Check for non-existent communities, and move entries under them to the appropriate community. Then delete the non-existent one.
e.g., Say that three places in
Tavares, Florida are listed under Tavarcs, which does not exist. Those three should be moved under Tavares, then Tavarcs should be removed.
In some cases, a structure or vessel has been moved since it was listed on the National Register. These should be listed under their current location, with information about their prior location(s).
The /coords items are intended as sandboxes; when you merge coordinates for a state or county to an article please delete them. Those lists are too large to display correctly but smaller pieces will work.