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ZIP Code Database - Facts & Stats

Data Last Updated: June 1, 2023

Zip Code 91789, Walnut, CA

ZIP Code 91789 Details

Zip Code:91789
State:CA [California]
Multi County:No
City Alias(es):Walnut
City Industry
City Of Industry
Diamond Bar
Area Code:909 / 840
City Type:P [Post Office]
Classification: [Non-Unique]
Time Zone:Pacific (GMT -08:00)
Observes Daylight Saving:Yes
Elevation:526 ft
State FIPS:06
County FIPS:037
Intro Date:<2004-10

ZIP Code 91789 2020 Census Demographics

Current Population:42,059
2020 Population:41,235
Households per ZIP Code:13,047
Average House Value:$790,500
Avg. Income Per Household:$116,583
Persons Per Household:3.16
White Population:5,426
Black Population:951
Hispanic Population:7,863
Asian Population:27,454
American Indian Population:189
Hawaiian Population:33
Other Population:3,319
Male Population:20,083
Female Population:21,152
Median Age:45.80 years
Male Median Age:43.10 years
Female Median Age:48.10 years

ZIP Code 91789 Other Demographics

# Residential Mailboxes:13,310
# Business Mailboxes:1,850
Total Delivery Receptacles:14,305
Number of Businesses:2283
1st Quarter Payroll:$279,885,000
Annual Payroll:$1,237,529,000
# of Employees:19,093
Water Area:0.051 sq mi
Land Area:15.867 sq mi
118th Congressional District:31|35|38
118th Congressional Land Area:218.24|168.88|101.46 sq mi
Single Family Delivery Units:6,827
Multi Family Delivery Units:243
# Residential Mailboxes:13,310
# Business Mailboxes:1,850
Total Delivery Receptacles:14,305

ZIP Code 91789 Social Security Benefits

  2018 2019 Delta
Total Beneficiaries: 7,495 7,805 +310
Retired Workers: 6,020 6,360 +340
Disabled Workers: 345 325 -20
Widow(er)s and Parents: 370 370 0
Spouses: 530 525 -5
Children: 230 225 -5
65+: 6,515 6,895 +380
Monthly Benefits - All: $10,346,000 $11,100,000 +$754,000
Monthly Benefits - Retired Workers: $8,760,000 $9,528,000 +$768,000
Monthly Benefits - Widow(ers): $476,000 $494,000 +$18,000

ZIP Code 91789 Statistical Areas

CBSA: 31080
CBSA Name: Los Angeles-Long Beach-Anaheim, CA
CBSA Type: Metro
CBSA Division: 31084
CBSA Division Name: Los Angeles-Long Beach-Glendale, CA
CBSA Population:0
CBSA Division Population:0
MSA: 4472
MSA Name: Los Angeles-Riverside-Orange County, CA
PMSA: 4480
PMSA Name: Los Angeles-Long Beach, CA PMSA
City State Key:Z23778
Preferred Last Line Key:Z23778
91788: Previous ZIP Code
Next ZIP Code: 91790


  1. U.S. Postal Service [Last Updated: 6/1/2023],
  2. Internal Data Creation [Last Updated: 6/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census American National Standards Institute (ANSI) [Last Updated: 6/1/2023],
  6. U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023],
  7. Centers for Medicare & Medicaid Services [Updated Yearly],