🇺🇸 United States ZIP Code

STANDARD

81101

Alamosa

ZIP Code 81101 is a standard zip code serving Alamosa, Alamosa, Colorado (CO), in Alamosa County, United States. It has an estimated population of 14,675 with a median household income of $33,620. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Colorado (CO)
County: Alamosa
City: Alamosa
Timezone: America/Denver

Coordinates

Latitude: 37.470300
Longitude: -105.878600

Geographic Details

Land Area: 409.37 mi²
Water Area: 0.62 mi²
Population Density: 36.0 people per mi² (30th percentile)
Bounding Box: 37.634386°N, 37.293740°S, -105.485516°E, -106.065291°W

With 14,675 residents spread across 409.37 square miles, this area has a population density of 36.0 people per square mile.

Demographics

14,675

Population

75th percentile

$33,620

Median Income

15th percentile

$137,400

Median Home Value

50th percentile

409.37 mi²

Land Area

The median household income in 81101 is $33,620, and the median home value is $137,400. This is below the national average for household income.

Housing

6,133

Total Units

5,668

Occupied Units

92.4%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Alamosa, CO.

81102

Alamosa

Similar ZIP Codes in Colorado

ZIP codes with similar median household income in Colorado.

80521

Fort Collins

$37,942

81050

La Junta

$37,543

81334

Towaoc

$29,593

81089

Walsenburg

$29,054

81062

Olney Springs

$38,375

80813

Cripple Creek

$37,604

80631

Greeley

$30,235

81154

South Fork

$36,696

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.