Silver Sage Village in Boulder, Colo., broke ground in August 2006 and is Colorado’s first cohousing development for seniors. With a spiritual core, the ecofriendly community has a common meditation room.

Sand River Cohousing is a 26-family community of elders developed in Santa Fe, N.M., based on shared values, including spiritual growth. Contact Coreen Plewa.

The Oakcreek Cohousing Community was completed in 2012 and is run and staffed by the community members themselves. It houses seniors in its 24 units and works to create an interdependent, supportive community. It is located in Stillwater, Oklahoma.

Arboretum Cohousing is a 40-unit development in Madison, Wis. It includes affordable housing through Habitat for Humanity of Dane County.

The Tuscaloosa Cooperative Association, in Tuscaloosa, Ala., is a new group exploring environmentally sustainable cohousing for the area. Charles Nuckolls, a professor of anthropology at the University of Alabama, says the group would like to create an American village.

Orange Twin Conservation Community is a developing eco-village that grows from a record label in Athens, Ga.

Giles Blunden is a Carrboro, N.C., architect who does green building and cohousing. He designed the 46-home Pacifica Cohousing, incorporating environmental and community values, also in Carrboro.

Nubanusit Neighborhood & Farm in Peterborough, N.H., is a 29-unit cohousing community based on environmental values that includes an organic farm.

Dr. J. Cameron Muir is president of the American Academy of Hospice and Palliative Medicine, which issued a position statement on Feb. 14, 2007, on “physician-assisted death.”