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I am working with the 2022 QCT dataset and have encountered some inconsistencies between 1.) HUD's list of QCTs, 2.) HUD's locator webmap (https://www.huduser.gov/portal/sadda/sadda_qct.html), and 3.) the downloadable Geocoded dBase file (https://www.huduser.gov/portal/datasets/qct.html). For example, tract # 17031310800 is not on HUD's list of QCTs, nor in the webmap, but does show up in the geocoded dBase file; tract # 17031530600 shows up in geocoded dBase file but not on list.

Has anyone else encountered these or similar issues? Is there a master list or dataset that should be used as main reference?

I confirmed that tract #17031310800, which brings up a location in Cook County, Illinois, is on the webmap, and that that particular tract number does not appear in the Geocoded dBase file (https://www.huduser.gov/portal/datasets/...022CSV.zip). However, the tract number (3108.00, not the full tract number) does show up in the Geocoded dBase file. The corresponding "qtc_id" is 48201310800. If you search for "3108.00" in the HUD list of the QCT's (https://www.huduser.gov/portal/Datasets/...T2022M.PDF), you will get two results, none of which are found in Illinois.
You might try this HUDuser page: https://www.huduser.gov/portal/qct/index.html

Good Afternoon,

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We have looked into the issue you were encountering. The reason you are unable to find the specific tract in the lists you provided is because the tract is not considered a qualified census tract (QCT). You will notice on the mapping tool, that although the tract appears, it is not colored in, and is therefore not marked as a QCT.

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