ZIP 91789
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12-month history
Last updated: October 17, 2026
What the numbers show
Rent in ZIP 91789 is 0.3% below its high of $3,900 in July 2026, at $3,890 as of September 2026.
Rent in ZIP 91789 changed +2.8% over the year to September 2026. Across the 819 California ZIP codes Zillow tracks, the typical change was +3.2%.
Rent has fallen 2 months in a row, and rose in 5 of the last 12 months.
30% of the median household income ($125,720) is $3,143 a month. That covers HUD's Fair Market Rent for up to a 1-bedroom ($3,110); a 2-bedroom is $3,880.
ZIP 91792, 3 miles away, rents for 39% less ($2,379/mo), about $18,100 a year in savings.
From Zillow's monthly rent index (ZORI) for ZIP 91789. Income is the Census median household income (5-year estimates). Fair Market Rents are HUD’s, which include utilities.
Who lives here
ZIP 91789 (Walnut, CA) is majority owner-occupied, has a large retiree population, has a median income above the national average, 54.4% of residents hold a bachelor's degree or higher.
Source: U.S. Census Bureau · ACS 2024 5-Year Estimates
How ZIP 91789 in Walnut, CA has changed in 5 years
Across the past five years, the going rent in ZIP 91789 in Walnut, CA has shifted from $3,409 to $3,890, up 14.1% since 2023. Census figures show median household income at $125,720 today, compared with $116,583 five years earlier. Because rent grew faster than wages over the same span, the affordability picture has tightened relative to 2021. Census counts show ZIP 91789 in Walnut, CA losing about 1,531 residents over the five-year window, down 3.7% on net. The combined trend lines point to a market that has changed measurably from where it stood in early 2023.
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Tips for renters in ZIP 91789
Last updated: October 17, 2026
ZIP code 91789 covers Walnut, CA. The median rent here is $3,890/mo as of October 2026. A 1-bedroom rents for a median of $3,110/mo. A 2-bedroom rents for a median of $3,880/mo.
At 37% of local median household income ($125,720/yr), ZIP 91789 ranks as moderate compared to the national benchmark of 30%. Rents have increased 2.8% over the past year.
Frequently asked questions
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How does ZIP 91789 compare to other ZIPs in California?
At $3,890/mo, rent takes ~37% of ZIP 91789's median household income ($125,720/yr). The standard benchmark is 30%.
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