The List of Jewish communities in North America was designed to list yeshivot, Hebrew schools and synagogues. I have no idea why that criteria was chosen. In practice it seems that the entries have no criteria whatsoever. A list like that doesn't belong in any encyclopedia. As unworldly as it is now, we can just imagine how it would look if it were to be factually comprehensive. We need to break down "Jewish Communities" into lists with more specified criterias. 

 This list - being something that technically doesn't belong in the List of Jewish communities in North America (because a Kollel is not a yeshivot, Hebrew schools or a  synagogue) - is a great start to more useable and specific list of "Jewish Communities".