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County ZIP codes · Colorado · FIPS 08023

Costilla County, CO ZIP Codes

Costilla County, Colorado has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 6 of the residential ones lie mainly in Costilla County and 1 mainly in a neighboring county; 2 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Costilla County?

81055 · La Veta: $55k81123 · Blanca: $37k81126 · Chama: $53k81133 · Fort Garland: $46k81138 · Jaroso: –81151 · Sanford: $43k81152 · San Luis: $32k8115281133810558115181123811268113881055 · La Veta: $55k81123 · Blanca: $37k81126 · Chama: $53k81133 · Fort Garland: $46k81138 · Jaroso: –81151 · Sanford: $43k81152 · San Luis: $32k8115281133810558115181123811268113881055 · La Veta: $55k81123 · Blanca: $37k81126 · Chama: $53k81133 · Fort Garland: $46k81138 · Jaroso: –81151 · Sanford: $43k81152 · San Luis: $32k8115281133810558115181123
The residential ZIP codes of Costilla County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

All 7 residential ZIP codes in Costilla County

6 ZIP codes lie mainly in Costilla County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Costilla County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
81151 Sanford 1,716 6 $43k $189k 57%
81152 San Luis 1,244 3 $32k $120k 100%
81133 Fort Garland 1,085 3 $46k $273k 100%
81123 Blanca 606 4 $37k $152k 100%
81126 Chama 506 51 $53k $170k 100%
81138 Jaroso 17 1 – – 100%

Partly in Costilla County

Residential ZIP codes mainly in another county that reach at least 1% into Costilla County, by their share here
In this county
81055 La Veta 1,559 6 $55k $399k 1%

Download the 7 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

2 ZIP codes of Costilla County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Costilla County and in the neighboring counties
ZIPIn CostillaElsewhere
8115157%Conejos County 43%
810551%Huerfano County 99%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Costilla County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Costilla County's ZIP codes use 2 prefixes: 810 and 811.

Three-digit prefixes of Costilla County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Costilla County's
PrefixSectional centerHereAll codes
810 Colorado Springs, CO (SCF 808) 1 59
811 Colorado Springs, CO (SCF 808) 6 32

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.