Zip Code: 21104 (Marriottsville, MD) - 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 21104 Zip Code in May 2025 was 99.489.

You can see similar for other Maryland Zip Codes.

The chart and table below shows the trend of the market hotness: supply score for the 21104 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: 21104 - Market Hotness: Trend of Supply Score
Zip Code: 21104 - Market Hotness: Trend of Supply Score
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Month Supply Score
September 2017 71.32146204311152
October 2017 58.736082602475584
November 2017 34.53914141414142
December 2017 19.59481256855281
June 2018 80.95459682244234
July 2018 50.84909924452767
August 2018 80.32064384261625
September 2018 64.77935582044128
October 2018 67.23227752639518
November 2018 75.05219867130654
December 2018 54.638910305833974
January 2019 51.95387149917627
February 2019 30.677838060572764
March 2019 13.834430204364393
April 2019 55.95172792100932
May 2019 97.53721616244769
June 2019 92.14684327304512
July 2019 79.57538824454492
August 2019 66.90085870413739
September 2019 75.6011087475021
October 2019 87.78079008520527
November 2019 84.45514906913162
December 2019 63.81452202218827
July 2020 90.00850668935118
September 2020 15.38837721085663
June 2025 99.4889663182346