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Where 57640 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 57640 into a pocket calculator and turn it upside down: OhgLS — not quite a word, sorry.
- ➕ As a number, 57,640 = 2 × 2 × 2 × 5 × 11 × 131. Its digits add up to 22, a total 2,607 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110000100101000 - 🏠 Its numerical neighbours: 57639 (Little Eagle, SD, 92 mi away) and 57641 (Mc Intosh, SD, 68 mi away).
- 🔄 Backwards, 57640 becomes 04675 — and that is a real ZIP code: Seal Harbor, ME, 1,673 miles away.
- 👥 70 other ZIP codes are made of exactly the same digits (04576, 04657, 04675, 04756, 04765, 05476, …). The farthest-flung twin is 04657 in Meddybemps, ME, 1,698 miles away.
- 🧭 Farther north than 93% of all ZIP codes, and farther west than 81%.
- 🎯460 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 57640 and you would come out at 45.77°S, 77.30°E — 412 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 43m of daylight. Shortest: 8h 40m.
- 📏 At 255.1 square miles of land, 57640 is bigger than 93% of ZIP codes — room for about 194 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 41This ZIP41 |
|---|---|
| Households | 30This ZIP30 |
| Housing units | 30This ZIP30 |
| Median age | 55.1This ZIP55.1South Dakota38.0US 38.9 |
| Median household income | $250,000+This ZIP$250,000+South Dakota$75,081US $80,734 |
| Median home value | $337,500This ZIP$337,500South Dakota$257,400US $332,700 |
| Bachelor's degree or higher | 48.8%This ZIP48.8% |
| Population density | 0.2 / sq miThis ZIP0.2 / sq mi |
Land area
| Land area | 255.05 sq miThis ZIP255.05 sq mi |
|---|---|
| Water area | 0.54 sq miThis ZIP0.54 sq mi |
ZIP codes near 57640
| ZIP | City | Distance |
|---|---|---|
57650 | Ralph, SD | 16.5 mi |
57649 | Prairie City, SD | 20.6 mi |
58639 | Hettinger, ND | 20.7 mi |
57638 | Lemmon, SD | 23.8 mi |
57651 | Reva, SD | 25.7 mi |
58649 | Reeder, ND | 27.3 mi |
57620 | Bison, SD | 28.2 mi |
58653 | Scranton, ND | 30.2 mi |
57755 | Ludlow, SD | 31.7 mi |
57644 | Meadow, SD | 35.7 mi |
Find every ZIP code within 10 miles of 57640 →
Questions about this ZIP code
Where is ZIP code 57640?
57640 is in Lodgepole, South Dakota, in Perkins County. Its published point location is 45.7688, -102.7045.
What county is 57640 in?
57640 lies in Perkins County.
What time zone is 57640 in?
57640 uses America/Denver.
How many people live in 57640?
About 41 people live in ZIP code 57640, in 30 households, at 0.2 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 57640?
$250,000+ a year, against $75,081 across South Dakota.
What ZIP codes are near 57640?
The closest are 57650 (16.5 mi), 57649 (20.6 mi), 58639 (20.7 mi), 57638 (23.8 mi) and 57651 (25.7 mi).
Is 57640 a PO Box ZIP code?
57640 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “57640 ZIP Code — Lodgepole, South Dakota (Perkins County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/57640
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/57640.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.