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Where 51201 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 51201 into a pocket calculator and turn it upside down: IOZIS — not quite a word, sorry.
- ➕ As a number, 51,201 = 3 × 3 × 5689. Its digits add up to 9, a total 375 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100100000000001 - 🏠 Its numerical neighbours: 51111 (Sioux City, IA, 59 mi away) and 51230 (Alvord, IA, 26 mi away).
- 🔄 Backwards, 51201 becomes 10215, which is not a ZIP code at all.
- 👥 37 other ZIP codes are made of exactly the same digits (01152, 01521, 02115, 02151, 10125, 10152, …). The farthest-flung twin is 02151 in Revere, MA, 1,257 miles away.
- 🧭 Farther north than 84% of all ZIP codes, and farther west than 71%.
- 🎯271 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51201 and you would come out at 43.18°S, 84.13°E — 788 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 23m of daylight. Shortest: 8h 59m.
- 📏 At 115.7 square miles of land, 51201 is bigger than 81% of ZIP codes — room for about 88 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 6,430This ZIP6,430 |
|---|---|
| Households | 2,550This ZIP2,550 |
| Housing units | 2,948This ZIP2,948 |
| Median age | 37.9This ZIP37.9Iowa38.6US 38.9 |
| Median household income | $68,799This ZIP$68,799Iowa$75,059US $80,734 |
| Median home value | $197,800This ZIP$197,800Iowa$208,000US $332,700 |
| Median gross rent | $930This ZIP$930Iowa$972US $1,413 |
| Bachelor's degree or higher | 21.8%This ZIP21.8% |
| Mean commute | 16.1 minThis ZIP16.1 min |
| Population density | 55.6 / sq miThis ZIP55.6 / sq mi |
Business and tax activity
| Business establishments | 243This ZIP243 |
|---|---|
| Employees | 3,990This ZIP3,990 |
| Annual payroll | $185,085,000This ZIP$185,085,000 |
| Tax returns filed | 2,770This ZIP2,770 |
| Total adjusted gross income | $243,581,000This ZIP$243,581,000 |
Land area
| Land area | 115.66 sq miThis ZIP115.66 sq mi |
|---|---|
| Water area | 0.03 sq miThis ZIP0.03 sq mi |
Counties 51201 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Sioux County | 49.2% |
| O'Brien County | 48.6% |
| Lyon County | 2.2% |
Other place names in 51201
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51201
| ZIP | City | Distance |
|---|---|---|
51244 | Matlock, IA | 5.5 mi |
51238 | Hospers, IA | 7.6 mi |
51234 | Boyden, IA | 7.8 mi |
51231 | Archer, IA | 8.2 mi |
51232 | Ashton, IA | 8.3 mi |
51248 | Sanborn, IA | 10.5 mi |
51237 | George, IA | 12.6 mi |
51022 | Granville, IA | 14.1 mi |
51239 | Hull, IA | 14.3 mi |
51003 | Alton, IA | 14.6 mi |
Find every ZIP code within 10 miles of 51201 →
Questions about this ZIP code
Where is ZIP code 51201?
51201 is in Sheldon, Iowa, in Sioux County. Its published point location is 43.1824, -95.8656.
What county is 51201 in?
51201 spans 3 counties: Sioux County, O'Brien County and Lyon County. Most of it falls in Sioux 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 51201?
Sheldon uses area code 712, from NANPA's telephone records.
What time zone is 51201 in?
51201 uses America/Chicago.
How many people live in 51201?
About 6,430 people live in ZIP code 51201, in 2,550 households, at 55.6 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 51201?
$68,799 a year, against $75,059 across Iowa.
What ZIP codes are near 51201?
The closest are 51244 (5.5 mi), 51238 (7.6 mi), 51234 (7.8 mi), 51231 (8.2 mi) and 51232 (8.3 mi).
Is 51201 a PO Box ZIP code?
51201 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51201 ZIP Code — Sheldon, Iowa (Sioux County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51201
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51201.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.