ZIP Code 91789, California
ZIP Code 91789 profile, demographic data, and geographic information.
ZCTA5 91789 is a 5-digit ZIP Code area located in Los Angeles County, California. As of official census estimates, it has a reported population of 40,298. The land area covers 15.87 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population | 40,298 | ±1,155 | 2020-2024 / Census ACS 5-Year 2024 |
| Median Age | 46.3 yrs | ±1.4 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 12,681 | ±493 | 2020-2024 / Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).
Housing & Real Estate Profile
| Housing Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Total Housing Units | 13,503 | ±479 |
| Occupied Housing Units | 12,681 | ±493 |
| Vacant Housing Units | 822 | ±241 |
| Median Home Value | $975,000 | ±$23,107 |
| Median Gross Rent | $2,865 | ±$124 |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Economy & Workforce
| Economic Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Median Household Income | $125,720 | ±$6,903 |
| Per Capita Income | $49,392 | ±$2,554 |
| Poverty Rate | 9.2% | ±2% |
| Population Below Poverty Level | 3,717 | ±800 |
| Unemployment Rate | 4.4% | ±0.9% |
| Civilian Labor Force, Employed | 18,662 | ±864 |
| Broadband Internet Rate | 96.3% | ±1.1% |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Local Government & Public Administration
Authoritative general-purpose local government units serving this area
U.S. Census Bureau GUS (2026) / GMAF
| Government Unit | Unit Type | Jurisdiction Role | Contact / Address |
|---|---|---|---|
|
GUS Population: 9,757,179 (2024)
ID: 123085
|
County | Official County Government |
Contact: EXECUTIVE OFFICER BOARD OF SUPERVISORS
500 W TEMPLE ST, ROOM 383, LOS ANGELES CA 90012
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Regular School Nearby | KG-06 | Cypress, CA | |
| Alternative School Nearby | 07-12 | Cerritos, CA | |
| Alternative School Nearby | KG-08 | Cerritos, CA | |
| Regular School Nearby | KG-06 | Fullerton, CA | |
| Regular School Nearby | KG-06 | Whittier, CA | |
| Special Education School Nearby | AE | San Dimas, CA | |
| Regular School Nearby | KG-06 | Whittier, CA | |
| Alternative School Nearby | 07-12 | La Verne, CA | |
| Regular School Nearby | KG-06 | Pomona, CA | |
| Regular School Nearby | KG-06 | Chino, CA |
Source: k12guides.com.
Community Facilities & Infrastructure
Displaying 10 civic institutions across 2 datasets queried
CMS • IPEDS • IMLS
| Facility Name | Category | Relationship | Address / Location | Contact |
|---|---|---|---|---|
|
Mt San Antonio College
|
College | 2.1 mi away | 1100 N Grand Ave, Walnut, CA, 91789-1399 |
9092745505
|
|
WALNUT LIBRARY
|
Library | 0.8 mi away | 21155 LA PUENTE RD., WALNUT, CA, 91789 |
(909) 595-0757
|
|
California State Polytechnic University-Pomona
|
College | 3.3 mi away | 3801 W Temple Avenue, Pomona, CA, 91768 |
9098697659
|
|
DIAMOND BAR LIBRARY
|
Library | 1.9 mi away | 21800 COPLEY DR., DIAMOND BAR, CA, 91765 |
(909) 861-4978
|
|
InterCoast Colleges-West Covina
|
College | 4.5 mi away | 2235 East Garvey Ave. North Suite B, West Covina, CA, 91791 |
6263376800
|
|
ROWLAND HEIGHTS LIBRARY
|
Library | 3.1 mi away | 1850 NOGALES ST., ROWLAND HEIGHTS, CA, 91748 |
(626) 912-5348
|
|
UEI College-West Covina
|
College Vocational | 5.1 mi away | 339 N. Azusa Avenue, West Covina, CA, 91731-2806 |
6269279000
|
|
LA PUENTE LIBRARY
|
Library | 5.5 mi away | 15920 EAST CENTRAL AVE., LA PUENTE, CA, 91744 |
(626) 968-4613
|
|
Salon Success Academy-West Covina
|
College Vocational | 5.8 mi away | 112 Plaza Drive Suite 166, West Covina, CA, 91790-2876 |
9099824200
|
|
EAST BOOKMOBILE
|
Library | 6.1 mi away | 1601 WEST COVINA PKWY, WEST COVINA, CA, 91790 |
(626) 337-7339
|
Distances calculated from authoritative source coordinates. Source: CMS, IMLS, NCES IPEDS.
Climate & Weather Observations
NOAA Monthly Climate Normals
Observation Station: Climate data reflects NOAA 1991–2020 standard normals recorded at POMONA/FAIRPLEX, CA US, located 6.7 miles from ZCTA5 91789. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 67.9° | 43.1° | 55.5° | 2.91" | 0.0" |
| February | 67.3° | 44.5° | 55.9° | 4.15" | 0.0" |
| March | 72.0° | 47.0° | 59.5° | 2.12" | 0.0" |
| April | 75.8° | 49.6° | 62.7° | 0.97" | 0.0" |
| May | 78.4° | 54.0° | 66.2° | 0.22" | 0.0" |
| June | 84.3° | 57.2° | 70.8° | 0.06" | 0.0" |
| July | 90.3° | 62.3° | 76.3° | 0.00" | 0.0" |
| August | 92.4° | 62.7° | 77.5° | 0.03" | 0.0" |
| September | 88.7° | 60.4° | 74.6° | 0.01" | 0.0" |
| October | 80.5° | 53.9° | 67.2° | 0.97" | 0.0" |
| November | 73.5° | 47.0° | 60.2° | 0.74" | 0.0" |
| December | 66.9° | 41.5° | 54.2° | 2.29" | 0.0" |
Source: NOAA U.S. Climate Normals (1991–2020).
Local Weather Forecast
Weather forecast data is currently unavailable in the local cache.
Nearby Cities & Communities
Listing adjacent communities by spatial proximity (miles)
Proximity discovery
| Community Name | Classification | Distance | Population |
|---|---|---|---|
| Walnut city | City | 1.3 mi | — |
| Diamond Bar city | City | 2.4 mi | — |
| South San Jose Hills CDP | CDP | 2.9 mi | — |
| Rowland Heights CDP | CDP | 3.9 mi | — |
| West Covina city | City | 4.1 mi | — |
| Valinda CDP | CDP | 4.6 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 91789. • Official Source Dataset →
- Socioeconomic & Housing Metrics: U.S. Census Bureau American Community Survey (ACS) 5-year estimates and Population Estimates Program (PEP). Margin of Error (MOE) intervals are reported where published; suppressed values are never estimated or replaced with false zeros.
- Civic Directory Datasets: Centers for Medicare & Medicaid Services (CMS Hospital Directory), National Center for Education Statistics (NCES IPEDS Postsecondary Directory), and Institute of Museum and Library Services (IMLS Public Libraries Survey). Airport landing facilities are provided by airport-data.com.
- Weather & Climate Observations: National Oceanic and Atmospheric Administration (NOAA) U.S. Climate Normals 1991–2020 and National Weather Service (NWS) point forecasts.