How large are these communities and what kinds of households live there?

Cohousing communities in North America range in size from 9 to 44 households. Each new community begins with assessing a property and sizing the project to balance development economies and social dynamics. Communities of this size are small enough so that you know all your neighbors by wave, but large enough to accommodate a diversity of people.
Cohousing attracts a wide range of household types: single people of all ages, couples and single parents of infants, toddlers and school-aged children, couples whose children are grown, young couples without children.