🇺🇸 United States ZIP Code

PO BOX

99587

Girdwood

ZIP Code 99587 is a po box zip code serving Girdwood, Girdwood, Alaska (AK), in Anchorage Municipality County, United States. It has an estimated population of 2,250 with a median household income of $81,949. The area falls within the America/Anchorage timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Alaska (AK)
County: Anchorage Municipality
City: Girdwood
Timezone: America/Anchorage

Coordinates

Latitude: 60.957700
Longitude: -149.140600

Geographic Details

Land Area: 242.31 mi²
Water Area: 7.98 mi²
Population Density: 9.0 people per mi² (10th percentile)
Bounding Box: 61.070690°N, 60.733787°S, -148.652008°E, -149.184788°W

With 2,250 residents spread across 242.31 square miles, this area has a population density of 9.0 people per square mile.

Demographics

2,250

Population

40th percentile

$81,949

Median Income

90th percentile

$384,000

Median Home Value

90th percentile

242.31 mi²

Land Area

The median household income in 99587 is $81,949, and the median home value is $384,000. This places the area in the top 25% nationally for household income.

Housing

1,658

Total Units

1,044

Occupied Units

63.0%

Occupancy Rate

Similar ZIP Codes in Alaska

ZIP codes with similar median household income in Alaska.

99723

Barrow

$90,500

99714

Salcha

$76,250

99705

North Pole

$76,156

99502

Anchorage

$89,291

99712

Fairbanks

$85,085

99654

Wasilla

$72,743

99686

Valdez

$93,313

99611

Kenai

$70,320

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.