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Where 99138 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 99138 into a pocket calculator and turn it upside down: BEIGG — not quite a word, sorry.
- ➕ As a number, 99,138 = 2 × 3 × 13 × 31 × 41. Its digits add up to 30, a total 1,024 other ZIP codes share.
- 💾In binary, the way a computer stores it:
11000001101000010 - 🏠 Its numerical neighbours: 99137 (Hunters, WA, 14 mi away) and 99139 (Ione, WA, 62 mi away).
- 🔄 Backwards, 99138 becomes 83199, which is not a ZIP code at all.
- 👥 11 other ZIP codes are made of exactly the same digits (19398, 19893, 19938, 31998, 39189, 39819, …). The farthest-flung twin is 19938 in Clayton, DE, 2,188 miles away.
- 🧭 Farther north than 98% of all ZIP codes, and farther west than 92%.
- 🎯1,138 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 99138 and you would come out at 48.23°S, 61.61°E — 399 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 16h 05m of daylight. Shortest: 8h 20m.
- 📏 At 566.6 square miles of land, 99138 is bigger than 98% of ZIP codes — room for about 430 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,223This ZIP1,223 |
|---|---|
| Households | 468This ZIP468 |
| Housing units | 670This ZIP670 |
| Median age | 44.6This ZIP44.6Washington38.3US 38.9 |
| Median household income | $50,833This ZIP$50,833Washington$98,141US $80,734 |
| Median home value | $218,100This ZIP$218,100Washington$564,600US $332,700 |
| Median gross rent | $535This ZIP$535Washington$1,760US $1,413 |
| Bachelor's degree or higher | 21.9%This ZIP21.9% |
| Mean commute | 21.9 minThis ZIP21.9 min |
| Population density | 2.2 / sq miThis ZIP2.2 / sq mi |
Business and tax activity
| Business establishments | 17This ZIP17 |
|---|---|
| Employees | 72This ZIP72 |
| Annual payroll | $2,927,000This ZIP$2,927,000 |
| Tax returns filed | 490This ZIP490 |
| Total adjusted gross income | $24,793,000This ZIP$24,793,000 |
Land area
| Land area | 566.57 sq miThis ZIP566.57 sq mi |
|---|---|
| Water area | 31.18 sq miThis ZIP31.18 sq mi |
Other place names in 99138
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 99138
| ZIP | City | Distance |
|---|---|---|
99137 | Hunters, WA | 13.9 mi |
99131 | Gifford, WA | 14.4 mi |
99140 | Keller, WA | 14.4 mi |
99167 | Rice, WA | 17.2 mi |
99129 | Fruitland, WA | 18.7 mi |
99101 | Addy, WA | 21.7 mi |
99147 | Lincoln, WA | 25.9 mi |
99173 | Springdale, WA | 27.9 mi |
99155 | Nespelem, WA | 28.8 mi |
99166 | Republic, WA | 29.0 mi |
Find every ZIP code within 10 miles of 99138 →
Questions about this ZIP code
Where is ZIP code 99138?
99138 is in Inchelium, Washington, in Ferry County. Its published point location is 48.2314, -118.3909.
What county is 99138 in?
99138 lies in Ferry County.
What time zone is 99138 in?
99138 uses America/Los_Angeles.
How many people live in 99138?
About 1,223 people live in ZIP code 99138, in 468 households, at 2.2 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 99138?
$50,833 a year, against $98,141 across Washington.
What ZIP codes are near 99138?
The closest are 99137 (13.9 mi), 99131 (14.4 mi), 99140 (14.4 mi), 99167 (17.2 mi) and 99129 (18.7 mi).
Is 99138 a PO Box ZIP code?
99138 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “99138 ZIP Code — Inchelium, Washington (Ferry County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/99138
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/99138.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.