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Where 50604 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 50604 into a pocket calculator and turn it upside down: hOgOS — not quite a word, sorry.
- ➕ As a number, 50,604 = 2 × 2 × 3 × 4217. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100010110101100 - 🏠 Its numerical neighbours: 50603 (Alta Vista, IA, 46 mi away) and 50605 (Aredale, IA, 18 mi away).
- 🔄 Backwards, 50604 becomes 40605, which is not a ZIP code at all.
- 👥 27 other ZIP codes are made of exactly the same digits (04056, 04605, 04650, 05046, 05406, 05460, …). The farthest-flung twin is 04605 in Ellsworth, ME, 1,229 miles away.
- 🧭 Farther north than 80% of all ZIP codes, and farther west than 63%.
- 🎯352 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 50604 and you would come out at 42.60°S, 87.10°E — 932 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 19m of daylight. Shortest: 9h 03m.
- 📏 At 71.5 square miles of land, 50604 is bigger than 69% of ZIP codes — room for about 54 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,590This ZIP1,590 |
|---|---|
| Households | 663This ZIP663 |
| Housing units | 737This ZIP737 |
| Median age | 41.3This ZIP41.3Iowa38.6US 38.9 |
| Median household income | $66,776This ZIP$66,776Iowa$75,059US $80,734 |
| Median home value | $168,200This ZIP$168,200Iowa$208,000US $332,700 |
| Median gross rent | $627This ZIP$627Iowa$972US $1,413 |
| Bachelor's degree or higher | 24.8%This ZIP24.8% |
| Mean commute | 24.1 minThis ZIP24.1 min |
| Population density | 22.2 / sq miThis ZIP22.2 / sq mi |
Business and tax activity
| Business establishments | 30This ZIP30 |
|---|---|
| Employees | 245This ZIP245 |
| Annual payroll | $8,068,000This ZIP$8,068,000 |
| Tax returns filed | 760This ZIP760 |
| Total adjusted gross income | $55,048,000This ZIP$55,048,000 |
Land area
| Land area | 71.53 sq miThis ZIP71.53 sq mi |
|---|---|
| Water area | 0.05 sq miThis ZIP0.05 sq mi |
Counties 50604 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Butler County | 79.5% |
| Grundy County | 20.5% |
Other place names in 50604
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 50604
| ZIP | City | Distance |
|---|---|---|
50608 | Austinville, IA | 3.4 mi |
50649 | Kesley, IA | 4.2 mi |
50665 | Parkersburg, IA | 6.5 mi |
50601 | Ackley, IA | 8.6 mi |
50602 | Allison, IA | 10.7 mi |
50673 | Stout, IA | 10.8 mi |
50680 | Wellsburg, IA | 10.9 mi |
50625 | Dumont, IA | 11.2 mi |
50642 | Holland, IA | 11.9 mi |
50633 | Geneva, IA | 12.8 mi |
Find every ZIP code within 10 miles of 50604 →
Questions about this ZIP code
Where is ZIP code 50604?
50604 is in Aplington, Iowa, in Butler County. Its published point location is 42.6018, -92.8965.
What county is 50604 in?
50604 spans 2 counties: Butler County and Grundy County. Most of it falls in Butler 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 50604?
Aplington uses area code 319, from NANPA's telephone records.
What time zone is 50604 in?
50604 uses America/Chicago.
How many people live in 50604?
About 1,590 people live in ZIP code 50604, in 663 households, at 22.2 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 50604?
$66,776 a year, against $75,059 across Iowa.
What ZIP codes are near 50604?
The closest are 50608 (3.4 mi), 50649 (4.2 mi), 50665 (6.5 mi), 50601 (8.6 mi) and 50602 (10.7 mi).
Is 50604 a PO Box ZIP code?
50604 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “50604 ZIP Code — Aplington, Iowa (Butler County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/50604
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/50604.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.