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🇺🇸 United States ZIP Code

STANDARD

80305

Boulder

ZIP Code 80305 is a standard zip code serving Boulder, Boulder, Colorado (CO), in Boulder County, United States. It has an estimated population of 16,874 with a median household income of $80,476. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

$0 National: $37,585 $150K+ $80,476

Location

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

Coordinates

Latitude
39.980700
Longitude
-105.253100

Geographic Details

Land Area
7.23 mi²
Water Area
0.05 mi²
Population Density
2334.0 people per mi² (85th percentile)
Bounding Box
40.008275°N, 39.936196°S, -105.212823°E, -105.285947°W

With 16,874 residents spread across 7.23 square miles, this area has a population density of 2334.0 people per square mile.

Demographics

16,874

Population

75th percentile

$80,476

Median Income

90th percentile

$469,000

Median Home Value

95th percentile

7.23 mi²

Land Area

The median household income in 80305 is $80,476, and the median home value is $469,000. This places the area in the top 25% nationally for household income.

Housing

7,314

Total Units

7,107

Occupied Units

97.2%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Boulder, CO.

80301

Boulder

 80302

Boulder

 80303

Boulder

 80304

Boulder

 80306

Boulder

 80307

Boulder

 80308

Boulder

 80309

Boulder

 80310

Boulder

 80314

Boulder

Similar ZIP Codes in Colorado

ZIP codes with similar median household income in Colorado.

80005

Arvada

$84,501

 80015

Aurora

$80,599

 80020

Broomfield

$77,600

 80021

Broomfield

$71,221

 80026

Lafayette

$71,117

 80031

Westminster

$70,536

 80104

Castle Rock

$81,017

 80107

Elizabeth

$85,141

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.