I think you're interpreting this graph iornrcectly: it refers to metro areas, which are hugely larger than cities. If they are using the OMB Statistical Areas, well, the Baltimore area includes Queen Annes County on the Maryland eastern shore, which is almost entirely rural. I would imagine that of the metro are parishes, maybe a third are actually in urban areas, another third are in the suburbs, and the remainder are in semi-rural or fully rural areas. In our case twenty-five of the hundred-odd parishes in the Diocese of Maryland are in Baltimore City, and after that it starts to be a game of what exactly is a city? with Cumberland (two parishes) Hagerstown, Frederick and Westminster (one parish each) probably counting. My own parish is metropolitan but is actually at a semi-rural crossroads a mile or so away from the tiny village that gives it its name; probably two-thirds of the membership could be described as suburban commuters of one sort or another with the rest either retirees, farmer/agricultural or rural professionals (e.g. doctors and private practice lawyers).Some of Kirk Hadaway's old material does divide up churches by community size; possibly he could be prevailed upon to join that with the membership data to give proportions of membership by his categories, which are quite a bit finer-grained than these BTW.