🇺🇸 United States ZIP Code

STANDARD

99133

Grand Coulee

ZIP Code 99133 is a standard zip code serving Grand Coulee, Grand Coulee, Washington (WA), in Grant County, United States. It has an estimated population of 1,493 with a median household income of $40,496. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Washington (WA)
County: Grant
City: Grand Coulee
Timezone: America/Los_Angeles

Coordinates

Latitude: 47.938500
Longitude: -118.997800

Geographic Details

Land Area: 147.94 mi²
Water Area: 10.01 mi²
Population Density: 10.0 people per mi² (10th percentile)
Bounding Box: 48.151023°N, 47.902548°S, -118.745376°E, -119.276708°W

With 1,493 residents spread across 147.94 square miles, this area has a population density of 10.0 people per square mile.

Demographics

1,493

Population

35th percentile

$40,496

Median Income

30th percentile

$114,700

Median Home Value

40th percentile

147.94 mi²

Land Area

The median household income in 99133 is $40,496, and the median home value is $114,700.

Housing

886

Total Units

719

Occupied Units

81.2%

Occupancy Rate

Similar ZIP Codes in Washington

ZIP codes with similar median household income in Washington.

99218

Spokane

$45,983

98831

Manson

$44,357

98944

Sunnyside

$36,703

99166

Republic

$40,417

98812

Brewster

$42,212

98303

Anderson Island

$43,333

98361

Packwood

$40,107

99110

Clayton

$40,614

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.