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Where 57630 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 57630 into a pocket calculator and turn it upside down: OEgLS — not quite a word, sorry.
- ➕ As a number, 57,630 = 2 × 3 × 5 × 17 × 113. Its digits add up to 21, a total 2,594 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110000100011110 - 🏠 Its numerical neighbours: 57626 (Faith, SD, 69 mi away) and 57631 (Glenham, SD, 32 mi away).
- 🔄 Backwards, 57630 becomes 03675, which is not a ZIP code at all.
- 👥 59 other ZIP codes are made of exactly the same digits (03576, 03756, 03765, 05673, 05736, 05763, …). The farthest-flung twin is 06375 in Quaker Hill, CT, 1,460 miles away.
- 🧭 Farther north than 92% of all ZIP codes, and farther west than 80%.
- 🎯397 miles north of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 57630 and you would come out at 45.33°S, 79.16°E — 502 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 40m of daylight. Shortest: 8h 43m.
- 📏 At 110.0 square miles of land, 57630 is bigger than 80% of ZIP codes — room for about 83 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 11This ZIP11 |
|---|---|
| Households | 9This ZIP9 |
| Housing units | 12This ZIP12 |
| Median age | 64.2This ZIP64.2South Dakota38.0US 38.9 |
| Bachelor's degree or higher | 0.0% |
| Population density | 0.1 / sq miThis ZIP0.1 / sq mi |
Land area
| Land area | 109.98 sq miThis ZIP109.98 sq mi |
|---|---|
| Water area | 0.16 sq miThis ZIP0.16 sq mi |
Other place names in 57630
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 57630
| ZIP | City | Distance |
|---|---|---|
57661 | Whitehorse, SD | 8.0 mi |
57657 | Trail City, SD | 13.0 mi |
57656 | Timber Lake, SD | 14.2 mi |
57652 | Ridgeview, SD | 15.7 mi |
57601 | Mobridge, SD | 23.3 mi |
57639 | Little Eagle, SD | 23.9 mi |
57625 | Eagle Butte, SD | 26.1 mi |
57658 | Wakpala, SD | 26.9 mi |
57631 | Glenham, SD | 31.9 mi |
57642 | Mc Laughlin, SD | 32.2 mi |
Find every ZIP code within 10 miles of 57630 →
Questions about this ZIP code
Where is ZIP code 57630?
57630 is in Glencross, South Dakota, in Dewey County. Its published point location is 45.3338, -100.8440.
What county is 57630 in?
57630 lies in Dewey County.
What area code is 57630?
Glencross uses area code 605, from NANPA's telephone records.
What time zone is 57630 in?
57630 uses America/Denver.
How many people live in 57630?
About 11 people live in ZIP code 57630, in 9 households, at 0.1 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 57630?
The closest are 57661 (8 mi), 57657 (13 mi), 57656 (14.2 mi), 57652 (15.7 mi) and 57601 (23.3 mi).
Is 57630 a PO Box ZIP code?
57630 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “57630 ZIP Code — Glencross, South Dakota (Dewey County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/57630
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/57630.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.