The file appears to be .gdb, and you can download it here. https://lacounty.maps.arcgis.com/home/item.html?id=cdd4c011519849caa62286044f1d31c9

I had tried to import into JOSM as well, but either I did it wrong or it doesn’t support that format. It would be greatly appreciated if you could show me how to do things properly.

Indeed, there was no download. I copied data directly from the interactive site. After searching, I’ve indeed found downloadable data on the county level. My only issue now is that I can’t find any reasonable way to convert the data. All of the Python scripts I’ve attempted to download don’t work, and there are no online tools that I know of, so for the time being I’m at a roadblock until I can get help.

Hey n76! I actually don’t know what format that is in. I’ve just been using the web UI to look at addresses and copy them. I was also looking at conflation, but I don’t know how to download this data from this site.