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Where 50136 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 50136 into a pocket calculator and turn it upside down: gEIOS — not quite a word, sorry.
- ➕ As a number, 50,136 = 2 × 2 × 2 × 3 × 2089. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100001111011000 - 🏠 Its numerical neighbours: 50135 (Kellogg, IA, 37 mi away) and 50137 (Killduff, IA, 34 mi away).
- 🔄 Backwards, 50136 becomes 63105 — and that is a real ZIP code: Saint Louis, MO, 221 miles away.
- 👥 66 other ZIP codes are made of exactly the same digits (01536, 01653, 03561, 05361, 06153, 06351, …). The farthest-flung twin is 01536 in North Grafton, MA, 1,059 miles away.
- 🧭 Farther north than 71% of all ZIP codes, and farther west than 62%.
- 🎯348 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 50136 and you would come out at 41.47°S, 87.71°E — 1,004 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 11m of daylight. Shortest: 9h 10m.
- 📏 At 39.8 square miles of land, 50136 is bigger than 53% of ZIP codes — room for about 30 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 376This ZIP376 |
|---|---|
| Households | 145This ZIP145 |
| Housing units | 173This ZIP173 |
| Median age | 50.8This ZIP50.8Iowa38.6US 38.9 |
| Median household income | $75,625This ZIP$75,625Iowa$75,059US $80,734 |
| Median home value | $97,800This ZIP$97,800Iowa$208,000US $332,700 |
| Median gross rent | $1,083This ZIP$1,083Iowa$972US $1,413 |
| Bachelor's degree or higher | 17.6%This ZIP17.6% |
| Mean commute | 25.1 minThis ZIP25.1 min |
| Population density | 9.4 / sq miThis ZIP9.4 / sq mi |
Business and tax activity
| Business establishments | 11This ZIP11 |
|---|---|
| Employees | 41This ZIP41 |
| Annual payroll | $1,812,000This ZIP$1,812,000 |
| Tax returns filed | 180This ZIP180 |
| Total adjusted gross income | $10,936,000This ZIP$10,936,000 |
Land area
| Land area | 39.82 sq miThis ZIP39.82 sq mi |
|---|---|
| Water area | 0.01 sq miThis ZIP0.01 sq mi |
Counties 50136 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Keokuk County | 94.4% |
| Iowa County | 5.6% |
Other place names in 50136
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 50136
| ZIP | City | Distance |
|---|---|---|
50255 | Thornburg, IA | 2.2 mi |
50104 | Gibson, IA | 5.2 mi |
52355 | Webster, IA | 5.3 mi |
50268 | What Cheer, IA | 5.6 mi |
52222 | Deep River, IA | 7.8 mi |
50027 | Barnes City, IA | 9.2 mi |
52308 | Millersburg, IA | 10.0 mi |
52550 | Delta, IA | 11.3 mi |
52316 | North English, IA | 11.5 mi |
52591 | Sigourney, IA | 11.8 mi |
Find every ZIP code within 10 miles of 50136 →
Questions about this ZIP code
Where is ZIP code 50136?
50136 is in Keswick, Iowa, in Keokuk County. Its published point location is 41.4695, -92.2928.
What county is 50136 in?
50136 spans 2 counties: Keokuk County and Iowa County. Most of it falls in Keokuk 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 50136?
Keswick uses area code 319, from NANPA's telephone records.
What time zone is 50136 in?
50136 uses America/Chicago.
How many people live in 50136?
About 376 people live in ZIP code 50136, in 145 households, at 9.4 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 50136?
$75,625 a year, against $75,059 across Iowa.
What ZIP codes are near 50136?
The closest are 50255 (2.2 mi), 50104 (5.2 mi), 52355 (5.3 mi), 50268 (5.6 mi) and 52222 (7.8 mi).
Is 50136 a PO Box ZIP code?
50136 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “50136 ZIP Code — Keswick, Iowa (Keokuk County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/50136
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/50136.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.