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Zip Code 81123 — Blanca, CO

ZIP Code 81123 is associated with Blanca, CO, in Costilla County. The listed population estimate is 606; estimated density is 1.6 people per square mile. Among records with population estimates, it ranks #4 of 6 in Costilla County and #383 of 512 in CO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (37.404690, -105.565900)

Data MetricLocal Statistic
Postal / Zip Code81123
Primary CityBlanca
State / ProvinceCO
CountyCostilla
Total Population606
Population Density1.6 people/sq mi
TimezoneAmerica/Denver

How 81123 Compares

MetricZIP 81123Costilla County recordsCO records
Population estimate6065,174 (sum)5,862,421 (sum)
Population Density1.6 /sq mi----
County population rank#4 of 6----
State population rank#383 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 81133Fort Garland13.4 mi1,085
ZIP 81151Sanford14.4 mi1,716
ZIP 81101Alamosa16.4 mi15,550
ZIP 81146Mosca17.8 mi637
ZIP 81126Chama20.7 mi506

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 →