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Housing Inventory: New Listing Count Year-Over-Year in Williamson County, IL (NEWLISCOUYY17199)

Observations

May 2026: 34.78
Updated: Jun 4, 2026 2:49 PM CDT
May 2026:  34.78  
Apr 2026:  6.06  
Mar 2026:  -1.92  
Feb 2026:  42.86  
Jan 2026:  -4.76  

Units:

Percent,
Not Seasonally Adjusted

Frequency:

Monthly

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Notes

Title Release Dates
Housing Inventory: New Listing Count Year-Over-Year in Williamson County, IL 2020-03-05 2026-06-03
 
Source    
Realtor.com 2020-03-05 2026-06-03
 
Release    
Housing Inventory Core Metrics 2020-03-05 2026-06-03
 
Units    
Percent 2020-03-05 2026-06-03
 
Frequency    
Monthly 2020-03-05 2026-06-03
 
Seasonal Adjustment    
Not Seasonally Adjusted 2020-03-05 2026-06-03
 
Notes    
The count of new listings added to the market in a given geography during the month.

2020-03-05 2021-12-01
The count of new listings added to the market in a given geography during the month.

With the release of its November 2021 housing trends report, Realtor.com® incorporated a new and improved methodology for capturing and reporting housing inventory trends and metrics. The new methodology uses the latest and most accurate data mapping of listing statuses to yield a cleaner and more consistent measurement of active listings at both the national and local level. The methodology has also been adjusted to better account for missing data in some fields including square footage. Most areas across the country will see minor changes with a smaller handful of areas seeing larger updates. As a result of these changes, the data released since December 2021 will not be directly comparable with previous data releases (files downloaded before December 2021) and Realtor.com® economics blog posts. However, future data releases, including historical data, will consistently apply the new methodology. More details are available at the source's Real Estate Data Library (https://www.realtor.com/research/data/).

2021-12-02 2022-09-28
The count of new listings added to the market in a given geography during the month.

With the release of its September 2022 housing trends report, Realtor.com® incorporated a new and improved methodology for capturing and reporting housing inventory trends and metrics. The new methodology updates and improves the calculation of time on market and improves handling of duplicate listings. Most areas across the country will see minor changes with a smaller handful of areas seeing larger updates. As a result of these changes, the data released since October 2022 will not be directly comparable with previous data releases (files downloaded before October 2022) and Realtor.com® economics blog posts. However, future data releases, including historical data, will consistently apply the new methodology. More details are available at the source's Real Estate Data Library (https://www.realtor.com/research/data/).

With the release of its November 2021 housing trends report, Realtor.com® incorporated a new and improved methodology for capturing and reporting housing inventory trends and metrics. The new methodology uses the latest and most accurate data mapping of listing statuses to yield a cleaner and more consistent measurement of active listings at both the national and local level. The methodology has also been adjusted to better account for missing data in some fields including square footage. Most areas across the country will see minor changes with a smaller handful of areas seeing larger updates. As a result of these changes, the data released since December 2021 will not be directly comparable with previous data releases (files downloaded before December 2021) and Realtor.com® economics blog posts. However, future data releases, including historical data, will consistently apply the new methodology. More details are available at the source's Real Estate Data Library (https://www.realtor.com/research/data/).

2022-09-29 2026-06-03

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Williamson County, IL Illinois New Listing Realtor.com County or County Equivalent Copyrighted: Citation Required Monthly United States of America Not Seasonally Adjusted