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Where 99328 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 99328 into a pocket calculator and turn it upside down: BZEGG — not quite a word, sorry.
- ➕ As a number, 99,328 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 97. Its digits add up to 31, a total 799 other ZIP codes share.
- 💾In binary, the way a computer stores it:
11000010000000000 - 🏠 Its numerical neighbours: 99326 (Connell, WA, 54 mi away) and 99329 (Dixie, WA, 16 mi away).
- 🔄 Backwards, 99328 becomes 82399, which is not a ZIP code at all.
- 👥 20 other ZIP codes are made of exactly the same digits (23899, 28399, 29839, 29938, 32899, 38929, …). The farthest-flung twin is 32899 in Orlando, FL, 2,351 miles away.
- 🧭 Farther north than 94% of all ZIP codes, and farther west than 91%.
- 🎯1,067 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 99328 and you would come out at 46.28°S, 62.13°E — 431 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 48m of daylight. Shortest: 8h 36m.
- 📏 At 657.3 square miles of land, 99328 is bigger than 98% of ZIP codes — room for about 499 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 3,646This ZIP3,646 |
|---|---|
| Households | 1,667This ZIP1,667 |
| Housing units | 1,977This ZIP1,977 |
| Median age | 49.3This ZIP49.3Washington38.3US 38.9 |
| Median household income | $72,756This ZIP$72,756Washington$98,141US $80,734 |
| Median home value | $272,100This ZIP$272,100Washington$564,600US $332,700 |
| Median gross rent | $982This ZIP$982Washington$1,760US $1,413 |
| Bachelor's degree or higher | 24.0%This ZIP24.0% |
| Mean commute | 21.4 minThis ZIP21.4 min |
| Population density | 5.5 / sq miThis ZIP5.5 / sq mi |
Business and tax activity
| Business establishments | 100This ZIP100 |
|---|---|
| Employees | 876This ZIP876 |
| Annual payroll | $41,733,000This ZIP$41,733,000 |
| Tax returns filed | 1,620This ZIP1,620 |
| Total adjusted gross income | $114,494,000This ZIP$114,494,000 |
Land area
| Land area | 657.29 sq miThis ZIP657.29 sq mi |
|---|---|
| Water area | 3.45 sq miThis ZIP3.45 sq mi |
Other place names in 99328
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 99328
| ZIP | City | Distance |
|---|---|---|
99361 | Waitsburg, WA | 13.3 mi |
99329 | Dixie, WA | 16.2 mi |
99347 | Pomeroy, WA | 17.4 mi |
99359 | Starbuck, WA | 21.5 mi |
99362 | Walla Walla, WA | 24.4 mi |
99402 | Asotin, WA | 25.1 mi |
99136 | Hay, WA | 27.8 mi |
99348 | Prescott, WA | 28.3 mi |
99403 | Clarkston, WA | 28.5 mi |
99324 | College Place, WA | 29.4 mi |
Find every ZIP code within 10 miles of 99328 →
Questions about this ZIP code
Where is ZIP code 99328?
99328 is in Dayton, Washington, in Columbia County. Its published point location is 46.2757, -117.8709.
What county is 99328 in?
99328 lies in Columbia County.
What area code is 99328?
Dayton uses area code 509, from NANPA's telephone records.
What time zone is 99328 in?
99328 uses America/Los_Angeles.
How many people live in 99328?
About 3,646 people live in ZIP code 99328, in 1,667 households, at 5.5 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 99328?
$72,756 a year, against $98,141 across Washington.
What ZIP codes are near 99328?
The closest are 99361 (13.3 mi), 99329 (16.2 mi), 99347 (17.4 mi), 99359 (21.5 mi) and 99362 (24.4 mi).
Is 99328 a PO Box ZIP code?
99328 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “99328 ZIP Code — Dayton, Washington (Columbia County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/99328
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/99328.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.