99133 ZIP Code — Grand Coulee, WA

Grant County, Washington

ZIP code 99133 is located in Grand Coulee, Washington, within Grant County. It covers approximately 182.48 square miles and serves a population of 1,377 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

About ZIP code 99133

The housing stock consists of a higher-than-average concentration of mobile homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $208,100. Owner-occupancy sits near the national average at 63%.

Median household income is $59,342. Poverty affects 25% of residents, above the national average. SNAP benefit usage at 24% of households reflects economic stress in the area. 43% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with public administration as the leading industry. The average commute of 13 minutes is near the national average.

Educational attainment is near the national average, with 28% of residents holding a bachelor's degree or higher.

Notable community characteristics include a notable veteran presence at 15% of civilians, above the national average of 7%; and disability rates above the national average at 31%.

Overall, ZIP code 99133 reflects a community defined by economic challenges above the national average, a strong veteran community, a significant Social Security-dependent population, and elevated reliance on food assistance.

1,377

population

182.48

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

99133 ZIP code map

Cities in ZIP code 99133

Below are the cities the US Postal Service accepts for ZIP code 99133. Using any city not on this list may result in mail delivery delays.

City	Status
Grand Coulee	Preferred

Nearby ZIP codes

99123 Electric City (9.4 mi) 99116 Coulee Dam (18.3 mi)

Demographics updated 05/2026

Population
Total population	1,377
Population density	8 / sq mi
State FIPS	53
County FIPS	025

Geography
Land area	182.48 sq mi
Water area	24.37 sq mi
Latitude	48.0044
Longitude	-119.0427
Timezone	Pacific (PT)
Area code	509

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	57.0%	42.1%	31.7%
$50k – $100k	26.9%	34.5%	30.6%
$100k – $200k	13.0%	19.6%	27.1%
Over $200k	3.1%	3.7%	10.6%

Demographics & statistics

1,377

Population

People per sq mi

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

Income range	This ZIP	County avg	State avg
Under $50k	57.0%	42.1%	31.7%
$50k – $100k	26.9%	34.5%	30.6%
$100k – $200k	13.0%	19.6%	27.1%
Over $200k	3.1%	3.7%	10.6%

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%
Work from home	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	%
Obesity	33.9%
High blood pressure	39.5%
High cholesterol	40.5%
Diabetes	13.0%
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	%
Smoking	17.9%
Binge drinking	14.5%
No physical activity	22.8%
Less than 7 hrs sleep	29.6%
Depression	24.2%
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%
No insurance	5.9%
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 about ZIP code 99133

What city is ZIP code 99133 in?

ZIP code 99133 is primarily assigned to Grand Coulee, Washington.

What county is ZIP code 99133 in?

ZIP code 99133 falls within Grant County, Washington.

Does ZIP code 99133 have an older population?

31% of residents in ZIP code 99133 are 65 or older, above the national average of ~17%.

What is the poverty rate in ZIP code 99133?

25% of residents in ZIP code 99133 live below the poverty line, above the national average.

Does ZIP code 99133 have a large retiree population?

43% of households in ZIP code 99133 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 99133 have a large veteran population?

15% of civilians in ZIP code 99133 are veterans, above the national average of ~7%.

What timezone is ZIP code 99133 in?

ZIP code 99133 observes the PST timezone.