Zip Code: 90603 (Whittier, CA) - Market Hotness: Trend of Supply Score (Realtor)
Updated on March 13, 2026.

According to data from Realtor.com, the market hotness: supply score for the 90603 Zip Code in August 2025 was 59.23.

You can see similar for other California Zip Codes.

The chart and table below shows the trend of the market hotness: supply score for the 90603 zip code.

Note: Supply Score is an index representing the metro's median days on market ranking compared to other metros.

Data Source: Realtor.
Zip Code: 90603 - Market Hotness: Trend of Supply Score
Zip Code: 90603 - Market Hotness: Trend of Supply Score
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Month Supply Score
September 2017 97.65698219306466
October 2017 87.23642470610189
November 2017 98.33964646464646
December 2017 96.43847990192916
January 2018 94.7931288015507
February 2018 97.64550632032226
April 2018 98.24087540688413
May 2018 91.43695414847161
June 2018 94.11686498703716
July 2018 92.78104216439594
August 2018 90.02938170669393
September 2018 90.44509256910982
October 2018 82.81799899446959
November 2018 82.57513445112306
December 2018 98.14957594448728
January 2019 87.50576606260296
February 2019 98.41357049653183
March 2019 98.57984066505023
April 2019 97.09956116291826
May 2019 88.85230157096797
June 2019 83.01620385934243
July 2019 86.06251228621977
August 2019 87.51626333593546
September 2019 85.48314317024432
October 2019 94.82313452104312
November 2019 95.85340450462179
December 2019 97.99375539759517
March 2020 95.04229496138285
July 2020 95.52238805970148
July 2021 62.39022913091753
August 2021 54.26880811496196
September 2021 34.98406918525262
June 2022 81.17111524932754
July 2022 35.926646290636285
August 2022 83.08126121507306
September 2022 63.721440013489584
October 2022 57.391893035457386
November 2022 38.549904270373766
December 2022 67.42507852958656
January 2023 71.01049635296211
February 2023 74.50397776286782
March 2023 73.56010435480634
August 2024 87.87051168768576
September 2024 89.35738268134614
October 2024 56.69611986169804
November 2024 61.444120803311364
December 2024 73.42220852277106
January 2025 87.8777923784494
February 2025 85.53253674890398
March 2025 86.44170190730992
April 2025 62.651311365164766
May 2025 58.431085043988276
June 2025 70.12001548586915
July 2025 83.95219482862298
August 2025 64.69239869860988
September 2025 59.23049001814882