Adoption.com
A network of sites that include AdoptionRegistry.com,
a free service that claims to have almost 100,000 entries of people
looking for birth parents or children.
The-Seeker.com
Now one of the biggest site for family-hunting adoptees, it was started
as a general-purpose database to find lost loves and Army buddies.
FamilySearch.org 1880 Census data made freely available by the Church of the Latter Day
Saints