🇺🇸 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

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.

80923

Colorado Springs

$76,810

80498

Silverthorne

$70,469

80603

Brighton

$70,232

80122

Littleton

$78,722

80549

Wellington

$72,481

80534

Johnstown

$72,772

80137

Watkins

$83,939

81621

Basalt

$71,523

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.