the city itself seems to want you to fill out a disclaimer form before they will e-mail you the city boundaries. that seems unnecessarily complicated.
you can get the city boundaries from the Census, too, though you have to pull out the specific polygon for the city yourself.
i went ahead and did that, and below is the text that comprises the KML. copy the text, paste it into a plain text editor (like Notepad, if you’re using Windows), and save the file with a .KML extension. then go to create a place in iNaturalist, and load the KML file.
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