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Zip Code 81101 — Alamosa, CO

ZIP Code 81101 is associated with Alamosa, CO, in Alamosa County. The listed population estimate is 15,550; estimated density is 16.3 people per square mile. Among records with population estimates, it ranks #1 of 3 in Alamosa County and #147 of 512 in CO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (37.471970, -105.852430)

Data MetricLocal Statistic
Postal / Zip Code81101
Primary CityAlamosa
State / ProvinceCO
CountyAlamosa
Total Population15,550
Population Density16.3 people/sq mi
TimezoneAmerica/Denver

How 81101 Compares

MetricZIP 81101Alamosa County recordsCO records
Population estimate15,55016,492 (sum)5,862,421 (sum)
Population Density16.3 /sq mi----
County population rank#1 of 3----
State population rank#147 of 512----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in CO

ZIP CodeCityDistancePopulation estimate
ZIP 81146Mosca15.4 mi637
ZIP 81123Blanca16.4 mi606
ZIP 81144Monte Vista17.1 mi6,543
ZIP 81136Hooper17.6 mi305
ZIP 81151Sanford18.1 mi1,716

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →