One resource is IPMS/USA, though there are clubs that aren't part of IPMS, too. But IPMS has a chapter finder at its website, and for their region that includes Kansas City, Kansas (as well as MO), this page shows a list of existing clubs:
https://calendar.ipmsusa3.org/region/region-14-mid-central
For finding clubs that aren't part of IPMS' organization, you can run some searches as you said. Also, if there are any hobby shops around, you can ask there if they know of any clubs or even just groups that get together. I know that here in my home area, the Lehigh Valley, PA, there are groups like that. Some meet at hobby shops-that's how our Lehigh Valley Scale Modelers started, for example-so it pays to ask around.
I hope you find some folks in your area, because it's fun to get together in person with others in the hobby.
Best regards,
Brad