Find the last 4 digits (ZIP+4) for an address in 81101

ZIP 81101, Alamosa, CO is filled in. Just type the street address.

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ZIP Code 81101 – Alamosa, CO

Alamosa, Colorado · Alamosa County · Mountain time

ZIP code81101
CityAlamosa
StateColorado
CountyAlamosa CountyConejos County
Population15,550
Time zoneMountain · local time
ZIP typeStandard (has a Census ZCTA area)
Land area369 sq mi
Center (lat, long)37.4693, -105.8527

Area codes in this area

719

These are the area codes that most often serve ZIP 81101 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

81102 Alamosa · 1.7 mi81135 Homelake · 15.3 mi81146 Mosca · 15.8 mi81123 Blanca · 16.2 mi81144 Monte Vista · 16.7 mi81136 Hooper · 17.4 mi81151 Sanford · 17.7 mi81124 Capulin · 18.8 mi

About ZIP 81101

ZIP code 81101 is assigned to Alamosa, Colorado. It crosses 2 counties; most of its land is in Alamosa County. Its Census area covers about 369 square miles of land. The closest neighboring ZIP is 81102 (Alamosa), about 1.7 miles away.

Every address in 81101 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources