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91789
  1. Home
  2. ZIP Codes
  3. ZIP Code 91789
California (CA)Los Angeles CountyLos Angeles-Long Beach-Anaheim840909

ZIP Code 91789 — Walnut, CA

Los Angeles County * Los Angeles-Long Beach-Anaheim metro

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40.3K

Population

$125.7K

Median income

per household

$975K

Home value

9.3%

Poverty rate

What stands out

  • Median household income: $125.7K (top 10% vs US ZIP codes).
  • Median home value: $975K (top 10% vs US ZIP codes).
  • Poverty rate: 9.3%.

Categories vs U.S.

Economy

5 of 5 metrics better than U.S. benchmarks

Housing stretch: typical home values are about 7.8× the median household income.

Median household income

$125.7K

U.S.

$81K

Per-capita income

$49.4K

U.S.

$45K

Median home value

$975K

U.S.

$333K

Housing stress

Rent-burdened renters (≥30%)

59.1%

U.S.

51.1%

Severely rent-burdened (≥50%)

31.2%

U.S.

25.9%

Affordability Ratios

Rent-to-Income

27.3%

Approaching 30% threshold

Home-Value-to-Income

7.8×

Above typical 3-5x ratio

Income distribution

Share of households by income bracket (ACS).

< $50k
19.3%
$50–100k
19.7%
$100–200k
35.5%
$200k+
25.5%

Health

5 of 6 available metrics better than U.S.

CDC PLACES modeled ZCTA-level estimates (adult prevalence).

Obesity

16.9%

U.S.

33.3%

Diabetes

13.2%

U.S.

12.0%

Current smoking

7.4%

U.S.

13.1%

Connectivity

3 of 3 metrics better than U.S.

Best available speed

1,000Mbps

Gigabit speeds reported

100+ Mbps coverage

99.6%

U.S.

85.3%

Gigabit ready

18.6%

U.S.

8.6%

5G available

91.0%

U.S.

77.4%

Learning

Education metrics come from ACS 5-year estimates for ZIP Code Tabulation Areas (ZCTAs).

Bachelor's degree+ (age 25+)

54.4%

U.S.

35.7%

A high share of adults with a bachelor's degree or higher often correlates with higher-paying jobs and knowledge-economy industries.

ZIP-level estimates can have higher margins of error than county/state totals; treat small differences as noise.

School districts

Walnut Valley Unified School District

Map

ZIP 91789

Walnut, CA

Population

40.3K

Area

15.9 sq mi

Density

2.5K/sq mi

Neighbors

917249174891765917689179191792
More Details

Census Tracts

12 tracts overlap this ZIP. Hover over segments to explore.

18%
12%
11%
10%
9%
+7

Tract 4033.27

18.3%

Tract 4034.07

11.5%

Tract 4034.09

11.4%

Tract 4034.03

9.5%

Tract 4087.07

8.7%

Others (7)

35.2%

Total tracts: 12Coverage: 94.6%

Representation

U.S. House

ZIP codes can span multiple congressional districts. Overlap percentages are approximate by land area. Verify by address.

97%

CA-38

97.3%

CA-35

1.7%

CA-31

1%

Districts: 3Coverage: 100.0%

Data freshness

ACS 5-Year
2020–2024
CDC PLACES
2025
Broadband
2020-12
Mobile
2025-11-24
Page Updated
2026-02-23

Release schedule and upstream dates: Sources.

Data sources

US Census Bureau (ACS 5-year)HUD USPS ZIP crosswalkUS Census TIGER/Line (geometry inputs)US Census TIGER/Line (school districts)US Census Bureau (ZCTA-to-tract relationship, 2020)US Census Bureau (2020 ZCTA-to-congressional-district relationship file, CD119)CDC PLACES (ZCTA)FCC (Form 477 broadband)FCC (Mobile Broadband Data Collection)

Derived statistics

  • ZIP pages use Census ZIP Code Tabulation Areas (ZCTAs), not USPS delivery routes.
  • Population density is computed as population ÷ land area.
  • Overlap percentages (tracts and districts) are derived from map geometry and are approximate.

Data accuracy & methodology

ZIP pages combine 2020–2024 ACS 5-year ZCTA estimates with other public datasets when available (see Sources). Connectivity metrics use FCC coverage data, not ACS. ZIP-level estimates can have higher margins of error than county/state totals; treat small differences as statistical noise rather than precise changes.