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Where 51235 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 51235 into a pocket calculator and turn it upside down: SEZIS — not quite a word, sorry.
- ➕ As a number, 51,235 = 5 × 10247. Its digits add up to 16, a total 1,922 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100100000100011 - 🏠 Its numerical neighbours: 51234 (Boyden, IA, 12 mi away) and 51237 (George, IA, 11 mi away).
- 🔄 Backwards, 51235 becomes 53215 — and that is a real ZIP code: Milwaukee, WI, 417 miles away.
- 👥 28 other ZIP codes are made of exactly the same digits (12553, 15235, 15253, 15325, 15352, 15532, …). The farthest-flung twin is 31525 in Brunswick, GA, 1,153 miles away.
- 🧭 Farther north than 84% of all ZIP codes, and farther west than 72%.
- 🎯269 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51235 and you would come out at 43.29°S, 83.78°E — 769 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 24m of daylight. Shortest: 8h 58m.
- 📏 At 53.5 square miles of land, 51235 is bigger than 61% of ZIP codes — room for about 41 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,007This ZIP1,007 |
|---|---|
| Households | 411This ZIP411 |
| Housing units | 411This ZIP411 |
| Median age | 37.1This ZIP37.1Iowa38.6US 38.9 |
| Median household income | $71,016This ZIP$71,016Iowa$75,059US $80,734 |
| Median home value | $240,700This ZIP$240,700Iowa$208,000US $332,700 |
| Median gross rent | $531This ZIP$531Iowa$972US $1,413 |
| Bachelor's degree or higher | 7.6%This ZIP7.6% |
| Mean commute | 13.8 minThis ZIP13.8 min |
| Population density | 18.8 / sq miThis ZIP18.8 / sq mi |
Business and tax activity
| Business establishments | 44This ZIP44 |
|---|---|
| Employees | 178This ZIP178 |
| Annual payroll | $8,855,000This ZIP$8,855,000 |
| Tax returns filed | 470This ZIP470 |
| Total adjusted gross income | $40,771,000This ZIP$40,771,000 |
Land area
| Land area | 53.50 sq miThis ZIP53.50 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Counties 51235 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Lyon County | 96.9% |
| Sioux County | 3.1% |
Other place names in 51235
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51235
| ZIP | City | Distance |
|---|---|---|
51230 | Alvord, IA | 6.8 mi |
51239 | Hull, IA | 7.2 mi |
51247 | Rock Valley, IA | 9.3 mi |
51246 | Rock Rapids, IA | 9.6 mi |
51237 | George, IA | 11.2 mi |
51242 | Lester, IA | 11.3 mi |
51234 | Boyden, IA | 12.2 mi |
51240 | Inwood, IA | 12.3 mi |
51250 | Sioux Center, IA | 14.1 mi |
51244 | Matlock, IA | 14.6 mi |
Find every ZIP code within 10 miles of 51235 →
Questions about this ZIP code
Where is ZIP code 51235?
51235 is in Doon, Iowa, in Lyon County. Its published point location is 43.2949, -96.2153.
What county is 51235 in?
51235 spans 2 counties: Lyon County and Sioux County. Most of it falls in Lyon 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 51235?
Doon uses area code 712, from NANPA's telephone records.
What time zone is 51235 in?
51235 uses America/Chicago.
How many people live in 51235?
About 1,007 people live in ZIP code 51235, in 411 households, at 18.8 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 51235?
$71,016 a year, against $75,059 across Iowa.
What ZIP codes are near 51235?
The closest are 51230 (6.8 mi), 51239 (7.2 mi), 51247 (9.3 mi), 51246 (9.6 mi) and 51237 (11.2 mi).
Is 51235 a PO Box ZIP code?
51235 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51235 ZIP Code — Doon, Iowa (Lyon County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51235
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51235.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.