🇺🇸 United States ZIP Code

STANDARD

98645

Silverlake

ZIP Code 98645 is a standard zip code serving Silverlake, Silverlake, Washington (WA), in Cowlitz County, United States. It has an estimated population of 1,429 with a median household income of $55,903. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 46.316300
Longitude: -122.764900

Geographic Details

Land Area: 14.90 mi²
Water Area: 2.49 mi²
Population Density: 96.0 people per mi² (50th percentile)
Bounding Box: 46.375381°N, 46.270323°S, -122.724504°E, -122.824849°W

With 1,429 residents spread across 14.90 square miles, this area has a population density of 96.0 people per square mile.

Demographics

1,429

Population

30th percentile

$55,903

Median Income

65th percentile

$174,100

Median Home Value

65th percentile

14.90 mi²

Land Area

The median household income in 98645 is $55,903, and the median home value is $174,100.

Housing

657

Total Units

542

Occupied Units

82.5%

Occupancy Rate

Similar ZIP Codes in Washington

ZIP codes with similar median household income in Washington.

98295

Sumas

$59,750

98664

Vancouver

$53,290

98146

Seattle

$56,809

98597

Yelm

$55,226

98144

Seattle

$55,950

98580

Roy

$62,676

99029

Reardan

$55,500

98106

Seattle

$57,875

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.