99128
ZIP 99128 is Farmington, Washington, mostly in Whitman County; area code 509; Pacific time.
- Type
- Standard
- Time zone
- America/Los_Angeles
- County
- Whitman +1 more
- Metro area
- Pullman, WA
- Population
- 259
- Coordinates
- 47.0979, -117.0813
Weather right now
Asking the National Weather Service…
Where 99128 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 99128 into a pocket calculator and turn it upside down: BZIGG — not quite a word, sorry.
- ➕ As a number, 99,128 = 2 × 2 × 2 × 12391. Its digits add up to 29, a total 1,296 other ZIP codes share.
- 💾In binary, the way a computer stores it:
11000001100111000 - 🏠 Its numerical neighbours: 99126 (Evans, WA, 120 mi away) and 99129 (Fruitland, WA, 81 mi away).
- 🔄 Backwards, 99128 becomes 82199, which is not a ZIP code at all.
- 👥 14 other ZIP codes are made of exactly the same digits (12989, 12998, 18929, 19892, 29819, 29918, …). The farthest-flung twin is 18929 in Jamison, PA, 2,124 miles away.
- 🧭 Farther north than 96% of all ZIP codes, and farther west than 90%.
- 🎯1,051 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 99128 and you would come out at 47.10°S, 62.92°E — 370 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 55m of daylight. Shortest: 8h 30m.
- 📏 At 59.5 square miles of land, 99128 is bigger than 64% of ZIP codes — room for about 45 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 259This ZIP259 |
|---|---|
| Households | 125This ZIP125 |
| Housing units | 158This ZIP158 |
| Median age | 57.1This ZIP57.1Washington38.3US 38.9 |
| Median household income | $58,942This ZIP$58,942Washington$98,141US $80,734 |
| Median home value | $363,500This ZIP$363,500Washington$564,600US $332,700 |
| Median gross rent | $1,089This ZIP$1,089Washington$1,760US $1,413 |
| Bachelor's degree or higher | 25.5%This ZIP25.5% |
| Mean commute | 20.8 minThis ZIP20.8 min |
| Population density | 4.4 / sq miThis ZIP4.4 / sq mi |
Business and tax activity
| Business establishments | 5This ZIP5 |
|---|---|
| Employees | 18This ZIP18 |
| Annual payroll | $797,000This ZIP$797,000 |
| Tax returns filed | 110This ZIP110 |
| Total adjusted gross income | $10,492,000This ZIP$10,492,000 |
Land area
| Land area | 59.49 sq miThis ZIP59.49 sq mi |
|---|---|
| Water area | 0.00 sq miThis ZIP0.00 sq mi |
Counties 99128 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Whitman County | 92.5% |
| Latah County | 7.5% |
Other place names in 99128
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 99128
| ZIP | City | Distance |
|---|---|---|
99104 | Belmont, WA | 4.7 mi |
83824 | Desmet, ID | 6.5 mi |
99158 | Oakesdale, WA | 7.8 mi |
99130 | Garfield, WA | 8.4 mi |
99033 | Tekoa, WA | 9.2 mi |
83870 | Tensed, ID | 11.1 mi |
83855 | Potlatch, ID | 11.6 mi |
99161 | Palouse, WA | 13.8 mi |
99018 | Latah, WA | 13.8 mi |
99174 | Steptoe, WA | 14.4 mi |
Find every ZIP code within 10 miles of 99128 →
Questions about this ZIP code
Where is ZIP code 99128?
99128 is in Farmington, Washington, in Whitman County, part of the Pullman, WA micropolitan area. Its published point location is 47.0979, -117.0813.
What county is 99128 in?
99128 spans 2 counties: Whitman County and Latah County. Most of it falls in Whitman County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 99128?
Farmington uses area code 509, from NANPA's telephone records.
What time zone is 99128 in?
99128 uses America/Los_Angeles.
How many people live in 99128?
About 259 people live in ZIP code 99128, in 125 households, at 4.4 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 99128?
$58,942 a year, against $98,141 across Washington.
What ZIP codes are near 99128?
The closest are 99104 (4.7 mi), 83824 (6.5 mi), 99158 (7.8 mi), 99130 (8.4 mi) and 99033 (9.2 mi).
Is 99128 a PO Box ZIP code?
99128 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “99128 ZIP Code — Farmington, Washington (Whitman County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/99128
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/99128.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.