If you want full accuracy, you would need to install geo-tracking software on their 'phones, and in most countries, obtain explicit written consent to track people.
If you're content with attempts at geo-tracking on the server side, you'll need to find a power-up that can hook into a geo-location service and try to report where the phone is when it connects to Trello.
This is remarkably unreliable and becoming more so as people become more security and privacy conscious - vpns, onion routers and so-on easily break it. (With unreliable, when I first worked for a place that was trying to do it, they were having problems with people in the UK appearing to be in Germany because they were using the wifi on their train. This sort of problem is still endemic, and again, becoming more and more common)
I'm not aware of any power-up that does this either.
@Travis Jones you can use location tracking with IFTTT, but it's not like "tell me where everyone is right now", it's more like "tell me when someone leaves or arrives at some location". So you would have to set up geofences that trigger the automation to run, which could be recorded in Trello.
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