Walnut ZIP Codes — Los Angeles County, CA

There are 2 unique ZIP codes in Walnut, California. Area code: 909.

ZIP codes

15.87

sq mi land

0.05

sq mi water

909

area code

Walnut, CA ZIP code map

About Walnut, CA

Walnut, California, is a picturesque city located in the heart of Los Angeles County. Known for its suburban charm and rich community spirit, Walnut offers a perfect blend of residential comfort and easy access to urban amenities. With a strong sense of pride in its local culture and numerous parks, Walnut serves as a desirable place to live and visit.

Location & geography

Walnut is situated in the San Gabriel Valley region, surrounded by the foothills of the San Gabriel Mountains. It is bordered by the cities of Diamond Bar to the east, West Covina to the south, and Rowland Heights to the west, with each city located approximately within five miles. The total land area of Walnut measures 47.60 square miles, while its water area covers 0.15 square miles, making it predominantly land-based.

Community & economy

The character of Walnut is defined by a close-knit community that values education, recreation, and cultural diversity. The city is home to various industries, including retail, education, and technology, which contribute to the local economy. Daily life in Walnut is enhanced by well-maintained parks, local events, and community programs that foster a strong sense of belonging among residents.

Transportation

Walnut is conveniently located near major highways, including California State Route 60, which provides easy access to neighboring areas and cities. The nearest significant transportation hub is Ontario International Airport, located approximately 15 miles to the east. Additionally, residents can benefit from local public transit services that support commuting and access to surrounding cities.

History

Walnut was incorporated in 1959, emerging as a small agricultural community before evolving into a suburban city. The region was originally inhabited by indigenous peoples and later developed alongside the expansion of Los Angeles County. Notable events in Walnut's history include the establishment of various community programs and public parks that still serve the residents today.

Did you know?

A surprising fact about Walnut is that it is home to the bustling Walnut Farmers Market, which attracts many visitors every Saturday. Additionally, Walnut is known for its beautiful rolling hills and diverse plant life, making it a scenic location for outdoor activities.

ZIP codes for Walnut, CA (2)

ZIP code	City	County	Map
91788	Walnut	Los Angeles	View map
91789	Walnut	Los Angeles	View map

Demographics & statistics

41,377

Population

46.1

Median age

$123,555

Median household income

$48,176

Per capita income

$910,400

Median home value

$2,690

Median monthly rent

82.0%

Home ownership

7.2%

Poverty rate

4.6%

Unemployment

11,246

Housing units

53.2%

Bachelor's or higher

Age distribution

Male Female

880

Under 5

918

1,015

5–9

1,058

1,279

10–14

1,333

979

15–19

1,020

1,163

20–24

1,212

2,387

25–34

2,490

2,181

35–44

2,275

2,564

45–54

2,673

1,699

55–59

1,771

1,714

60–64

1,787

2,856

65–74

2,978

1,227

75–84

1,280

312

85+

326

← Male

Female →

Age summary

Group	Count	%
Under 18	7,779	18.8%
18 and over	33,598	81.2%
65 and over	8,979	21.7%
Median age	46.1 years

Race & ethnicity

Asian 58.2%

White 14.5%

Hispanic or Latino 10.9%

Other race 7.1%

Two or more races 6.5%

Black or African American 2.1%

Native Hawaiian / Pacific Islander 0.5%

American Indian / Alaska Native 0.2%

Group	Count	%
Asian	27,014	58.2%
White	6,742	14.5%
Hispanic or Latino	5,049	10.9%
Other race	3,297	7.1%
Two or more races	3,011	6.5%
Black or African American	995	2.1%
Native Hawaiian / Pacific Islander	224	0.5%
American Indian / Alaska Native	94	0.2%

Household income

Under $10k 4.6%

$10k–$15k 0.7%

$15k–$25k 3.3%

$25k–$35k 3.9%

$35k–$50k 4.7%

$50k–$75k 11.9%

$75k–$100k 11.2%

$100k–$150k 21.1%

$150k–$200k 14.6%

$200k+ 23.9%

Range	% of households
Under $10k	4.6%
$10k–$15k	0.7%
$15k–$25k	3.3%
$25k–$35k	3.9%
$35k–$50k	4.7%
$50k–$75k	11.9%
$75k–$100k	11.2%
$100k–$150k	21.1%
$150k–$200k	14.6%
$200k+	23.9%
Median income	$123,555

Housing

Home values

Under $50k 0.9%

$50k–$100k 2.6%

$100k–$150k 1.2%

$150k–$200k 1.4%

$200k–$300k 0.4%

$300k–$500k 3.0%

$500k–$1M 54.8%

$1M+ 35.6%

Housing overview

Metric	Value
Median home value	$910,400
Median rent / month	$2,690
Owner occupied	82.0%
Renter occupied	18.0%
Vacant	6.2%
Single-family detached	87.1%
Large apartment buildings	2.2%
Mobile homes	3.7%
Median rooms	6.5
Avg household size (owned)	3.16

Year built

Era	%
2020 or later	0.0%
2010–2019	1.8%
2000–2009	3.8%
1990–1999	6.4%
1980–1989	46.1%
1970–1979	24.4%
1960–1969	13.8%
1950–1959	2.6%
1940–1949	0.2%
1939 or earlier	0.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	0.8%
2 bedrooms	7.7%
3 bedrooms	31.4%
4 bedrooms	46.8%
5+ bedrooms	12.8%

Vehicles per household

Vehicles	% of households
No vehicle	1.8%
1 vehicle	14.8%
2 vehicles	40.3%
3 or more	43.1%

Heating fuel

Fuel type	%
Utility gas	82.2%
Electricity	15.1%
Propane / LP gas	1.4%
Wood	0.2%
Solar	0.5%
No fuel used	0.5%

Households & families

Household type	Count	%
Married-couple family	8,826	69.5%
Cohabiting couple	328	2.6%
Male householder, no spouse	1,225	9.6%
Female householder, no spouse	2,319	18.3%
Households with children under 18	4,092	32.2%
Households with seniors (65+)	5,596	44.1%
Average household size	3.25

Marital status

Status	Male	Female
Never married	33.0%	25.9%
Married	60.7%	59.4%
Separated	0.8%	1.2%
Widowed	2.4%	6.3%
Divorced	3.1%	7.2%

Education

Less than 9th grade 4.2%

Some HS, no diploma 3.0%

HS graduate 15.4%

Some college, no degree 15.4%

Associate's degree 8.8%

Bachelor's degree 36.1%

Graduate / professional 17.1%

Metric	%
HS diploma or higher	92.8%
Bachelor's or higher	53.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	424	4.3%
Kindergarten	651	6.6%
Elementary school	3,499	35.6%
High school	1,730	17.6%
College / grad school	3,514	35.8%

Employment

Industry of employment

Education & healthcare 22.4%

Professional & management 12.1%

Retail trade 11.4%

Finance & real estate 9.5%

Arts, food & hospitality 8.3%

Manufacturing 8.1%

Wholesale trade 6.7%

Transportation & utilities 6.6%

Public administration 5.3%

Other services 4.0%

Construction 3.9%

Information 1.4%

Agriculture & mining 0.4%

Occupation

Category	%
Management, business & arts	52.1%
Service	11.5%
Sales & office	24.1%
Natural resources & construction	3.5%
Production & transportation	8.8%

Employment type

Type	%
Private sector	77.6%
Government	15.3%
Self-employed	6.8%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	71.2%
Carpool	9.0%
Public transit	2.0%
Walk	0.4%
Other means	1.8%
Avg commute (minutes)	35.6

Poverty

All people 7.2%

Under 18 years 8.1%

18 and over 7.0%

Married-couple families 5.5%

Female-led households 8.6%

Income support

Source	% of households
Social Security	37.3%
Retirement income	25.5%
Supplemental Security	4.3%
Cash public assistance	2.7%
Food stamps / SNAP	4.8%

Health indicators

Condition	%
High blood pressure	25.4%
High cholesterol	30.5%
Heart disease	4.2%
Stroke	2.1%
Asthma	6.7%
Arthritis	15.0%
Kidney disease	2.2%
Pulmonary disease	3.4%
Cancer	4.6%

Behavior / access	%
Binge drinking	12.7%
No physical activity	17.5%
Less than 7 hrs sleep	31.3%
Fair or poor health	10.2%
Poor mental health	10.9%
Poor physical health	6.9%
No health insurance	9.1%
Visited doctor (checkup)	65.7%
Visited dentist	68.1%
Cholesterol screening	92.9%
Teeth loss	5.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,169	3.5%

Disability	%
Any disability	7.8%
Under 18	2.1%
18–64 years	5.0%
65 and over	20.7%

Health insurance coverage

Type	%
Private insurance	71.3%
Public insurance	32.9%
Uninsured under 19	3.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	39,579	95.7%
Spanish	12,435	31.4%
Other Indo-European	926	2.3%
Asian & Pacific Islander	364	0.9%
Other languages	11,107	28.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	21,223	51.3%
Born in same state	20,611	49.8%
Born in different state	17,662	42.7%
Foreign born	612	1.5%
Naturalized citizen	20,154	48.7%
Not a US citizen	14,804	73.5%

Ancestry

Ancestry	Count	%
French	1,038	2.5%
Arab	821	2%
Italian	580	1.4%
Norwegian	151	0.4%
German	72	0.2%

Ancestry	Count	%
Irish	67	0.2%
English	41	0.1%
Polish	40	0.1%
Dutch	25	0.1%

Technology access

Metric	% of households
Computer access	30.7%
Internet access	98.2%

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

Frequently asked questions

What ZIP codes does Walnut, CA have?

Walnut, CA has one ZIP code: 91789. Each ZIP code serves a distinct delivery area within the city and surrounding region.