I strongly suggest finding neighbors with whom you can get along for your group. For all the reasons mentioned here, groups from further away have difficulty getting together in good times. Imagine trying to get together if society devolves and travel is dangerous.
Keep in mind, everyone doesn’t have to be a prepper in the typical sense of the word. In my new neighborhood, I’ve been scoping out the folks on my street. There is a cop 3 doors down (he will know guns), right next door is a lady with chickens and water carchment, and behind us is somebody with fruit trees. Will we be able to work together? That remains to be seen. But it’s a starting point.
Try not to narrow your vision of a group only to other preppers. Look for
People nearby with skills and assets.