🇺🇸 United States ZIP Code

STANDARD

99121

Danville

ZIP Code 99121 is a standard zip code serving Danville, Danville, Washington (WA), in Ferry County, United States. It has an estimated population of 145 with a median household income of $46,397. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 48.972500
Longitude: -118.488400

Geographic Details

Land Area: 56.67 mi²
Water Area: 0.01 mi²
Population Density: 3.0 people per mi² (5th percentile)
Bounding Box: 49.000456°N, 48.862585°S, -118.364678°E, -118.587306°W

With 145 residents spread across 56.67 square miles, this area has a population density of 3.0 people per square mile.

Demographics

145

Population

$46,397

Median Income

45th percentile

$147,500

Median Home Value

55th percentile

56.67 mi²

Land Area

The median household income in 99121 is $46,397, and the median home value is $147,500.

Housing

106

Total Units

Occupied Units

59.4%

Occupancy Rate

Similar ZIP Codes in Washington

ZIP codes with similar median household income in Washington.

98837

Moses Lake

$49,062

98847

Peshastin

$48,266

99170

Rosalia

$42,865

98362

Port Angeles

$43,827

98822

Entiat

$50,750

98520

Aberdeen

$41,903

98632

Longview

$42,930

98569

Ocean Shores

$42,944

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.