Neighbour's Room Deme House Parish Hall Community Centre
Of course, it will be recognised that the lay-out of each 'SMIC' on the ground would not reflect the near perfect shape of these diagrams for, in practice, this will depend on where each member takes up residence/is already living within 'Its Catchment Area.'
And so, without getting into a numbers game, it can be seen that, with each Set consisting, on average, of 7 adults, each Deme, on average, of about 50 adults and each Parish, on average, of about 350 adults, the population of each Community, on average, would be about 2500 adults, i.e. between about 500 and 4500 people. (See Dunbar's Number on: https://en.wikipedia.org/wiki/Dunbar's_number )