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Where 57233 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 57233 into a pocket calculator and turn it upside down: EEZLS — not quite a word, sorry.
- ➕ As a number, 57,233 = 11 × 11 × 11 × 43. Its digits add up to 20, a total 2,586 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1101111110010001 - 🏠 Its numerical neighbours: 57232 (Eden, SD, 77 mi away) and 57234 (Estelline, SD, 26 mi away).
- 🔄 Backwards, 57233 becomes 33275, which is not a ZIP code at all.
- 👥 25 other ZIP codes are made of exactly the same digits (23357, 25337, 27533, 32357, 32537, 32735, …). The farthest-flung twin is 33257 in Miami, FL, 1,612 miles away.
- 🧭 Farther north than 89% of all ZIP codes, and farther west than 75%.
- 🎯329 miles north of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 57233 and you would come out at 44.51°S, 82.60°E — 672 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 33m of daylight. Shortest: 8h 49m.
- 📏 At 36.7 square miles of land, 57233 is bigger than 51% of ZIP codes — room for about 28 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 350This ZIP350 |
|---|---|
| Households | 57This ZIP57 |
| Housing units | 71This ZIP71 |
| Median age | 15.4This ZIP15.4South Dakota38.0US 38.9 |
| Median household income | $82,917This ZIP$82,917South Dakota$75,081US $80,734 |
| Bachelor's degree or higher | 5.2%This ZIP5.2% |
| Mean commute | 22.0 minThis ZIP22.0 min |
| Population density | 9.5 / sq miThis ZIP9.5 / sq mi |
Land area
| Land area | 36.73 sq miThis ZIP36.73 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 57233
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 57233
| ZIP | City | Distance |
|---|---|---|
57221 | Bryant, SD | 7.1 mi |
57249 | Lake Preston, SD | 8.9 mi |
57214 | Badger, SD | 10.3 mi |
57248 | Lake Norden, SD | 11.6 mi |
57231 | De Smet, SD | 12.9 mi |
57241 | Hayti, SD | 15.7 mi |
57212 | Arlington, SD | 15.7 mi |
57278 | Willow Lake, SD | 16.9 mi |
57242 | Hazel, SD | 18.4 mi |
57271 | Vienna, SD | 18.5 mi |
Find every ZIP code within 10 miles of 57233 →
Questions about this ZIP code
Where is ZIP code 57233?
57233 is in Erwin, South Dakota, in Kingsbury County. Its published point location is 44.5099, -97.3993.
What county is 57233 in?
57233 lies in Kingsbury County.
What area code is 57233?
Erwin uses area code 605, from NANPA's telephone records.
What time zone is 57233 in?
57233 uses America/Chicago.
How many people live in 57233?
About 350 people live in ZIP code 57233, in 57 households, at 9.5 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 57233?
$82,917 a year, against $75,081 across South Dakota.
What ZIP codes are near 57233?
The closest are 57221 (7.1 mi), 57249 (8.9 mi), 57214 (10.3 mi), 57248 (11.6 mi) and 57231 (12.9 mi).
Is 57233 a PO Box ZIP code?
57233 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “57233 ZIP Code — Erwin, South Dakota (Kingsbury County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/57233
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/57233.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.