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Where 87931 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 87931 into a pocket calculator and turn it upside down: IEGLB — not quite a word, sorry.
- ➕ 87931 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 28, a total 1,520 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10101011101111011 - 🏠 Its numerical neighbours: 87930 (Arrey, NM, 7 mi away) and 87933 (Derry, NM, 10 mi away).
- 🔄 Backwards, 87931 becomes 13978, which is not a ZIP code at all.
- 👥 30 other ZIP codes are made of exactly the same digits (17938, 17983, 31789, 31798, 37189, 37819, …). The farthest-flung twin is 17938 in Hegins, PA, 1,778 miles away.
- 🧭 Farther south than 84% of all ZIP codes, and farther west than 85%.
- 🎯681 miles southwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 87931 and you would come out at 32.92°S, 72.66°E — 1,142 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 19m of daylight. Shortest: 9h 59m.
- 📏 At 166.7 square miles of land, 87931 is bigger than 88% of ZIP codes — room for about 127 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 703This ZIP703 |
|---|---|
| Households | 406This ZIP406 |
| Housing units | 489This ZIP489 |
| Median age | 71.6This ZIP71.6New Mexico39.4US 38.9 |
| Bachelor's degree or higher | 16.2%This ZIP16.2% |
| Population density | 4.2 / sq miThis ZIP4.2 / sq mi |
Business and tax activity
| Business establishments | 6This ZIP6 |
|---|---|
| Employees | 165This ZIP165 |
| Annual payroll | $10,082,000This ZIP$10,082,000 |
| Tax returns filed | 240This ZIP240 |
| Total adjusted gross income | $13,524,000This ZIP$13,524,000 |
Land area
| Land area | 166.70 sq miThis ZIP166.70 sq mi |
|---|---|
| Water area | 6.64 sq miThis ZIP6.64 sq mi |
Other place names in 87931
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 87931
| ZIP | City | Distance |
|---|---|---|
87930 | Arrey, NM | 6.7 mi |
87942 | Williamsburg, NM | 9.5 mi |
87933 | Derry, NM | 9.9 mi |
87936 | Garfield, NM | 12.8 mi |
88042 | Hillsboro, NM | 15.0 mi |
87941 | Salem, NM | 16.8 mi |
87654 | Spaceport City, NM | 22.2 mi |
87935 | Elephant Butte, NM | 23.8 mi |
87937 | Hatch, NM | 24.6 mi |
87901 | Truth Or Consequences, NM | 25.1 mi |
Find every ZIP code within 10 miles of 87931 →
Questions about this ZIP code
Where is ZIP code 87931?
87931 is in Caballo, New Mexico, in Sierra County. Its published point location is 32.9239, -107.3442.
What county is 87931 in?
87931 lies in Sierra County.
What area code is 87931?
Caballo uses area code 575, from NANPA's telephone records.
What time zone is 87931 in?
87931 uses America/Denver.
How many people live in 87931?
About 703 people live in ZIP code 87931, in 406 households, at 4.2 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 87931?
The closest are 87930 (6.7 mi), 87942 (9.5 mi), 87933 (9.9 mi), 87936 (12.8 mi) and 88042 (15 mi).
Is 87931 a PO Box ZIP code?
87931 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “87931 ZIP Code — Caballo, New Mexico (Sierra County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/87931
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/87931.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.