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Where 51446 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 51446 into a pocket calculator and turn it upside down: ghhIS — not quite a word, sorry.
- ➕ As a number, 51,446 = 2 × 29 × 887. Its digits add up to 20, a total 2,586 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100100011110110 - 🏠 Its numerical neighbours: 51445 (Ida Grove, IA, 41 mi away) and 51447 (Kirkman, IA, 4 mi away).
- 🔄 Backwards, 51446 becomes 64415, which is not a ZIP code at all.
- 👥 29 other ZIP codes are made of exactly the same digits (14456, 14546, 14564, 15446, 15464, 15644, …). The farthest-flung twin is 14456 in Geneva, NY, 931 miles away.
- 🧭 Farther north than 73% of all ZIP codes, and farther west than 69%.
- 🎯222 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51446 and you would come out at 41.78°S, 84.81°E — 876 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 13m of daylight. Shortest: 9h 08m.
- 📏 At 35.8 square miles of land, 51446 is bigger than 50% of ZIP codes — room for about 27 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 499This ZIP499 |
|---|---|
| Households | 231This ZIP231 |
| Housing units | 244This ZIP244 |
| Median age | 50.3This ZIP50.3Iowa38.6US 38.9 |
| Median household income | $62,750This ZIP$62,750Iowa$75,059US $80,734 |
| Median home value | $91,400This ZIP$91,400Iowa$208,000US $332,700 |
| Median gross rent | $705This ZIP$705Iowa$972US $1,413 |
| Bachelor's degree or higher | 30.0%This ZIP30.0% |
| Mean commute | 25.0 minThis ZIP25.0 min |
| Population density | 13.9 / sq miThis ZIP13.9 / sq mi |
Business and tax activity
| Business establishments | 18This ZIP18 |
|---|---|
| Employees | 101This ZIP101 |
| Annual payroll | $4,681,000This ZIP$4,681,000 |
| Tax returns filed | 230This ZIP230 |
| Total adjusted gross income | $17,276,000This ZIP$17,276,000 |
Land area
| Land area | 35.78 sq miThis ZIP35.78 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 51446
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51446
| ZIP | City | Distance |
|---|---|---|
51447 | Kirkman, IA | 3.8 mi |
51454 | Manilla, IA | 7.5 mi |
51527 | Defiance, IA | 8.6 mi |
51432 | Aspinwall, IA | 9.6 mi |
51543 | Kimballton, IA | 10.3 mi |
51537 | Harlan, IA | 10.3 mi |
51578 | Westphalia, IA | 11.1 mi |
51455 | Manning, IA | 11.4 mi |
50110 | Gray, IA | 11.6 mi |
51530 | Earling, IA | 12.3 mi |
Find every ZIP code within 10 miles of 51446 →
Questions about this ZIP code
Where is ZIP code 51446?
51446 is in Irwin, Iowa, in Shelby County. Its published point location is 41.7766, -95.1927.
What county is 51446 in?
51446 lies in Shelby County.
What area code is 51446?
Irwin uses area code 712, from NANPA's telephone records.
What time zone is 51446 in?
51446 uses America/Chicago.
How many people live in 51446?
About 499 people live in ZIP code 51446, in 231 households, at 13.9 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 51446?
$62,750 a year, against $75,059 across Iowa.
What ZIP codes are near 51446?
The closest are 51447 (3.8 mi), 51454 (7.5 mi), 51527 (8.6 mi), 51432 (9.6 mi) and 51543 (10.3 mi).
Is 51446 a PO Box ZIP code?
51446 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51446 ZIP Code — Irwin, Iowa (Shelby County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51446
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51446.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.