?

ZIP 99128 is listed under Whitman, WA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 99128: Farmington, WA

ZIP: 99128

County: Whitman

Coordinates: 47.08470, -117.07630

ZIP Type: Standard

Time Zone: Pacific Time (PT)

This profile provides an in-depth look at ZIP code 99128, serving Farmington in WA. It lies in Whitman and supports delivery, planning, and address verification.

Primary City	Farmington
ZIP Code	99128
County	Whitman
State	WA
Latitude / Longitude	47.08470, -117.07630
ZIP Type	Standard
Time Zone	Pacific Time (PT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 99128 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 99128 are listed as 47.08470 / -117.07630, useful for GPS and service checks in and around Farmington, WA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 99128 for mail delivery and general location reference in Whitman, WA.

This ZIP may extend beyond the city core into nearby communities within Whitman.

Related ZIP Codes (Nearby)

Explore other postal codes near Farmington within WA.

Frequently Asked Questions

What is the primary city for ZIP code 99128?

The primary city for this ZIP code is Farmington, located in WA.

In which county is 99128 located?

ZIP code 99128 is situated within Whitman, WA.

What are the coordinates for 99128?

The approximate center point is 47.08470 (Latitude) and -117.07630 (Longitude).

Is ZIP code 99128 active?

This page lists ZIP 99128 as Listed based on the latest refresh date shown above.

Does ZIP 99128 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

Methodology & Data Notes

How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.

Page updated: 2026-01-08