Here is an istat link to a geolocation data file which shows the boundaries of Italian comuni. I converted it to KML format and enhanced it with population data. I have removed the files for past years.
The KML file I created can be loaded into Google Earth Pro. This will show all the comuni boundaries and will also display the comune population. There is a link below which tells where I got the population data. The population data is current as of 2023-JAN-01.
The link below is for a file in KML format, which can be imported into Google Earth Pro. Or you can use any mapping software which supports KML files. I used Google Earth Pro version 7.3.6.9345 for MacOS, but I suspect it will work the same for Google Earth Pro on other platforms. Here is how to do that.
NOTE: In previous versions of Google Earth Pro I was able to use File—>Import to load KML files, but my current version of Google Earth Pro does not seem to allow that. It may work for you.
If you load both the region boundaries file and the municipal boundaries file, you will want to load the municipal boundaries file last, that is, after you load the region boundaries. You want the municipal boundaries on top so that when you click on them you get municipal information.
Now you can navigate around the map of Italy by scrolling and zooming in or out to find the comune of interest. Comune boundaries are outlined in red. When you click within the boundaries of a comune, a popup will appear with a table of information. The population (pop) entry is in the table just below the comune name. Here's how it looks in action:
Here is a video to show you how to use Google Earth Pro with the kml files listed below. The video has higher resolution than what is probably displayed on this web page in your browser. Right-click the video to download it and watch it in full resolution.
Note that some comune have two official names and both will be listed in the table. This is common in the Northern comuni where they often have both an Italian name (comune) and a Germanic name (comune_a).
Here is the KML file for 2023:
Here is the KML file for the region boundaries:
This could be a good resource when you are trying to figure out what comune governs a particular piece of real estate in Italy.
See also for information on the population of comuni in Italy.