Data Last Updated: July 1, 2025

Costilla County, CO ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Costilla, CO.	6 ZIP Codes (3 General, 2 PO Box, 0 Unique, & 1 Multi County) [More Details]
Area Code: The Telephone Area Code that are associated with Costilla, CO. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	719
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Mountain
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Costilla, CO from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	3,499 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	08023
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	Alamosa, CO
Land Area: The approximate amount of land area covered by Costilla, CO in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	1,228 square miles
Water Area: The approximate amount of water area covered by Costilla, CO in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	3 square miles
Coordinates: The latitude/longitude centroid coordinates for Costilla County, CO.	-105.428221, 37.278098
Quick Link: Copy the direct link to the Costilla, COCounty page and use anywhere you like!	https://www.zip-codes.com/county/co-costilla.asp

Costilla, CO ZIP Code Boundaries

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Costilla County, CO Covers 6 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 81123	General	Blanca	727	20.78%
ZIP Code 81126	P.O. Box	Chama	239	6.83%
ZIP Code 81133	General	Fort Garland	1,009	28.84%
ZIP Code 81138	P.O. Box	Jaroso	62	1.77%
ZIP Code 81151 *	General	Sanford	1,527	--
ZIP Code 81152	General	San Luis	1,294	36.98%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Costilla, CO, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Costilla, CO Information

Costilla County, CO Covers 6 ZIP Codes. This includes 3 General ZIP Codes, 2 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There is also 1 Multi County ZIP Code in this area. This record is assigned to a different county, but it does partially cover area in Costilla County.

The population for Costilla County is 3,499, according to the U.S. Census. Population Density is 2.85 persons per square mile. With 2,423 Housing Units, the Average Household Size is 2.19 persons. There are 1,594 Family Households with an Average Family Size of 3.19 persons. 7.16% of the population is without Health Insurance. The 41.77% Employment Rate is 18.03% above the national average of 59.8%.2,686 people aged 25+ have some educational achievement, with 27.85% (or 748 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

719 is the only area code for this area. Costilla is also located in the Mountain timezone and the current local time is shown above.

Costilla is part of the Alamosa, CO Core Based Statistical Area (CBSA). Its CBSA Code is 10480.It is classified as a micro area, which means it has an urban core of at least 10,000 but less then 50,000 people.

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Costilla, CO have 775 Residential mailboxes and 11 Business mailboxes.There are 43 businesses with a total of 319 employees. That is an average of 7.4 employees per business. Annual payroll for these businesses is $12,105,000. Other Demographics

Costilla County Demographic Profile

Population & People

Total Population

3,499

Income

Median Household Income

$36,519

Housing

Total Housing Units

2,423

Health

Without Healthcare Coverage

7.16%

Business & Economy

Total Businesses

Families

Total Households

1,594

Employment

Employment Rate

41.77%

Education

Bachelor's Degree or Higher

27.85%

Total Population: Total number of people from the 2020 U.S. Census for Costilla, CO. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	3,499
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Costilla, CO. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	1,663
Total Households: Total number of Households from the 2020 U.S. Census for Costilla, CO. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	1,594
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	2,423
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.19
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	3.19

Other Costilla Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	775
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	11
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	5,487
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	353
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	0

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	43
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$2,591,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$12,105,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	319

Sum of all ZIP Codes assigned Costilla, CO as their primary County.

References

U.S. Postal Service [Last Updated: 7/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 7/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov