Walnut, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Walnut, California is 27,857 as of the 2023 American Community Survey, making it the 281st-largest city in California. The median household income is $133,762, the median home value is $972,500, and the median age is 46.4.
The population has declined 6.7% since 2010 (29,203 → 27,250).
27,857
Population
3099
People / sq mi
$133,762
Median Income
$972,500
Median Home Value
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Walnut covers 9.0 sq mi of land at 3099 people per square mile.
About Walnut, CA
In Walnut, home values do the distinguishing — a median of $972,500. Walnut is a city in California with a population of 27,857.
The typical household earns $133,762 a year, above the US median of $78,538. The poverty rate is 7.1%, below the national 12.4%. Real estate commands a premium here — a median home value of $972,500, with typical rent around $3,120.
Educational attainment is on the higher side for US cities — 55.3% of adults hold a four-year degree, above the national 35.0%. Remote work is on the higher side at 18.5%, above the national 14.0%, and the average commute runs about 35 minutes each way.
High housing values reframe the income picture in Walnut — even solid earnings stretch less against home prices and rents at this level.
Walnut city Population History (2010-2024)
The city of Walnut city had a population of 29,203 in 2010 and 27,250 in 2024, a -6.7% growth over 14 years. The peak was 30,015 in 2017. Average annual growth rate: -0.48%.
27,250
Population (2024)
29,203
Population (2010)
30,015
Peak (2017)
-0.48%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 29,203 |
| 2011 | 29,471 |
| 2012 | 29,842 |
| 2013 | 29,919 |
| 2014 | 29,940 |
| 2015 | 29,990 |
| 2016 | 29,925 |
| 2017 | 30,015 |
| 2018 | 29,910 |
| 2019 | 29,685 |
| 2020 | 28,350 |
| 2021 | 27,775 |
| 2022 | 27,445 |
| 2023 | 27,284 |
| 2024 | 27,250 |
Race & Ethnicity
| White | 12.7% |
| Black or African American | 2.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.5% |
| Two or More Races | 0.4% |
Economy & Income
$133,762
Median Household Income
$51,555
Per Capita Income
7.1%
Poverty Rate
2.1%
Unemployment Rate
Housing
$972,500
Median Home Value
$3,120
Median Rent
82.7%
Owner-Occupied
Education
93.9%
High School+
55.3%
Bachelor's+
Commute
2.4%
Drive Alone
68.0%
Public Transit
18.5%
Work From Home
34.5 min
Avg Commute
Community Profile
6.7%
Foreign Born
33.3%
Non-English at Home
2.7%
Veterans
7.5%
With Disability
95.2%
Health Insurance
97.6%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 25.0% |
| Finance, Insurance & Real Estate | 13.7% |
| Information | 10.0% |
| Manufacturing | 7.6% |
| Education, Health Care & Social Services | 6.7% |
| Retail Trade | 6.0% |
| Public Administration | 4.7% |
| Arts, Entertainment & Food Services | 3.9% |
| Construction | 3.2% |
| Transportation & Warehousing | 1.5% |
| Agriculture & Mining | 0.5% |
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Frequently Asked Questions
Walnut, California has a population of 27,857 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 281st-largest city in California.
The median household income in Walnut, California is $133,762, with 7.1% of residents living below the federal poverty level.
The median home value in Walnut, California is $972,500, with median monthly rent at $3,120 and a homeownership rate of 82.7%.
The median age in Walnut, California is 46.4 years. The population is 49.6% male and 50.4% female.
The population has declined 6.7% since 2010 (29,203 → 27,250).
Walnut city, CA Climate
Walnut city, CA has an average annual temperature of 18.1°C (65°F) and receives about 419 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
18.1°C
Avg Temp
419
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 13° / 55° | 88 mm |
| February | 14° / 57° | 91 mm |
| March | 15° / 58° | 78 mm |
| April | 17° / 62° | 28 mm |
| May | 19° / 65° | 5 mm |
| June | 21° / 70° | 2 mm |
| July | 24° / 75° | 1 mm |
| August | 24° / 76° | 3 mm |
| September | 23° / 74° | 8 mm |
| October | 20° / 68° | 12 mm |
| November | 16° / 60° | 46 mm |
| December | 13° / 55° | 57 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Walnut city, CA
The most comfortable months to visit Walnut city, CA are typically June, October and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 32°C high). The coldest is January (near 6°C low). February is usually the wettest month.
Where to stay near Walnut
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.