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Where 57638 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 57638 into a pocket calculator and turn it upside down: BEgLS — not quite a word, sorry.
- ➕ As a number, 57,638 = 2 × 7 × 23 × 179. Its digits add up to 29, a total 1,296 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110000100100110 - 🏠 Its numerical neighbours: 57636 (Lantry, SD, 69 mi away) and 57639 (Little Eagle, SD, 70 mi away).
- 🔄 Backwards, 57638 becomes 83675, which is not a ZIP code at all.
- 👥 53 other ZIP codes are made of exactly the same digits (35768, 36578, 36587, 36758, 36785, 36875, …). The farthest-flung twin is 78536 in Delmita, TX, 1,345 miles away.
- 🧭 Farther north than 93% of all ZIP codes, and farther west than 81%.
- 🎯456 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 57638 and you would come out at 45.87°S, 77.77°E — 426 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 44m of daylight. Shortest: 8h 39m.
- 📏 At 1,012.4 square miles of land, 57638 is bigger than 99% of ZIP codes — room for about 769 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,852This ZIP1,852 |
|---|---|
| Households | 811This ZIP811 |
| Housing units | 1,096This ZIP1,096 |
| Median age | 47.1This ZIP47.1South Dakota38.0US 38.9 |
| Median household income | $58,533This ZIP$58,533South Dakota$75,081US $80,734 |
| Median home value | $101,100This ZIP$101,100South Dakota$257,400US $332,700 |
| Median gross rent | $663This ZIP$663South Dakota$946US $1,413 |
| Bachelor's degree or higher | 25.1%This ZIP25.1% |
| Mean commute | 13.1 minThis ZIP13.1 min |
| Population density | 1.8 / sq miThis ZIP1.8 / sq mi |
Business and tax activity
| Business establishments | 81This ZIP81 |
|---|---|
| Employees | 584This ZIP584 |
| Annual payroll | $21,125,000This ZIP$21,125,000 |
| Tax returns filed | 710This ZIP710 |
| Total adjusted gross income | $45,560,000This ZIP$45,560,000 |
Land area
| Land area | 1,012.37 sq miThis ZIP1,012.37 sq mi |
|---|---|
| Water area | 10.42 sq miThis ZIP10.42 sq mi |
Counties 57638 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Perkins County | 60.2% |
| Adams County | 25.3% |
| Grant County | 5.1% |
| Sioux County | 4.7% |
| Corson County | 4.7% |
Other place names in 57638
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 57638
| ZIP | City | Distance |
|---|---|---|
57634 | Keldron, SD | 18.9 mi |
57640 | Lodgepole, SD | 23.8 mi |
58639 | Hettinger, ND | 24.3 mi |
57645 | Morristown, SD | 24.9 mi |
57644 | Meadow, SD | 27.9 mi |
57660 | Watauga, SD | 33.8 mi |
58562 | New Leipzig, ND | 35.6 mi |
58646 | Mott, ND | 36.2 mi |
57620 | Bison, SD | 37.2 mi |
58649 | Reeder, ND | 37.2 mi |
Find every ZIP code within 10 miles of 57638 →
Questions about this ZIP code
Where is ZIP code 57638?
57638 is in Lemmon, South Dakota, in Perkins County. Its published point location is 45.8699, -102.2321.
What county is 57638 in?
57638 spans 5 counties: Perkins County, Adams County, Grant County, Sioux County and Corson County. Most of it falls in Perkins 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 57638?
Lemmon uses area code 605, from NANPA's telephone records.
What time zone is 57638 in?
57638 uses America/Denver.
How many people live in 57638?
About 1,852 people live in ZIP code 57638, in 811 households, at 1.8 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 57638?
$58,533 a year, against $75,081 across South Dakota.
What ZIP codes are near 57638?
The closest are 57634 (18.9 mi), 57640 (23.8 mi), 58639 (24.3 mi), 57645 (24.9 mi) and 57644 (27.9 mi).
Is 57638 a PO Box ZIP code?
57638 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “57638 ZIP Code — Lemmon, South Dakota (Perkins County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/57638
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/57638.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.