[MrE]

I just did the calculation based upon the information provided above by Jon ( I eliminated duplicates and Tom's Israel pin) and was surprised to find the average location works out to the very southwest corner of Kansas, not far from Liberal. Fascinating, further west and south than I would have imagined.

Jon,

I like your idea, I think if we only used locations for those planning on attending the rally we would have a fairly accurate representation of the center of the rally attendees universe. I dropped 10 rows trying to only give one location per member and came up with (37.83811355, -101.3367094) as the center of the Newell universe as we know it. You can cut and paste into Google Maps or Google Earth and see exactly where it is.