Walnut is a city in Los Angeles County, California, home to about 27,611 people across 9.0 square miles. Its ZIP code is 91789.
Homes sold for a median of $612 per square foot in the three months ending August 2026, a balanced market.
Mostly Walnut; also Diamond Bar and Rowland Heights
Each card is that ZIP code’s whole market, including any part outside Walnut. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Walnut’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Ontario International Airport (ONT)15 miles away |
|---|---|
| Nearest city of 250,000+ | Anaheim, CA13 miles away |
| Nearest city of 1 million+ | Los Angeles, CA32 miles away |
Straight-line distances from the center of Walnut; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Walnut had 28,430 residents in the 2020 census, down 5% since 2000.
It’s the 281st largest of 1,563 towns in California by population.
Los Angeles County grew from 170,298 residents in 1900 to 10,014,009 in 2020.
Los Angeles County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 92°F in summer, and winter lows average 42°F. About 14.5 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Pomona/Fairplex, CA weather station (7 miles away).
3,987,736 jobs at 304,988 businesses in Los Angeles County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
198 doctors and other health care providers list an office in Walnut.
Nearest hospitals
Providers with an office here
| Primary care doctors | 10 |
|---|---|
| Specialist doctors | 10 |
| Dentists | 61 |
| Nurse practitioners and physician assistants | 41 |
| Mental health providers | 32 |
| Physical and occupational therapists | 25 |
| Optometrists | 5 |
| Chiropractors | 14 |
| Pharmacies | 6 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (14 nearby)
Grocery stores (5 nearby)
Pharmacies (1 nearby)
Libraries (2 nearby)
Museums
Theaters and performance venues
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1959.
Colleges and universities
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Walnut Valley Unified, Rowland Unified. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Collegewood ElementaryWalnut Valley | K–5 | 606 | Public | 2.2 mi |
| Cyrus J. Morris ElementaryWalnut | K–5 | 485 | Public | 0.9 mi |
| Leonard G. Westhoff ElementaryWalnut | K–5 | 654 | Public | 1.5 mi |
| Stanley G. Oswalt AcademyWalnut | K–8 | 879 | Public | 1.6 mi |
| Vejar ElementaryWalnut | K–5 | 631 | Public | 0.4 mi |
| Walnut ElementaryWalnut | K–5 | 706 | Public | 1.1 mi |
| Ybarra Academy for the Arts and TechnologyWalnut | K–8 | 630 | Public | 2.1 mi |
| South Pointe MiddleWalnut | 6–8 | 979 | Public | 1.9 mi |
| Suzanne MiddleWalnut | 6–8 | 1,190 | Public | 0.5 mi |
| Ron Hockwalt Academies (Continuation)Walnut | 9–12 | 36 | Alternative Education | 0.7 mi |
| Walnut HighWalnut | 9–12 | 2,148 | Public | 0.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Kid JunctionWalnut | Pre-K–K | 6 | Christian (no specific denomination) | 1.9 mi |
| Tzu Chi Elementary SatoaWalnut | Pre-K–5 | 81 | Nonsectarian | 2.4 mi |
| Discovery World MontessoriWalnut | TK–K | 10 | Nonsectarian | 1.2 mi |
| Tzu Chi Elementary SchoolWalnut | TK–5 | 94 | Nonsectarian | 2.4 mi |
| Bright Hope Education CenterWalnut | K–6 | 73 | Christian (no specific denomination) | 0.7 mi |
| Learning Tree Walnut Education CenterWalnut | K–2 | 9 | Nonsectarian | 1.7 mi |
| River of Joy SchoolWalnut | 1–10 | 38 | Christian (no specific denomination) | 0.3 mi |
| Allais SchoolWalnut | 4–9 | 25 | Nonsectarian | 0.5 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Diamond Bar, Rowland Heights, Pomona and Industry.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.