🇺🇸 United States ZIP Code

STANDARD

98239

Coupeville

ZIP Code 98239 is a standard zip code serving Coupeville, Coupeville, Washington (WA), in Island County, United States. It has an estimated population of 6,646 with a median household income of $60,275. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Washington (WA)
County: Island
City: Coupeville
Timezone: America/Los_Angeles

Coordinates

Latitude: 48.218900
Longitude: -122.682300

Geographic Details

Land Area: 29.27 mi²
Water Area: 13.34 mi²
Population Density: 227.0 people per mi² (60th percentile)
Bounding Box: 48.253812°N, 48.109050°S, -122.566602°E, -122.782201°W

With 6,646 residents spread across 29.27 square miles, this area has a population density of 227.0 people per square mile.

Demographics

6,646

Population

60th percentile

$60,275

Median Income

70th percentile

$313,400

Median Home Value

85th percentile

29.27 mi²

Land Area

The median household income in 98239 is $60,275, and the median home value is $313,400.

Housing

3,714

Total Units

2,986

Occupied Units

80.4%

Occupancy Rate

Similar ZIP Codes in Washington

ZIP codes with similar median household income in Washington.

98240

Custer

$67,292

98524

Allyn

$60,938

98087

Lynnwood

$63,639

98295

Sumas

$59,750

99030

Rockford

$56,053

98023

Federal Way

$67,906

98406

Tacoma

$58,969

99326

Connell

$55,409

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.