The Buddhist concept of "community" depends always on a larger context. For most, there is a fairly identifiable 'spiritual community' consisting of those individuals that one meets with regularly and whom share common spiritual ideals. There is also an everpresent physical community, consisting of our neighborhood, section of town, or whole city. On a more metaphysical note, there is the sentient community: every living being capable of experiencing suffering.
A great deal of Buddhist teaching deals with breaking the individual out of an ego-based state of mind into one that recognizes the 'non-duality of existance'. This non-duality can be made clearer by thinking of [finish me later]