Alamillo is a community in Socorro County, New Mexico, home to about 247 people across 1.2 square miles. Its ZIP code is 87831.
Homes sold for a median of $164 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Alamillo; also San Acacia
Each card is that ZIP code’s whole market, including any part outside Alamillo. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Albuquerque International Sunport (ABQ)59 miles away |
|---|---|
| Nearest city of 250,000+ | Albuquerque, NM62 miles away |
| Nearest city of 1 million+ | Phoenix, AZ301 miles away |
Straight-line distances from the center of Alamillo; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Alamillo had 124 residents in the 2020 census, up 22% since 2010.
It’s the 339th largest of 494 towns in New Mexico by population.
Socorro County grew from 12,195 residents in 1900 to 16,595 in 2020.
Socorro County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 94°F in summer, and winter lows average 22°F. About 8.6 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Socorro 20 N, NM weather station (9 miles away).
2,772 jobs at 221 businesses in Socorro County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
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Shares ZIP codes with San Acacia.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.