81138
ZIP 81138 is Jaroso, Colorado, in Costilla County; area code 719; Mountain time.
- Type
- Standard
- Time zone
- America/Denver
- County
- Costilla
- Metro area
- Alamosa, CO
- Population
- 17
- Coordinates
- 37.0230, -105.6274
Weather right now
Asking the National Weather Service…
Where 81138 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 81138 into a pocket calculator and turn it upside down: BEIIB — not quite a word, sorry.
- ➕ As a number, 81,138 = 2 × 3 × 13523. Its digits add up to 21, a total 2,594 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011110011110010 - 🏠 Its numerical neighbours: 81137 (Ignacio, CO, 110 mi away) and 81140 (La Jara, CO, 35 mi away).
- 🔄 Backwards, 81138 becomes 83118 — and that is a real ZIP code: Etna, WY, 502 miles away.
- 👥 8 other ZIP codes are made of exactly the same digits (18813, 18831, 38118, 38181, 83118, 83811, …). The farthest-flung twin is 18813 in Brooklyn, PA, 1,617 miles away.
- 🧭 Farther south than 64% of all ZIP codes, and farther west than 83%.
- 🎯428 miles southwest of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 81138 and you would come out at 37.02°S, 74.37°E — 877 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 42m of daylight. Shortest: 9h 37m.
- 📏 At 20.1 square miles of land, 81138 is bigger than 37% of ZIP codes — room for about 15 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 17This ZIP17 |
|---|---|
| Households | 17This ZIP17 |
| Housing units | 26This ZIP26 |
| Bachelor's degree or higher | 0.0% |
| Population density | 0.8 / sq miThis ZIP0.8 / sq mi |
Land area
| Land area | 20.10 sq miThis ZIP20.10 sq mi |
|---|---|
| Water area | 0.00 sq mi |
ZIP codes near 81138
| ZIP | City | Distance |
|---|---|---|
87524 | Costilla, NM | 6.2 mi |
81152 | San Luis, CO | 14.9 mi |
87556 | Questa, NM | 15.1 mi |
81151 | Sanford, CO | 15.6 mi |
87512 | Amalia, NM | 17.1 mi |
81141 | Manassa, CO | 17.5 mi |
87519 | Cerro, NM | 17.9 mi |
81126 | Chama, CO | 18.2 mi |
81148 | Romeo, CO | 22.2 mi |
81129 | Conejos, CO | 22.5 mi |
Find every ZIP code within 10 miles of 81138 →
Questions about this ZIP code
Where is ZIP code 81138?
81138 is in Jaroso, Colorado, in Costilla County, part of the Alamosa, CO micropolitan area. Its published point location is 37.0230, -105.6274.
What county is 81138 in?
81138 lies in Costilla County.
What area code is 81138?
Jaroso uses area code 719, from NANPA's telephone records.
What time zone is 81138 in?
81138 uses America/Denver.
How many people live in 81138?
About 17 people live in ZIP code 81138, in 17 households, at 0.8 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 81138?
The closest are 87524 (6.2 mi), 81152 (14.9 mi), 87556 (15.1 mi), 81151 (15.6 mi) and 87512 (17.1 mi).
Is 81138 a PO Box ZIP code?
81138 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “81138 ZIP Code — Jaroso, Colorado (Costilla County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/81138
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/81138.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.