🇺🇸 United States ZIP Code

STANDARD

80503

Longmont

ZIP Code 80503 is a standard zip code serving Longmont, Longmont, Colorado (CO), in Boulder County, United States. It has an estimated population of 31,064 with a median household income of $77,631. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 40.155900
Longitude: -105.162400

Geographic Details

Land Area: 91.07 mi²
Water Area: 3.07 mi²
Population Density: 341.0 people per mi² (65th percentile)
Bounding Box: 40.286118°N, 40.072669°S, -105.128779°E, -105.320587°W

With 31,064 residents spread across 91.07 square miles, this area has a population density of 341.0 people per square mile.

Demographics

31,064

Population

90th percentile

$77,631

Median Income

85th percentile

$348,700

Median Home Value

90th percentile

91.07 mi²

Land Area

The median household income in 80503 is $77,631, and the median home value is $348,700. This places the area in the top 25% nationally for household income.

Housing

13,294

Total Units

12,575

Occupied Units

94.6%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Longmont, CO.

80501

Longmont

80502

Longmont

80504

Longmont

Similar ZIP Codes in Colorado

ZIP codes with similar median household income in Colorado.

80121

Littleton

$86,228

80831

Peyton

$81,000

80128

Littleton

$79,185

80536

Livermore

$70,078

80249

Denver

$68,699

80925

Colorado Springs

$69,261

80137

Watkins

$83,939

80644

Kersey

$69,611

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.