The property at 20543 Summertown Street, Walnut, CA 91789, built in 1972, is a 2,805 square foot Single Family and has 5 bedrooms and 3 bathrooms. It is situated on a lot that is 9,289 square feet and was last tax assessed in 2025 for a valuation of $0
The estimate for this property has experienced a 2.99% increase in the past 6 months reaching a value of $1,408,337.
Property Tax History
Source: Public Records
| Year | Assessment |
|---|---|
| 2023 | $1,279,794 +52.76% |
| 2022 | $837,805 +2.00% |
| 2021 | $821,378 |
| 2020 | $821,378 +1.04% |
| 2019 | $812,956 +2.00% |
| 2018 | $797,016 +2.00% |
| 2017 | $781,389 +4.04% |
| 2016 | $751,048 +1.52% |
| 2015 | $739,767 +2.00% |
| 2013 | $725,277 |
Valuation History
Source: Public Records
| Month | Valuation | Single Family Homes Sold | Median Sales Price/Sqft |
|---|---|---|---|
| Nov 2025 | $1,408,337 | - | - |
| Oct 2025 | $1,430,870 | - | - |
| Sep 2025 | $1,434,698 | - | - |
| Aug 2025 | $1,428,723 | - | - |
| Jul 2025 | $1,427,999 | - | - |
| Jun 2025 | $1,386,767 | - | - |
| May 2025 | $1,365,644 | - | - |
| Apr 2025 | $1,367,446 | - | - |
| Mar 2025 | $1,377,868 | - | - |
| Feb 2025 | $1,389,221 | - | - |
| Jan 2025 | $1,361,404 | - | - |
| Dec 2024 | $1,353,777 | - | - |
| Nov 2024 | $1,349,642 | - | - |
| Oct 2024 | $1,329,686 | - | - |
| Sep 2024 | $1,324,506 | - | - |
| Aug 2024 | $1,327,593 | - | - |
| Jul 2024 | $1,333,329 | - | - |
| Jun 2024 | $1,248,699 | - | - |
| May 2024 | $1,225,178 | - | - |
| Mar 2024 | $1,181,249 | - | - |
| Feb 2024 | $1,081,399 | - | - |
| Jan 2024 | $1,112,991 | - | - |
| Dec 2023 | $1,151,847 | - | - |
| Nov 2023 | $1,141,701 | - | - |
| Oct 2023 | $1,138,472 | - | - |
| Sep 2023 | $1,266,000 | - | - |
| Aug 2023 | $1,326,000 | - | - |
| Jul 2023 | $1,371,000 | - | - |
| Jun 2023 | $1,289,000 | - | - |
| May 2023 | $1,325,000 | - | - |
| Apr 2023 | $1,351,000 | - | - |
| Mar 2023 | $1,308,000 | - | - |
| Feb 2023 | $1,284,000 | - | - |
| Jan 2023 | $1,344,000 | - | - |
*Market History, including Median Sales Price per square foot, and Single Family Homes Sold is based on historical data of Zip Code: 91789 - CA
Population & Environment
Source: Sperling's Best Places
| Zip | City | County | National | |
|---|---|---|---|---|
| Population | 44,359 | 30,445 | 10,113,180 | 335,858,263 |
| Population Density | 2,834 | 3,386 | 2,492 | 95 |
| People per Household | 3.3 | 3.4 | 3 | 2.6 |
| Median Age | 43.2 | 43.9 | 37.8 | 39.1 |
| Median Income | $104,309 | $110,009 | $73,262 | $66,222 |
| Average Income | $38,801 | $39,525 | $35,221 | $35,475 |
| Cost of Living Index | 150 | 155 | 124 | 100 |
| Zip | City | County | National | |
|---|---|---|---|---|
| January Avg. High Temp | 41.5°F | 41.5°F | 48.5°F | 22.6°F |
| July Avg. High Temp | 88.7°F | 88.7°F | 83.8°F | 86.2°F |
| Annual Precipitation | 16.98" | 16.98" | 15.14" | 38" |
Click Zestimate price to view details on Zillow. Zestimate data is provided "as is" via the Zestimate API. © Zillow, Inc., 2006-2022. Use is subject to Terms of Use.
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