Zip Code: 18109 (Allentown, PA) - Market Hotness: Trend of Hotness Rank (Realtor)
Updated on March 13, 2026.

According to data from Realtor.com, the hotness rank for the 18109 Zip Code in October 2025 was 1,727. The year over year change (YoY) was 1,104.

You can see similar for other Pennsylvania Zip Codes.

The chart below shows the trend of the hotness rank for the 18109 zip code. The table below shows the trend, and the YoY changes.

Note: Hotness rank refers to the rank by hotness score. A rank value of 1 is considered the hottest (highest Hotness score).

Data Source: Realtor.
Zip Code: 18109 - Market Hotness: Trend of Hotness Rank
Zip Code: 18109 - Market Hotness: Trend of Hotness Rank
Items per page:
1 – 10 of 50
Month Hotness Rank YoY Change
September 2017 6314
October 2017 5301
November 2017 1662
December 2017 3711
January 2018 2169
February 2018 4575
March 2018 2269
April 2018 2580
May 2018 5773
June 2018 1368
July 2018 2988
August 2018 2202
September 2018 3831 -2,483
October 2018 3498 -1,803
November 2018 3056 1,394
December 2018 4538 827
January 2019 1553 -616
February 2019 1809 -2,766
March 2019 3192 923
April 2019 1552 -1,028
May 2019 704 -5,069
June 2019 1733 365
July 2019 2013 -975
August 2019 3169 967
September 2019 3736 -95
October 2019 6430 2,932
November 2019 7041 3,985
December 2019 3654 -884
January 2020 3034 1,481
February 2020 2433 624
March 2020 909 -2,283
April 2020 2229 677
May 2020 5317 4,613
June 2020 6010 4,277
November 2020 757 -6,284
December 2020 1002 -2,652
July 2021 804
July 2022 2312 1,508
August 2022 2766
September 2022 1561
October 2022 1192
November 2022 2602
December 2022 3664
September 2024 884
November 2024 623
December 2024 532
January 2025 790
September 2025 2164 1,280
October 2025 734
November 2025 1727 1,104