The Coalition for Marriage, Family and Couples Education is dedicated to making marriage education widely available. Diane Sollee is director.

Child Trends is a nonprofit, nonpartisan research center dedicated to improving children’s lives. One focus of its studies is marriage and family.

The American Association for Marriage and Family Therapy is the professional association for the field of marriage and family therapy. The organization represents the professional interests of more than 50,000 marriage and family therapists throughout the United States, Canada and abroad.

Unmarried Equality (originally the Alternatives to Marriage Project) is a nonprofit organization that advocates for equality and fairness for unmarried people. The organization, which is based in Brooklyn, N.Y., says it does not oppose marriage but wants validation and support, including nondiscriminatory public policies, for those who are single or in nonmarital relationships.

The Marriage & Religion Research Institute archives data about marriage from a number of sources. It also posts links to scholars around the country.

The National Conference of State Legislatures’ website includes a summary page on marriage.

St. John’s Community Development Corp., a project of St. John’s Baptist Church in Miami, to create affordable housing and offers home ownership counseling. It has created more than 40 homes and multifamily units.

The Elder Cohousing Network in Davis, Calif., an eight-household community, opened in January 2006 as the first elder cohousing development in the country. Members range in age from 76 to 92; the community grew out of a Unitarian Universalist congregation in Davis.

Mustard Seed Associates in Seattle is a network for Christians interested in cultural innovation. It is a resource for information about cohousing.