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Where 52231 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 52231 into a pocket calculator and turn it upside down: IEZZS — not quite a word, sorry.
- ➕ As a number, 52,231 = 19 × 2749. Its digits add up to 13, a total 1,179 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100110000000111 - 🏠 Its numerical neighbours: 52229 (Garrison, IA, 55 mi away) and 52232 (Hartwick, IA, 34 mi away).
- 🔄 Backwards, 52231 becomes 13225 — and that is a real ZIP code: Syracuse, NY, 819 miles away.
- 👥 36 other ZIP codes are made of exactly the same digits (12235, 12325, 12523, 13225, 13252, 15223, …). The farthest-flung twin is 32125 in Daytona Beach, FL, 1,043 miles away.
- 🧭 Farther north than 70% of all ZIP codes, and farther west than 61%.
- 🎯358 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 52231 and you would come out at 41.36°S, 87.94°E — 1,018 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 10m of daylight. Shortest: 9h 11m.
- 📏 At 34.5 square miles of land, 52231 is bigger than 49% of ZIP codes — room for about 26 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 539This ZIP539 |
|---|---|
| Households | 197This ZIP197 |
| Housing units | 197This ZIP197 |
| Median age | 39.3This ZIP39.3Iowa38.6US 38.9 |
| Median household income | $90,893This ZIP$90,893Iowa$75,059US $80,734 |
| Median home value | $242,400This ZIP$242,400Iowa$208,000US $332,700 |
| Median gross rent | $1,125This ZIP$1,125Iowa$972US $1,413 |
| Bachelor's degree or higher | 16.5%This ZIP16.5% |
| Mean commute | 19.4 minThis ZIP19.4 min |
| Population density | 15.6 / sq miThis ZIP15.6 / sq mi |
Business and tax activity
| Business establishments | 6This ZIP6 |
|---|---|
| Employees | 26This ZIP26 |
| Annual payroll | $2,108,000This ZIP$2,108,000 |
| Tax returns filed | 180This ZIP180 |
| Total adjusted gross income | $13,016,000This ZIP$13,016,000 |
Land area
| Land area | 34.52 sq miThis ZIP34.52 sq mi |
|---|---|
| Water area | 0.04 sq miThis ZIP0.04 sq mi |
Other place names in 52231
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 52231
| ZIP | City | Distance |
|---|---|---|
52248 | Keota, IA | 6.5 mi |
52591 | Sigourney, IA | 7.5 mi |
52335 | South English, IA | 7.5 mi |
52355 | Webster, IA | 9.9 mi |
52576 | Ollie, IA | 10.3 mi |
52562 | Hayesville, IA | 11.8 mi |
52585 | Richland, IA | 12.3 mi |
52359 | West Chester, IA | 12.9 mi |
52316 | North English, IA | 13.0 mi |
52356 | Wellman, IA | 13.6 mi |
Find every ZIP code within 10 miles of 52231 →
Questions about this ZIP code
Where is ZIP code 52231?
52231 is in Harper, Iowa, in Keokuk County. Its published point location is 41.3588, -92.0586.
What county is 52231 in?
52231 lies in Keokuk County.
What area code is 52231?
Harper uses area code 641, from NANPA's telephone records.
What time zone is 52231 in?
52231 uses America/Chicago.
How many people live in 52231?
About 539 people live in ZIP code 52231, in 197 households, at 15.6 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 52231?
$90,893 a year, against $75,059 across Iowa.
What ZIP codes are near 52231?
The closest are 52248 (6.5 mi), 52591 (7.5 mi), 52335 (7.5 mi), 52355 (9.9 mi) and 52576 (10.3 mi).
Is 52231 a PO Box ZIP code?
52231 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “52231 ZIP Code — Harper, Iowa (Keokuk County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/52231
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/52231.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.