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Where 66538 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 66538 into a pocket calculator and turn it upside down: BESgg — not quite a word, sorry.
- ➕ As a number, 66,538 = 2 × 17 × 19 × 103. Its digits add up to 28, a total 1,520 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10000001111101010 - 🏠 Its numerical neighbours: 66537 (Scranton, KS, 78 mi away) and 66539 (Silver Lake, KS, 50 mi away).
- 🔄 Backwards, 66538 becomes 83566, which is not a ZIP code at all.
- 👥 19 other ZIP codes are made of exactly the same digits (36568, 36685, 36856, 36865, 38665, 56368, …). The farthest-flung twin is 85366 in Yuma, AZ, 1,147 miles away.
- 🧭 Farther north than 55% of all ZIP codes, and farther west than 71%.
- 🎯134 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 66538 and you would come out at 39.85°S, 83.96°E — 939 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 00m of daylight. Shortest: 9h 20m.
- 📏 At 136.8 square miles of land, 66538 is bigger than 85% of ZIP codes — room for about 104 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 3,602This ZIP3,602 |
|---|---|
| Households | 1,361This ZIP1,361 |
| Housing units | 1,509This ZIP1,509 |
| Median age | 41.3This ZIP41.3Kansas37.4US 38.9 |
| Median household income | $78,981This ZIP$78,981Kansas$74,275US $80,734 |
| Median home value | $299,300This ZIP$299,300Kansas$217,200US $332,700 |
| Median gross rent | $808This ZIP$808Kansas$1,060US $1,413 |
| Bachelor's degree or higher | 32.9%This ZIP32.9% |
| Mean commute | 11.3 minThis ZIP11.3 min |
| Population density | 26.3 / sq miThis ZIP26.3 / sq mi |
Business and tax activity
| Business establishments | 176This ZIP176 |
|---|---|
| Employees | 2,352This ZIP2,352 |
| Annual payroll | $115,104,000This ZIP$115,104,000 |
| Tax returns filed | 1,640This ZIP1,640 |
| Total adjusted gross income | $138,662,000This ZIP$138,662,000 |
Land area
| Land area | 136.79 sq miThis ZIP136.79 sq mi |
|---|---|
| Water area | 0.03 sq miThis ZIP0.03 sq mi |
Other place names in 66538
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 66538
| ZIP | City | Distance |
|---|---|---|
66522 | Oneida, KS | 5.8 mi |
66404 | Baileyville, KS | 6.9 mi |
66408 | Bern, KS | 7.8 mi |
66534 | Sabetha, KS | 11.2 mi |
66415 | Centralia, KS | 12.2 mi |
66403 | Axtell, KS | 12.3 mi |
68345 | Du Bois, NE | 12.9 mi |
66417 | Corning, KS | 13.4 mi |
66428 | Goff, KS | 13.5 mi |
66544 | Vermillion, KS | 16.5 mi |
Find every ZIP code within 10 miles of 66538 →
Questions about this ZIP code
Where is ZIP code 66538?
66538 is in Seneca, Kansas, in Nemaha County. Its published point location is 39.8506, -96.0447.
What county is 66538 in?
66538 lies in Nemaha County.
What area code is 66538?
Seneca uses area code 785, from NANPA's telephone records.
What time zone is 66538 in?
66538 uses America/Chicago.
How many people live in 66538?
About 3,602 people live in ZIP code 66538, in 1,361 households, at 26.3 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 66538?
$78,981 a year, against $74,275 across Kansas.
What ZIP codes are near 66538?
The closest are 66522 (5.8 mi), 66404 (6.9 mi), 66408 (7.8 mi), 66534 (11.2 mi) and 66415 (12.2 mi).
Is 66538 a PO Box ZIP code?
66538 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “66538 ZIP Code — Seneca, Kansas (Nemaha County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/66538
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/66538.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.