Grand Coulee ZIP Codes — Grant County, WA

There is one unique ZIP code in Grand Coulee, Washington and it is 99133. Area code: 509.

ZIP codes

182.48

sq mi land

24.37

sq mi water

509

area code

Grand Coulee, WA ZIP code map

About Grand Coulee, WA

Grand Coulee, Washington, is a small city nestled in the heart of Grant County. Renowned for its stunning landscapes and rich history, it serves as a gateway to outdoor adventures. The city is particularly famous for its proximity to the Grand Coulee Dam, one of the largest concrete structures in the United States.

Location & geography

Geographically, Grand Coulee occupies an area of 182.48 square miles, with an additional 24.37 square miles covered by water. It is located near notable cities such as Coulee City, approximately 24 miles to the southeast, Soap Lake which is about 32 miles to the south, and Ephrata, located around 36 miles to the southwest. The terrain is characterized by rugged hills and the scenic Coulee region, featuring the Columbia River to the east.

Community & economy

Grand Coulee boasts a close-knit community that values its rich heritage. The local economy is driven by industries such as tourism, agriculture, and hydroelectric power, largely due to the nearby Grand Coulee Dam. Daily life is marked by community events, recreational activities in the vast natural surroundings, and a strong sense of local pride.

Transportation

Transportation in Grand Coulee is facilitated by U.S. Route 2, which connects the city to larger regional hubs. The nearest airport is Ephrata Municipal Airport, located about 36 miles away, offering essential air services for residents and visitors alike.

History

Founded in the early 1900s, Grand Coulee was significantly shaped by the construction of the Grand Coulee Dam in the 1930s, which brought both development and prosperity to the area. Key industries have evolved over the years, with agriculture and tourism playing central roles in the community's economic landscape. Notably, the dam also sparked significant population growth as workers flocked to the area for employment.

Did you know?

A little-known fact about Grand Coulee is that it was originally named after the nearby Coulee, which is a deep valley formed by the erosion of riverbeds. Additionally, the city is home to annual events like the Grand Coulee Dam's hydroplane races, which attract visitors from various regions.

ZIP codes for Grand Coulee, WA (1)

ZIP code	City	County	Map
99133	Grand Coulee	Grant	View map

Demographics & statistics

1,377

Population

53.6

Median age

$59,342

Median household income

$33,770

Per capita income

$208,100

Median home value

$661

Median monthly rent

62.8%

Home ownership

24.9%

Poverty rate

10.2%

Unemployment

629

Housing units

27.6%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

135

65–74

150

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	198	14.4%
18 and over	1,179	85.6%
65 and over	433	31.4%
Median age	53.6 years

Race & ethnicity

White 75.9%

American Indian / Alaska Native 13.2%

Two or more races 7.8%

Hispanic or Latino 2.5%

Asian 0.4%

Native Hawaiian / Pacific Islander 0.2%

Group	Count	%
White	1,073	75.9%
American Indian / Alaska Native	186	13.2%
Two or more races	110	7.8%
Hispanic or Latino	36	2.5%
Asian	5	0.4%
Native Hawaiian / Pacific Islander	3	0.2%

Household income

Under $10k 15.6%

$10k–$15k 9.3%

$15k–$25k 15.9%

$25k–$35k 1.7%

$35k–$50k 4.1%

$50k–$75k 13.5%

$75k–$100k 10.1%

$100k–$150k 18.0%

$150k–$200k 7.0%

$200k+ 4.9%

Range	% of households
Under $10k	15.6%
$10k–$15k	9.3%
$15k–$25k	15.9%
$25k–$35k	1.7%
$35k–$50k	4.1%
$50k–$75k	13.5%
$75k–$100k	10.1%
$100k–$150k	18.0%
$150k–$200k	7.0%
$200k+	4.9%
Median income	$59,342

Housing

Home values

Under $50k 4.7%

$50k–$100k 10.5%

$100k–$150k 23.0%

$150k–$200k 7.4%

$200k–$300k 34.9%

$300k–$500k 17.2%

$500k–$1M 2.2%

Housing overview

Metric	Value
Median home value	$208,100
Median rent / month	$661
Owner occupied	62.8%
Renter occupied	37.2%
Vacant	20.4%
Single-family detached	58.9%
Large apartment buildings	7.4%
Mobile homes	22.4%
Median rooms	5.1
Avg household size (owned)	1.80

Year built

Era	%
2020 or later	0.0%
2010–2019	8.8%
2000–2009	3.6%
1990–1999	5.5%
1980–1989	12.8%
1970–1979	20.6%
1960–1969	10.2%
1950–1959	4.1%
1940–1949	9.2%
1939 or earlier	25.3%

Bedrooms

Size	% of units
No bedroom (studio)	2.0%
1 bedroom	14.2%
2 bedrooms	31.9%
3 bedrooms	31.7%
4 bedrooms	15.4%
5+ bedrooms	4.8%

Vehicles per household

Vehicles	% of households
No vehicle	2.9%
1 vehicle	36.8%
2 vehicles	34.6%
3 or more	25.7%

Heating fuel

Fuel type	%
Utility gas	0.8%
Electricity	97.9%
Wood	0.7%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	255	35.8%
Cohabiting couple	20	2.8%
Male householder, no spouse	176	24.7%
Female householder, no spouse	261	36.7%
Households with children under 18	139	19.5%
Households with seniors (65+)	292	41.0%
Average household size	1.90

Marital status

Status	Male	Female
Never married	31.7%	19.1%
Married	50.3%	43.1%
Separated	0.3%	0.0%
Widowed	1.6%	15.2%
Divorced	16.1%	22.6%

Education

Less than 9th grade 2.1%

Some HS, no diploma 9.0%

HS graduate 24.0%

Some college, no degree 29.2%

Associate's degree 8.2%

Bachelor's degree 19.1%

Graduate / professional 8.5%

Metric	%
HS diploma or higher	89.0%
Bachelor's or higher	27.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	3	1.5%
Elementary school	147	73.5%
High school	31	15.5%
College / grad school	19	9.5%

Employment

Industry of employment

Public administration 31.1%

Retail trade 18.0%

Education & healthcare 17.6%

Arts, food & hospitality 8.2%

Professional & management 7.5%

Agriculture & mining 5.4%

Construction 5.2%

Transportation & utilities 2.1%

Finance & real estate 1.9%

Information 1.7%

Manufacturing 0.6%

Wholesale trade 0.6%

Occupation

Category	%
Management, business & arts	30.9%
Service	18.7%
Sales & office	13.9%
Natural resources & construction	27.9%
Production & transportation	8.6%

Employment type

Type	%
Private sector	40.8%
Government	53.9%
Self-employed	5.4%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	80.7%
Carpool	13.1%
Public transit	0.0%
Walk	2.4%
Other means	1.5%
Avg commute (minutes)	13.1

Poverty

All people 24.9%

Under 18 years 26.3%

18 and over 24.6%

Married-couple families 5.1%

Female-led households 29.7%

Income support

Source	% of households
Social Security	43.0%
Retirement income	24.3%
Supplemental Security	9.1%
Cash public assistance	7.3%
Food stamps / SNAP	24.2%

Health indicators

Condition	%
High blood pressure	39.5%
High cholesterol	40.5%
Heart disease	8.6%
Stroke	4.3%
Asthma	11.5%
Arthritis	31.1%
Kidney disease	3.9%
Pulmonary disease	9.0%
Cancer	8.5%

Behavior / access	%
Binge drinking	14.5%
No physical activity	22.8%
Less than 7 hrs sleep	29.6%
Fair or poor health	17.8%
Poor mental health	15.4%
Poor physical health	13.9%
No health insurance	11.3%
Visited doctor (checkup)	73.1%
Visited dentist	64.5%
Cholesterol screening	89.7%
Teeth loss	13.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	171	14.5%

Disability	%
Any disability	30.8%
Under 18	23.7%
18–64 years	23.6%
65 and over	47.3%

Health insurance coverage

Type	%
Private insurance	49.9%
Public insurance	60.8%
Uninsured under 19	11.1%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,366	99.2%
Spanish	2	0.1%
Other Indo-European	2	0.1%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,365	99.1%
Born in same state	1,362	98.9%
Born in different state	784	56.9%
Foreign born	3	0.2%
Naturalized citizen	12	0.9%
Not a US citizen	10	83.3%

Ancestry

Ancestry	Count	%
Arab	315	22.9%
Italian	127	9.2%
French	115	8.4%

Ancestry	Count	%
Polish	82	6%
English	16	1.2%
Dutch	10	0.7%

Technology access

Metric	% of households
Computer access	51.7%
Internet access	96.2%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Grand Coulee, WA have?

Grand Coulee, WA has one ZIP code: 99133. Each ZIP code serves a distinct delivery area within the city and surrounding region.