The population of the eastern mound has been estimated to be, at maximum, 10,000 people, but the population likely varied over the community's history. An average population of between 5,000 and 7,000 is a reasonable estimate. The sites were set up as large numbers of buildings clustered together. Households looked to their neighbors for help, trade, and possible marriage for their children. The inhabitants lived in mudbrick houses that were crammed together in an aggregate structure. No footpaths or streets were used between the dwellings, which were clustered in a honeycomb-like maze. Most were accessed by holes in the ceiling and doors on the side of the houses, with doors reached by ladders and stairs. The rooftops were effectively streets. The ceiling openings also served as the only source of ventilation, allowing smoke from the houses' open hearths and ovens to escape.