99135 ZIP Code — Hartline, WA

Grant County, Washington

ZIP code 99135 is located in Hartline, Washington, within Grant County. It covers approximately 173.58 square miles and serves a population of 452 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

About ZIP code 99135

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $186,100. Owner-occupancy is high at 91%, well above the national average.

Median household income is $84,896. 45% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with agriculture and mining as the leading industry. The average commute of 31 minutes is near the national average. Remote work is prevalent — 27% of workers work from home.

Educational attainment is near the national average, with 22% of residents holding a bachelor's degree or higher.

Overall, ZIP code 99135 reflects a community defined by high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

452

population

173.58

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

99135 ZIP code map

Cities in ZIP code 99135

Below are the cities the US Postal Service accepts for ZIP code 99135. Using any city not on this list may result in mail delivery delays.

City	Status
Hartline	Preferred

Nearby ZIP codes

99115 Coulee City (12.6 mi) 99103 Almira (12.9 mi) 99123 Electric City (13.2 mi)

Demographics updated 05/2026

Population
Total population	452
Population density	3 / sq mi
State FIPS	53
County FIPS	025

Geography
Land area	173.58 sq mi
Water area	0.02 sq mi
Latitude	47.6864
Longitude	-119.1498
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	47.0%	42.1%	31.7%
$50k – $100k	42.2%	34.5%	30.6%
$100k – $200k	10.8%	19.6%	27.1%
Over $200k	0.0%	3.7%	10.6%

Demographics & statistics

452

Population

People per sq mi

34.9

Median age

$84,896

Median household income

$31,851

Per capita income

$186,100

Median home value

$1,014

Median monthly rent

90.7%

Home ownership

1.1%

Poverty rate

0.0%

Unemployment

193

Housing units

21.6%

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

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	128	28.3%
18 and over	324	71.7%
65 and over	102	22.6%
Median age	34.9 years

Race & ethnicity

White 94.2%

Two or more races 3.7%

Hispanic or Latino 2.2%

Group	Count	%
White	435	94.2%
Two or more races	17	3.7%
Hispanic or Latino	10	2.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	47.0%	42.1%	31.7%
$50k – $100k	42.2%	34.5%	30.6%
$100k – $200k	10.8%	19.6%	27.1%
Over $200k	0.0%	3.7%	10.6%

Under $10k 1.1%

$15k–$25k 4.4%

$25k–$35k 6.6%

$35k–$50k 24.0%

$50k–$75k 6.0%

$75k–$100k 32.8%

$100k–$150k 21.3%

$150k–$200k 2.7%

$200k+ 1.1%

Range	% of households
Under $10k	1.1%
$15k–$25k	4.4%
$25k–$35k	6.6%
$35k–$50k	24.0%
$50k–$75k	6.0%
$75k–$100k	32.8%
$100k–$150k	21.3%
$150k–$200k	2.7%
$200k+	1.1%
Median income	$84,896

Housing

Home values

Under $50k 0.6%

$50k–$100k 8.4%

$100k–$150k 15.1%

$150k–$200k 28.9%

$200k–$300k 8.4%

$300k–$500k 5.4%

$500k–$1M 33.1%

Housing overview

Metric	Value
Median home value	$186,100
Median rent / month	$1,014
Owner occupied	90.7%
Renter occupied	9.3%
Vacant	12.9%
Single-family detached	97.1%
Large apartment buildings	0.0%
Mobile homes	1.9%
Median rooms	6.3
Avg household size (owned)	2.55

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	6.7%
1990–1999	0.0%
1980–1989	15.7%
1970–1979	5.2%
1960–1969	5.2%
1950–1959	1.0%
1940–1949	8.6%
1939 or earlier	57.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	12.4%
2 bedrooms	19.5%
3 bedrooms	22.9%
4 bedrooms	23.3%
5+ bedrooms	21.9%

Vehicles per household

Vehicles	% of households
No vehicle	3.3%
1 vehicle	19.1%
2 vehicles	27.3%
3 or more	50.3%

Heating fuel

Fuel type	%
Electricity	84.7%
Propane / LP gas	3.8%
Fuel oil	2.2%
Wood	8.2%
No fuel used	1.1%

Households & families

Household type	Count	%
Married-couple family	73	39.9%
Cohabiting couple	5	2.7%
Male householder, no spouse	79	43.2%
Female householder, no spouse	26	14.2%
Households with children under 18	65	35.5%
Households with seniors (65+)	79	43.2%
Average household size	2.47

Marital status

Status	Male	Female
Never married	14.4%	22.9%
Married	42.8%	51.6%
Separated	1.1%	3.3%
Widowed	18.3%	11.1%
Divorced	23.3%	11.1%

Education

Less than 9th grade 2.5%

Some HS, no diploma 5.0%

HS graduate 26.6%

Some college, no degree 29.1%

Associate's degree 15.2%

Bachelor's degree 11.3%

Graduate / professional 10.3%

Metric	%
HS diploma or higher	92.6%
Bachelor's or higher	21.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	6	4.3%
Kindergarten	14	10.1%
Elementary school	93	66.9%
High school	23	16.5%
College / grad school	3	2.2%

Employment

Industry of employment

Agriculture & mining 36.0%

Education & healthcare 20.7%

Arts, food & hospitality 16.7%

Construction 10.3%

Professional & management 4.9%

Retail trade 4.4%

Finance & real estate 2.0%

Wholesale trade 1.5%

Public administration 1.5%

Transportation & utilities 1.0%

Other services 1.0%

Occupation

Category	%
Management, business & arts	36.9%
Service	7.4%
Sales & office	19.2%
Natural resources & construction	28.1%
Production & transportation	8.4%

Employment type

Type	%
Private sector	69.5%
Government	27.6%
Self-employed	2.0%
Unpaid family workers	1.0%

Commute

Method	%
Drive alone	59.6%
Carpool	8.9%
Public transit	1.0%
Walk	3.9%
Work from home	26.6%
Other means	0.0%
Avg commute (minutes)	30.7

Poverty

All people 1.1%

Under 18 years 0.0%

18 and over 1.5%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	45.4%
Retirement income	38.8%
Supplemental Security	0.0%
Cash public assistance	1.1%
Food stamps / SNAP	0.5%

Health indicators

Condition	%
Obesity	32.0%
High blood pressure	38.8%
High cholesterol	40.3%
Diabetes	12.4%
Heart disease	8.4%
Stroke	4.0%
Asthma	11.0%
Arthritis	29.0%
Kidney disease	3.7%
Pulmonary disease	8.5%
Cancer	8.1%

Behavior / access	%
Smoking	17.3%
Binge drinking	15.2%
No physical activity	21.9%
Less than 7 hrs sleep	29.4%
Depression	23.2%
Fair or poor health	16.8%
Poor mental health	15.0%
Poor physical health	13.3%
No health insurance	11.7%
Visited doctor (checkup)	71.8%
Visited dentist	65.3%
Cholesterol screening	88.8%
Teeth loss	13.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	26	8.0%

Disability	%
Any disability	10.8%
Under 18	3.1%
18–64 years	7.2%
65 and over	28.4%

Health insurance coverage

Type	%
Private insurance	76.8%
Public insurance	48.9%
No insurance	5.1%
Uninsured under 19	8.6%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	443	98.0%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	452	100.0%
Born in same state	450	99.6%
Born in different state	371	82.1%
Foreign born	2	0.4%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	105	23.2%
French	41	9.1%
Arab	33	7.3%
Italian	29	6.4%

Ancestry	Count	%
English	2	0.4%
Dutch	2	0.4%
German	1	0.2%

Technology access

Metric	% of households
Computer access	40.5%
Internet access	94.0%

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

Frequently asked questions about ZIP code 99135

What city is ZIP code 99135 in?

ZIP code 99135 is primarily assigned to Hartline, Washington.

What county is ZIP code 99135 in?

ZIP code 99135 falls within Grant County, Washington.

Is ZIP code 99135 mostly owner-occupied?

91% of occupied units in ZIP code 99135 are owner-occupied, well above the national average.

Does ZIP code 99135 have a large retiree population?

45% of households in ZIP code 99135 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 99135?

The median home value in ZIP code 99135 is $186,100.

What is the population of ZIP code 99135?

ZIP code 99135 has an estimated population of 452 residents, with a density of 3 people per square mile.

What timezone is ZIP code 99135 in?

ZIP code 99135 observes the PST timezone.