Zip Code: 21791 (Union Bridge, 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 21791 Zip Code in May 2020 was 25.997.

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 21791 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: 21791 - Market Hotness: Trend of Supply Score
Zip Code: 21791 - Market Hotness: Trend of Supply Score
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Month Supply Score
September 2017 89.16588566073102
October 2017 66.71020712819556
November 2017 64.88636363636363
December 2017 32.285953932511774
January 2018 26.66265623955618
May 2018 64.90856986899564
July 2018 25.156582940530768
August 2018 39.63336739908023
September 2018 77.0669540958661
October 2018 58.163650075414786
November 2018 35.32426447326795
December 2018 89.21228475970187
April 2019 37.52057048820625
May 2019 35.37078960005488
June 2019 21.717205674712567
July 2019 19.02234453836577
August 2019 31.459797033567526
September 2019 46.780119899439185
October 2019 58.15904983217144
November 2019 63.34461658638199
December 2019 49.06663123629841
January 2020 36.702944049113995
February 2020 22.214108368628597
June 2020 25.997145647111847